HELIX-MICROPHYSA. Ill 



cies yet remain undiagnostically known. As implied by the spe- 

 cific name, the shell above described has affinity with H. retepora 

 Cox, inhabiting the Flinders Range and at Port Lincoln ; the gen- 

 eral shape is the same, but in H. reteporoides the spire is not quite 

 so elevated, the whorls more rotund, deeper suture, more convex 

 base, larger umbilicus, the costal lamellse equal and very much 

 more numerous, and the transverse stride finer. (Tate.) 



Unfigured species described as Charopa. 



Charopa baldwini ANCEY, Sandwich Is. Bull. Soc. Mai. Fr. 

 1889, p. 176. 



MlCROPHYSA. (Ill, p. 96.) 



H. lansingi Bid. and H. stearnsi Bid. (p. 102), belong to the 

 genus Pristiloma, in the Zonitidce. See Pilsbry, Proc. Acad. N. S. 

 Phila. 1889, p. 191. 



P. HYPOLEPTA Shuttleworth. PI. 21, figs. 28, 29, 30. 



Shell minute, discoidal ; whitish, subtranslucent and shining, 

 with wrinkles of growth above, nearly smooth beneath. Whorls 4, 

 very convex, quite gradually widening, the periphery of the last 

 one above its middle, the lower-lateral surfaces sloping, somewhat 

 as in If. vortex Pfr. The aperture is small, not very oblique, oval. 

 Lip acute, upper and basal margins quite arcuate, the baso-columel- 

 lar margin slightly expanded. The umbilicus is broad, more than 

 one-third the diameter of the shell. Alt. 1, diam. 2} mill. 



Bermuda. 



H. hypolepta SHUTTLW., MS.; see Diag. n. Moll., no. 6, Bern. 

 Mittheil. March, 1854, p. 129. H. (Micropliysa] hypolepta PILSBRY, 

 Proc. Acad. N. S. Phila. 1889, p. 82, t. 3, f. 6, 7, 8. 



It is evidently allied to H. vortex Pfr., but is much smaller, flat- 

 ter, with broader umbilicus. Byalinia minuscula need not be com- 

 pared with this species, a glance at the figures shows at once its dis- 

 similarity. Shuttleworth never described this species, of which he 

 received specimens from Bland. A part of those before me are 

 also from Bland. 



P. INTONSA Pilsbry. PI. 21, figs. 31, 32, 33. 



Shell very small, narrowly umbilicated, thin, chestnut-brown, 

 semi-globose. Whorls 4, well rounded, separated by very deeply 



