BRACHYPODELLA, S.-G. AMPHICOSMIA. 49 



minute rib-stria? as wide as the intervals. AVhorls weakly 

 convex, the last shortly free in front, obtusely angular be- 

 neath. Suture impressed, simple. Aperture subcircular, the 

 peristoine narrowly expanded and subreflexed, thinner, a little 

 sinuous, and slightly angular outwardly. Axis straight, slen- 

 der and simple. 



Length 12.6, diam. 2.6 mm., whorls 9. 



Length 9, diam. 2.1 mm., whorls 8. 



Length 13, diam. 3 mm., whorls 9 to 9y 2 (Pfr., types). 



Porto Rico: San Juan (Blauner) ; Quebradillas, Aguadilla 

 and Vegabaja (Gundlach). 



Cyl. portoricensis PFR., Zeitschr. f. Malak., 1852, p. 151; 

 Monogr., iii, pp. 572; Conchyl. Cab., p. 30, pi. 4, f. 13-15.- 

 SHUTTLEWORTH, Diagn. n. Moll., no. 6, p. 146. CROSSE, J. de 

 C., 1892, p. 26. Brachypodella portoricensis PFR., PILS. & 

 VAN., Proc. A. N. S. Phila., 1898, p. 278. DALL & SIMPSON, 

 The Mollusca of Porto Rico, Bull. U. S. Fish Commission, xx, 

 1900, p. 377. 



This species is related to B. angulifera and B. imitatrix, but 

 is usually larger than either, though the smallest Porto Rican 

 specimens could not, I think, be separated with any certainty 

 from the Haitian or Cuban shells. B. kraussiana is more 

 slender and retains more whorls than portoricensis. The teeth 

 of the radula are practically identical in size and shape in 

 portoricensis, weirilandi and angulifera, but in the former 

 species the ectocones are lower and less distinctly developed 

 than in angulifera, those of the inner laterals being especially 

 indistinct in the usual view from above. In profile, they ap- 

 pear as small, conic bosses. 



Fig. 7 is copied from one of Pfeiffer's. 



Subgenus AMPHICOSMIA Pils. & Van., 1898. 



P. & V., Proc. A. N. S. Phila., 1898, pp. 271, 277. Type 

 C. salleana Pfr. 



Bracltypodcllce with two prominent subequal spiral axial 

 lamellae, both of them serrate or crenulate; base of the shell 

 carinate ; spire shortly, narrowly truncate, the apical whorls 

 smooth. Distribution, Island of Haiti. 



