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abdomen Acad alga American anatomy Andrenidae animal appears basal birds body bones botany branch Bulletin Carapace cardinal vein cells character collection color common iliac vein condition cones connection Crustacea described diameter disk dorsal Eciton eggs elongate embryo Eremobates external eyes fauna female Fish Commission flagellum flowers frog fungus genera Genus gills gland gonidia granules head inner insects intercentra intestine joint Journ laboratory Lake larvae lateral legs length limbs male margin maxillipeds median ment Mosasaurs Museum Natural History neurone neurone theory neuropile normal North Notes observed organs paper Pelomyxas plants plates portion posterior present Proc Professor protoplasm pseudopodia Rathbun region side species specimens spines starfish Stimpson stolon structure suckers surface tadpoles tentacles Terminal segment thorax tion tissue U. S. Fish uropoda valve variation vein ventral vertebrates villi Zapus Zool zoology
Page 75 - The Cretaceous formation of the Black Hills as indicated by the fossil plants (with the collaboration of WP Jenney, WM Fontaine, and FH Knowlton).
Page 571 - ... at least a cubic yard in bulk, and contained hundreds of thousands of individuals, although many columns were outside, some bringing in the pupae of ants, others the legs and dissected bodies of various insects. I was surprised to see* in this living nest tubular passages leading down to the centre of the mass, kept open just as if it had been formed of inorganic materials. Down these holes the ants who were bringing in booty passed with their prey. I thrust a long stick down to the centre of...
Page 570 - Such a column is of enormous length, and contains many thousands if not millions of individuals. I have sometimes followed them up for two or three hundred yards without getting to the end. They make their temporary habitations in hollow trees, and sometimes underneath large fallen trunks that offer suitable hollows. A nest that I came across in the latter situation was open at one side. The ants were clustered together in a dense mass, like a great swarm of bees, hanging from the roof, but reaching...
Page 441 - ... old, migration could become in time a ruling Habit in the life of a last summer's bird, holding it true to route and period of movement. In short, it is believed that the causes of migration are simple facts and not impenetrable mysteries lying beyond the domain of scientific enquiry. Summary. — To sum up the whole matter in a single sentence : It is held that bird migration is a habit evolved by education and inheritance which owe their origin and perpetuation to winter with its failure of...
Page 804 - Mr. WA Cannon,* in discussing a Cecidomyid gall on the Monterey pine, says that the "larvae take their food only by absorption through the surface of the body...
Page 201 - Maine.) TYPE LOCALITY. — Hudson Bay. RANGE. — From the southern shores of Hudson Bay south to New Jersey, and in the mountains to North Carolina, west to Iowa and Missouri, and northwest to Alaska.
Page 87 - The Latimer Collection of Antiquities from Porto Rico, in the National Museum at Washington, DC By OTIS T.
Page 123 - ... the trunk which has hence been designated the branchiogenital region. A theory of gill-slits was developed, according to which gillslits arose in the interannular depressions while the gonads were disposed in zones corresponding with the epidermal annulations. The primary function of the gill-slits was the oxygenation of the gonads, their secondary function being the respiration of the individual.
Page 245 - ... consortia, that it is more convenient to treat them as a separate class. In the formation of the thallus the algal cells become enveloped by the mycelium of the fungus in a felted tissue of hyph;e (Fig.
Page 210 - ... carpus attenuated, hand very large, oblong, finger elongate and curved, immovable, strongly tuberculate within. Thoracic appendages not specialized into an anterior and a posterior series. Marsupium of female formed of eight large lamellae from the four first free segments.