96 CYCLOSTREMA. 



C. DIVISA, Adams. PL 33, figs. 87, 88. 



Widely umbilicated, turbinate, spire elevated, with obtuse apex, 

 white; whorls 3, rounded, last whorl obliquely descending, becoming 

 free ; aperture obliquely ovate. Diam. 4 mill. Europe. 



C. serpuloides, Mtg. is a synonym, 



C. NI YEA, A. Ad. PL 33, figs. 89, 90. 



Widely umbilicated, obliquely semiglobose, convex above, some- 

 what flattened below, spire slightly elevated, whorls rapidly increas- 

 ing, aperture large, obliquely ovate. Diam. 5 mill. 



Japan. 



Adams very curiously publishes this as Chemnitz's nivea, and 

 says that it is exactly similar to the figures in the "Conchylien 

 Cabinet." The latter, is however, not being binomial, a synonym of 

 C. Icevis, Kiener, and neither agrees with the description nor the 

 figures published by Adams (which I copy). 



C. RUGULOSA, Jeffreys. PL 33, figs. 91, 92. 



Narrowly umbilicated, pellucid, yellowish white, with short, 

 obtuse spire, smooth, microscopically rugulose and spirally striate ; 

 whorls 3, ( convex, the last large, suture well-impressed. 



Diam. 1'3 mill. 



Norway, Mediterranean, New England (Verrill). 



C. BASISTRIATA, Brugnone. PL 33, figs. 93, 94. 



Narrowly umbilicated, shining, smooth ; whorls 4, tumid, with 

 deep suture, rapidly increasing, base with oblique, arcuate striae 

 running into the umbilicus. Diam. 2'25 mill. 



Spitsbergen to Drobak; 50-1 333 /ms. Fossil, Italian plioiene. 



The striae sometimes extend over the whole shell, this state being 

 C. profundum, Friele: C. striolatum Sars ms., is another synonym. 



C. MINUTUM, Jeffreys. PL 33. fig. 95. 



Perforate, thin, transparent, polished, white; whorls 3, convex, 

 rapidly increasing; peristome continuous, partly appressed. 



Diam. 62 mill. Mediterranean Sea, 



C. CUTLERIANA, Clark. PL 33, fig. 96. 



Narrowly umbilicated, depressed globose, spirally striate, white, 

 whorls convex, rapidly increasing, suture deeply excavated. 



Diam. 2 mill. Europe. 



Helicella mutabilis, Costa, is a synonym. 



