138 K.J. Bush — Marine Gastropods referred to 



1885), a very small species from off Brazil, in 675 fathoms, and 

 Adeorhis sincera Dall (Proc. U. S. Nat. Mus. xii, p. 338, pi. xii, f. 2, 

 1889), from off Florida and Brazil, in 294 and 391 fathoms, have 

 several features in common with the above deeper water form and 

 can doubtless be referred to the same genus. 



Tj^pe, MoUeriopsis abyssicola sp. nov. 

 Figures 6, 7. 



One dead, imperfect specimen (No. 52496), station 2572, N. lat. 

 40° 29', W. long. 66° 04', in 1769 fathoms, 1885. 



Shell small, opaque white, under a golden brown 

 epidermis, of few convex whorls (the tip is broken 

 away) forming a well-elevated spire and large body- 

 whorl. Surface lustrous where rubbed, ornamented 

 with a single conspicuous carina which defines a 

 broad, flattened sutural area and makes the whorls 

 Fig. 7. slightly angulated. This is roughened by the cross- 



ing of the growth lines, which are elsewhere incon- 

 spicuous. On the base surrounding the umbilicus 

 there are also four more prominent carina, about 

 equal in size and evenly separated by wide, slightly 

 concave interspaces ; the first one, situated about the 

 middle of the base, and the last one well up in the 

 umbilicus; on all of these the lines of growth are so conspicuous as 

 to give them a distinctly beaded appearance ; at their termination 

 they form distinct points on the somewhat expanded thin edge of 

 the peritreme. The aperture within is dull, opaque white, with a 

 narrow, much thinner, semi-transparent, somewhat expanded, sharp- 

 edged border. This gives the appearance of thickening, but there is 

 no raised opaque white line, said by some author to be the dis- 

 tinguishing character of Molleria. 



Greatest diameter, about 3'2°""; height of body-w^horl, about 



j.gmm 



Choristella gen. nov. 



Figure 8. 



This genus is proposed for two species of small shells of few con- 

 vex whorls forming a flattened, little elevated spire with minute, 

 scarcely raised, nuclear whorl and large body-whorl. Suture very 

 deep, somewhat channeled. Umbilicus small, round, deep, showing 



