CUBAN ANNULARIIDAE — TORRE AND BARTSCH 381 



The type, U.S.N.M. No. 356328, was collected by C. Wright 

 east of Ermitage, between Santiago and Guantanamo, Oriente Prov- 

 ince. It has 4.5 whorls and measures: Length, 10.0 mm.; greater 

 diameter, 9.5 mm. ; lesser diameter, 6.9 mm. 



ANNULARIA (ANNULARELLA) MA YARIENSIS, new species 



This species is differentiated from the rest of the Annularcllas by 

 having the last whorl solute, the inner lip of the outer peristome nar- 

 row, the umbilical wall with many spiral threads, and with the in- 

 terstitial axial threads numerous and fine, and a weak auricle at the 

 posterior angle of the aperture. 



The three subspecies here recognized come from the limestone 

 blocks inland from Nipe Bay, Oriente Province : 



KEY TO THE SUBSPECIES OF ANNULARIA (ANNULARELLA) MAYARIENSIS 



Shell pale orange welchi 



Shell yellowish white. 



Shell broadly turbinate mayariensis 



Shell narrowly turbinate canapuensis 



ANNULARIA (ANNULARELLA) MAYARIENSIS WELCm, new subspecies 



Plate 56, Figures 4-6 



Shell broadly turbinate, pale orange. Nuclear whorls 2, inflated, 

 well rounded, smooth, except for the last part of the last turn, which 

 shows the beginning of the postnuclear sculpture. The first of the 

 postnuclear whorls is marked by 52 slender, retractively curved, 

 axial riblets. On the last part of the first postnuclear turn the fine 

 interstitial axial threads make their appearance. These increase 

 steadily in size and on the last turn they are also of sublamellar nature 

 and are scarcely differentiated from the larger lamellae. There 

 are 214 riblets on the last turn. Suture fairly strongly channeled. 

 Periphery inflated, strongly rounded. Base short, strongly rounded, 

 marked by the continuation of the axial ribs, which are crowded over 

 the umbilical wall. The umbilical wall also bears 9 spiral threads, of 

 which the outer one is the strongest. The last whorl is solute for 

 about one-fifth of a turn. Aperture subcircular; peristome double, 

 the outer and inner apparently coextensive except at the posterior 

 angle, where the inner forms a slight shelf, and the outer projects as a 

 narrow auricle. Operculum typically annularid. 



The type, U.S.N.M. No. 535632, comes from a hill north of Miranda 

 in the Mercedes Valley, Oriente Province. It has 5 whorls and meas- 

 ures: Length, 12.7 mm.; greater diameter, 14.0 mm.; lesser diameter, 

 9.3 mm. 



