184 PROCEEDINGS OF THE ACADEMY OF [April, 



arched growth-lines and several slightly impressed lines of growth- 

 arrest. Whorls moderately convex. Suture distinctly impressed, 

 oblique. Aperture lanceolate, the columella a little thickened and 

 straightened. 



Length 1.6, diam. 0.6, length of aperture 0.6 mm.; 7 whorls. 



Type No. 3093, A. N. S. P. 



The shell is pale gray with a rather wide opaque white band below 

 the suture. Probably belongs to the genus or subgenus Subularia. 

 The lines of growth-arrest are all sublateral. 



Astrsea domingensis n. sp. 



Aslralium longispinum Lam., Gabb, Tr. Amer. Philos. Soc, XV, p. 242. 



A species resembling A. americana in shape. The flat whorls have 

 sculpture of numerous (about 9) low spiral cords, and extremely 

 numerous, fine and low, protractive riblets. At the periphery there 

 are slender, straight spines projecting above the suture, about 10 

 on the last whorl. Height and diameter about 16 mm. as preserved. 



Type No. 2827, A. N. S. P. 



The specimen is an external mould of the spire, or part of it, in a 

 hard rock. It differs so conspicuously from A. longispina that we 

 are surprised at Gabb's identification. The spines, on the next to 

 the last whorl preserved, are slightly over 2 mm. long. It appears 

 to be somewhat related to Astralium chipolanum Dall. 



Circulus domingensis n. n. 



Cydostrema striata Gabh, Tr. Amer. Philos. Soc, XV, 1873, p. 242. Not 

 Circulus striatus Phil. 



Eight spiral threads may be counted on the penult whorl just 

 behind the aperture, seven on the next earlier whorl. On the last 

 whorl the cords become widely separated by flat intervals on the 

 upper surface, are weak and inconspicuous at and a short distance 

 above the periphery, but remain strong and regular on the base. 



Alt. 2.25, diam. 4.8 mm. 



Though larger than the recent species of Circulus, with the spire a 

 little more raised, we can find no differences of generic importance. 



Type No. 2835. 



Discopsis (■?) naso n. n. 



Adeorbis carinata Gabb, Tr. Amer. Philos. Soc, XV, 1873, p. 243. Not 

 A. carinata A. Ad., 1863. 



The first two whorls are convex above; the third is flattened below 

 the suture, the flat area bounded by an angle, and a second, less 

 conspicuous spiral angulation runs above the periphery. The 

 penult whorl is rounded, but shows the top of the peripheral carina 



