Sagamiwan San Unirui |
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Page 141
... broad , heart - shaped , distinctly notched at the anterior end . The frontal ambulacrum is shallowly grooved . The posterior interambulacrum is slightly raised but not keeled . The posterior end is fairly strongly concave , the lower ...
... broad , heart - shaped , distinctly notched at the anterior end . The frontal ambulacrum is shallowly grooved . The posterior interambulacrum is slightly raised but not keeled . The posterior end is fairly strongly concave , the lower ...
Page 164
... broad , narrowing posteriorly . The frontal ambulacrum and the adjacent part of the interambulacra are scarcely raised , the former being very shallowly grooved . The anterior end is shallowly notched . The posterior end is fairly ...
... broad , narrowing posteriorly . The frontal ambulacrum and the adjacent part of the interambulacra are scarcely raised , the former being very shallowly grooved . The anterior end is shallowly notched . The posterior end is fairly ...
Page 173
... broad , heart - shaped . The frontal ambulacrum is shallowly grooved , the anterior end being moderately notched . The antero - lateral parts of the petals and the adjoining interambulacral walls are broadly concave forming conspicuous ...
... broad , heart - shaped . The frontal ambulacrum is shallowly grooved , the anterior end being moderately notched . The antero - lateral parts of the petals and the adjoining interambulacral walls are broadly concave forming conspicuous ...