398 PROCEEDINGS OF THE ACADEMY OF [PaRT II 



Vitrinella (Solariorbis) amosbrowni n. sp. Plate XXXVII, figs. 4, 4a. 



The shell is perforate, conic, of 4| rather rapidly increasing, mod- 

 erately convex whorls, the earlier ones smooth, the penult showing 

 some weak spirals above the suture, the last whorl having about 

 five weak well-spaced spiral cords in the peripheral region, a few 

 still weaker ones traceable above them, and about five smaller, 

 closer spirals below them, occupying all but the central region of 

 the base. Under the compound microscope the surface between 

 the spirals appears densely, irregularly pitted or granose. In the 

 middle part of the base it is finely radially striate and granose. The 

 aperture is somewhat squarish in front view, oblique; the basal lip 

 arches forward a little in a basal view. The peristome is thickened 

 within, the columellar margin strongly so. 



Alt. 1, diam. 1.55 mm. 



Type no. 4059 A. N. S. P. 



Teinostoma angulatum (Gabb) Plate XXXVII, figs, l, la, lb. 



Cyclops angidatus Gabb, Tr. Amer. Philos. Soc, xv, 1873, p. 214, 



The last whorl does not cover the spire completely, as a segment 

 of the suture is exposed, and the rest is visible through the trans- 

 parent last whorl. There seem to be about 2^ whorls. In the last 

 whorl the suture leaves its former course at a right angle and de- 

 scribes a semicircle to the periphery. The last whorl is angular 

 peripherally in front, but becomes rounded at the end. The dome- 

 like upper surface is covered with very fine spiral striae. The axial 

 callus is large, and formed as in Umhonium or Helicina. 



Alt 1.7, diam. 3.7 mm. 



Type no. 2837 A. N. S. P. 



This species and the next belong to a section of Teinostoma which 

 may be called Idioraphe, type T. angulatum, characterized by having 

 the whorls enveloping, the suture at first closely coiled, but in the 

 last whorl deviating abruptly. T. cryptospira Verrill is an allied 

 recent species. T. sandomingensis, which we have not seen, is pro- 

 bably near T. angulatum. 



Teinostoma depressum (Gabb) Plate XXXVII, figs. 2, 2a, 2b. 

 Cyclops dejyressa Gabb, Tr. Amer. Philos. Soc, xv, p. 214. 



In this tiny species the tip of the spire is exposed, the periphery 

 is rounded, and there are no spiral striae. 

 Alt. 0.65, diam. 1.3 mm. 

 The single example no. 2830 A. N. S. P., is probably not adult. 



