382 PROCEEDINGS OF THE NATIONAL MUSEUM Vol.80 



ANNULARIA (ANNULARELLA) MAYARIENSIS MAYARIENSIS. new subspecies 



Plate 56, Figures 1-3 



1865. Cistula interstitialis /3 Pfeiffer, Monographia pneiimonopomorum vivent- 



ium, suppl. 2, p. 141. 

 1878. Cistula interstitialis Arango, Contribucion a la fauna malacologica Cubana, 



p. 22, in part. 

 1890. Cistula interstitialis Crosse, Journ. Conchyl., vol. 38, p. 286, in part. 



Shell broadly turbinate, almost helicoid, pale straw colored. Nu- 

 clear whorls almost 2, well rounded, smooth except for the last portion 

 of the last turn, which shows the beginning of the postnuclear sculp- 

 ture. Postnuclear whorls inflated, strongly rounded, marked by 

 retractively slanting, sublamellar axial riblets, of which 66 occur on 

 the first turn, where they are all of about the same strength and 

 spacing; on the second there are 72 of the stronger riblets, and be- 

 tween these the finer threads are well developed; on the last whorl 70 

 of the stronger riblets are present, with the finer threads attaining 

 almost one-third the strength of the sublamellar riblets; these vary 

 in number from 2 to 5, and the spaces separating the coarser riblets 

 vary correspondingly. The coarser riblets are slightly expanded at 

 the summit. Suture moderately channeled. Base short, strongly 

 rounded, openly umbilicated, marked by the continuation of the axial 

 riblets. The umbilical wall is marked by the closely crowded axial 

 riblets and by 10 spiral tlu-eads, of which the outer one is about twice 

 as strong as the rest. The junction of the stronger axial riblets and 

 the spiral threads forms feeble nodules on the umbilical wall. Last 

 whorl solute for about one-fifth of a turn. Aperture broadly oval; 

 peristome double, the inner slightly expanded and coextensive on th(3 

 basal and outer lip, a little narrower on the inner lip, projecting as a 

 conspicuous shelf at the posterior angle; the outer slightly expanded, 

 forming a conspicuous auricle at the posterior angle. Operculum 

 typically annularid. 



The type, U.S.N.M. No. 356321, was collected by C. Wright at 

 Cayo del Rey, Mayari, Oriente Province. It has 4.5 whorls and meas- 

 ures: Length, 11.5 mm.; greater diameter, 12.8 mm.; lesser diameter, 

 10.3 mm. 



ANNULARIA (ANNULARELLA) MAYARIENSIS CANAPUENSIS, new subspecies 



Plate 57, Figures 7-9 



Shell narrowly turbinate, yellowish white. Nuclear whorls almost 

 2, well rounded, smooth except for the last portion of the last turn, 

 which shows the beginning of the postnuclear sculpture. Postnuclear 

 whorls rather liigh between the sutures, inflated, strongly rounded, 

 marked by decidedly retractively slanting, sublamellar axial riblets, 

 of which 66 occur on the first, 52 on the second, and 79 on the last 



