CUBAN ANNUK^raiDAE TORRE AND BARTSCH 367 



Spiral threads on umbilical wall present. 



Interstitial axial threads few and strong toroensis 



Interstitial axial threads manj' and fine. 



Auricle at posterior angle of aperture very strong, mayensis 

 Auricle at posterior angle of aperture not very 

 strong. 



Spiral threads on umbilical wall few. 



Spiral threads on base present yunquensis 



Spiral threads on base absent wrighti 



Spiral threads on umbilical wall not few__ mayariensis 



ANNULARIA (ANNULARELLA) HENDERSONI, new species 



Plate 49, Figures 1-3 



?1878. Cistula inter stitiale Arango, Contribucion a la fauna malacologica Cubana 



p. 22 in part. 

 ?1880. Cistula interstitiale Kobelt, Jahrb. Deutsch. Malak. Ges., vol. 7, p. 266. 

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



Shell conic, straw colored. Nuclear whorls 2, well rounded, smooth, 

 except for the last portion of the last turn, which shows the beginning 

 of the postnuclear sculpture. Postnuclear whorls inflated, strongly 

 rounded, marked by retractively slanting, slender axial riblets, of 

 which 44 occiu- on the first; on the second, intercalated riblets make 

 their appearance which raise the number to 98 ; on the last whorl the 

 intercalated riblets become as strong as the primary ones, and here 

 they become conspicuously expanded into slender cusps at the 

 summit. On the last turn, 194 of these are present. Suture strongly 

 channeled. Periphery strongly rounded. Base short, inflated, 

 strongly rounded, broadly, openly umbilicated, marked by the con- 

 tinuation of the axial ribs and by a strong spiral cord at its anterior 

 margin. The umbilical wall is also marked by the continuation of the 

 axial ribs, but here the riblets become much enfeebled. Seven spiral 

 threads are also present on the umbilical wall. Last whorl adnate. 

 Aperture broadly oval; peristome double, the inner slightly exserted, 

 decidedly reflected on the outer lip, where it is appressed to and co- 

 extensive with the outer lip; the outer is rather broadly expanded, 

 forming a conspicuous auricle at the posterior angle, which is adnate 

 to the preceding turn; on the inner lip the two peristomes are quite 

 distinct. Operculum typically annularid. 



The type, U.S.N.M. No. 356290, was collected by Henderson and 

 Bartsch at the foot of Monte Libano, near Guantdnamo, Oriente 

 Province. It has 4.8 whorls and measures: Length, 9.8 mm.; greater 

 diameter, 10.4 mm.; lesser diameter, 7.7 mm. 



