288 PROCEEDINGS OF THE NATIONAL MUSEUM Vol.89 



which it covers to quite an extent. The outer peristome is rendered 

 rather irregular by the siphon at the posterior angle. Operculum 

 typically annularid. The siphon is directed backward and opens 

 into the suture. 



The type, U.S.N.M. No. 535609, comes from the northeast slope 

 of La Puntilla, near Remedios, Santa Clara Province. It is a com- 

 plete specimen having 6.1 whorls and measures: Length, 18.8 mm.; 

 greater diameter, 10.3 mm.; lesser diameter, 8.7 mm. 



This species occurs abundantly at the type locahty and in the 

 region of Zulueta, Central San Agustin, and the north slope of the 

 Sierra de Meneses, near Yaguajay and Juncalito; likewise at Pie 

 Valdes and El Yigre, Yaguajay. Throughout this entire range the 

 species maintains a remarkable concordance of characters, so that it 

 is impossible to spUt it into subspecies. The large size will distin- 

 guish it at once from all the other Annularodes. 



ANNULARIA (ANNULARODES) PEREZI, new species 



Shell elongate-ovate, straw colored, with interrupted spiral bands 

 of brown. The early nuclear whorls are also marked with brown. 

 Nuclear whorls 2, small, inflated, microscopically granulose. Post- 

 nuclear whorls well rounded, marked by strong, almost sublamellar, 

 retractively curved axial ribs, which are a little more distantly spaced 

 on the early turns than on the last. These ribs either individually, 

 or by the combination of 2 or 3, form conspicuous hollow cusps at 

 the summit. Suture strongly constricted. Periphery well rounded. 

 Base moderately long, well rounded, openly umbUicated, marked by 

 the continuation of the axial ribs, which extend over the umbilical 

 wall, and by a series of spiral threads on the umbilical wall, which 

 render the axial riblets nodulose. The actual number of these cannot 

 be determined because of the reflected inner lip of the outer peristome. 

 Aperture almost circular; peristome double, the inner exserted and 

 slightly reflected; the outer broadly expanded on the inner and parietal 

 wall, the latter adnate to the preceding turn, narrow on the basal and 

 outer lip, forming a conspicuous auricle at the posterior angle, which 

 is rendered irregular by the siphon. The outer peristome is marked 

 by a series of concentric lamellae which are best developed at the 

 auricle. Operculum typically annularid. Siphon reflected into the 

 suture, where it opens. We are recognizing two subspecies, which 

 the following key and descriptions will characterize: 



KEY TO THE SUBSPECIES OF ANNULARIA (ANNULARODES) PEREZI 



Interrupted spiral bands of brown conspicuous perezi 



Interrupted spiral bands of brown inconspicuous or absent guitarti 



