PLATE 36. 
1 a - p . Trematospira globosa. 
1 a - e. Dorsal, profile, and front views of young individuals. 
1 /- k. Individuals of larger size. 
1 / - p. Individuals of full size, showing some differences in the plications and in the eleva¬ 
tion of the beak. 
. 2 a - t . Trematospira Formosa. 
2 a - e. Young shells of this species, the plications fine and equal. The foramen is represented 
as extended below the beak, and having a triangular form from the absence of the del- 
tidium : this, however, is an accidental condition, as the young shells frequently preserve 
the deltidium entire, and present the round perforation as in the beak of old shells. 
2 /. An individual having strong angular strire more like the preceding species, hut with the 
elongate form and narrow beak characteristic of this one. 
2 g - k. Dorsal, profile, and front views of specimens of the ordinary size. 
2 l - t. Individuals of larger size and very symmetrical form. 
.3 a - g . Trematospira deweyi. 
3 a, b, c, d. Dorsal, ventral, profile, and front views of a very perfect specimen of medium size. 
3 e. /, g. Ventral, dorsal, and profile views of a larger specimen, the sides of which slope more 
rapidly from the beak. 
or explanations of Trematospira rcctirostra, see Plate xcv a. 
