PLATE 36. 



Page 



Fig. I a - p. Trematospira olobosa. 215 



I a - e. Dorsal, profile, and front views of young individuals. 



1 /- fc. Individuals of larger size. 



I I - p. Individuals of full size, showing some differences in the plications and in the eleva- 

 tion of the beak. 



Fig. 2 a - 1. Trematospira Formosa. * 215 



2 o - 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 stria) more like the preceding species, but with the 

 elongate form and narrow beak characteristic of this one. 



2 g - fc. Dorsal, profile, and front views of specimens of the ordinary size. 



2 I - t. Individuals of larger size and very symmetrical form. 



Fig. B a - g. Trematospira deweyi. 216 



3 a, b, c, d. Dorsal, ventral, profile, and front views of a very perfect specimen of medium size. 



8 c, /, g. Ventral, dorsal, and profile views of a larger specimen, the sides of which slope more 

 rapidly from the beak. 



Vor explanations of Trematospira rectirostra, see Plate xcv a. 



