CUBAN ANNUDAEIIDAE TORRE AND' BAKTSCH 351 



1852. Choanopoma alatmn Pfeiffer, Conspectus cyclostomaceoruni, p. 60. 

 1920. Tudora (Tudorellata) alatum Henderson and Bartsch, Proc. U. S. Kat. 

 Mus., vol. 58, p. 76. 



Shell depressed-lielicoid, moderately elevated, of flesh-colored 

 ground color on upper sm-face, marked by slender, short dashes, which 

 have theu" long axis spirally arranged. These are present on both 

 spire and base. The base is a little paler than the spire. Peristome 

 white; interior of the aperture orange. Nuclear whorls 1.7, well 

 romided, microscopically granulose. Postnuclear whorls marked by 

 retractively curved axial riblets, which are moderately well elevated, 

 and which are narrower than the spaces that separate them; the spiral 

 sculpture consists of obsolete threads, which are scarcely indicated. 

 Sutme moderately well impressed. Periphery well rounded. Base 

 short, strongly rounded, marked by the continuation of the axial ribs 

 and feebly indicated spiral threads. On the umbilical wall, however, 

 the spiral tlu-eads, while slender, are much more pronounced and quite 

 numerous. The umbiHcus is open but narrower than that of A. {A.) 

 auricoma. Aperture almost circular; peristome double, the inner and 

 outer coextensive and fused except at the posterior angle, where the 

 inner forms a slight shelf separating it from the outer. Operculum 

 typically annularid. 



The specimen described and figured, U.S.N.M. No. 535643, is one 

 of six from Imias. It has 4.6 whorls and measures: Length, 10.3 

 mm.; greater diameter, 16.7 mm.; lesser diameter, 12.7 mm. This i 

 the largest of the six. We selected it because it most nearly aps 

 proaches the measurements of the one described by Pfeiffer. The- 

 smallest specimen of the lot has 4.6 whorls and measures: Length, 9.2 

 mm.; greater diameter, 13.3 mm.; lesser diameter, 10.7 mm. 



Pfeiffer, when he described this species, stated that it came from 

 "S. Yago de Cuba," i. e., Santiago. In 1856 (Malakozool. Blatter, 

 vol. 3, p. 124) he stated that "S. Yago de Cuba" was the locaHty 

 designation in Cuming's collection. This is undoubtedly an error, 

 since the group does not range west to this pomt. We are giving 

 three views of Pfeiffer's type, for which we are indebted to the author- 

 ities of the British Museum; also similar figure of a specimen from 

 Imias, which is about 33 miles east of Guantanamo, on the south coast 

 of Oriente Province, which we beheve identical. The region about 

 Imias, therefore, is probably the type locality for A. (A.) alata. 



ANNULARIA (ANNULARISCA) TACRENSIS, new species 



Plate 40, Figures 4-6 



Shell small, depressed-helicoid, pale horn colored, with peristome 

 white. Interior of the aperture brownish orange. Nuclear whorls 1.5, 

 weU rounded, microscopically granulose. Postnuclear whorls well 



