Alaska: Crustaceans

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Doubleday, Page, 1910 - Alaska
 

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Page 297 - Synopsis of the Marine Invertebrata of Grand Manan : or the region about the mouth of the Bay of Fundy, New Brunswick.
Page 224 - The description of this form is given in the following concise manner: Head a little transverse, narrower than the body. Upper antenna not reaching to the extremity of the peduncle of the lower. Flagellum of lower antenna longer than its peduncle. Body narrow in front, gradually increasing in width toward the tail. Peduncle of caudal appendages more than half the length of the terminal filaments. Length six-twentieths inch.
Page 220 - Uteri and projecting far in front of the anterior margin of the head, while in S. consolidata they are small (Stimpson speaks of them as being minute), are not hooked, and do not project any considerable distance in front of the anterior margin of the head: in the greater size of the two median tubercles on the anterior division of the head (Stimpson does not mention these tubercles in his description, but in the specimens sent to the US National Museum from 0 6 Pacific Grove, California, by Mr.
Page 218 - VARIATIONS IN FORM. extend three-fourths the length of the segment; those of the last two segments extend the entire length of the segment. The abdomen consists of three distinct segments, with suture lines on either side of another partly coalesced segment. The third or terminal segment has subparallel sides to about the middle, where the segment gradually becomes narrower to a truncate extremity. On the posterior margin of the terminal segment is a faint indication of a double emargination on either...
Page 227 - Body covered with low tubercles. Color, light brown. Head with sides produced at the anterolateral angles in large lobes; front triangularly produced with a slight emargination at the apex of the triangle. Eyes situated on the lateral margins at the base of the antero-lateral lobes; they are small and black and apparently simple in structure. The peduncle of the antenna...
Page 225 - ... lateral margins straight, with a small lobe on either side near the base of the head. Eyes lateral, situated in the median transverse line. First pair of antennae reach the extremity of the peduncle of the second pair of antennae ; flagellum contains about ten joints.
Page 215 - ... processes in the first three segments; those of the following segments are more nearly regular in outline. The abdomen is somewhat broader than the thorax, although this expansion of the abdomen does not show in a dorsal view. The first segment is about equal in length to the last thoracic segment, and is marked on either side by two suture lines, indicative of coalesced segments. The terminal segment is entire and not produced, being evenly rounded in outline. The anterior portion of the segment...
Page 223 - The terminal segment is rounded posteriorly with smooth margins and a median lobe between the uropoda. Uropoda very short, about half as long as the terminal segment. Branches about equal in length, and twice as long as the peduncle. Legs simple, ambulatory, similar in shape and size, and biunguiculate. Only two good specimens, both females, were taken at Sausalito, California, by Dr. Ritter and party. Two imperfect specimens also are from the same locality. Until now the only other known species...
Page 222 - Posterior margin produced in three lobes, two lateral lobes, one on either side of a broadly rounded median lobe; the two lateral lobes are acute. The uropoda are short, not longer than half the length of the terminal segment of the body; the basal segment is broad, quadrate in shape, and shorter than either branch; the inner branch is somewhat longer than the outer one. The middle piece of the operculum in the male is very similar to the figure given by Sarsa of the type species of the genus, Janiropsis...

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