CUBAN ANNULAPJIDAE— TORRE AND BARTSCH 341 



The type, U.S.N.M. No. 535592, has 2.3 whorls remaining and 

 measures: Length, 8.0 mm.; greater diameter, 6.0 mm.; lesser di- 

 ameter, 5.2 mm. 



GUAJAIBONA, new subgenus 



Shell ovate-conic, sculptm'e like Blaesospira, but with only the last 

 part of the last whorl solute. 



Type: Annularia (Guajaibona) pretrei d'Orbigny. 



ANNULARIA (GUAJAIBONA) PRETREI (Orbigny) 



Plate 39, Figure 7 



1842. Cyclostoma -pretrei Orbigny, in Sagra's Histoire physique, politique et 

 naturelle de I'lle de Cuba, vol. 1, p. 260, pi. 22, figs. 9-11. 



1850. Choanopoma pretrei Gray, Nomenclature of molluscous animals and shells 

 in the collection of the British Museum, p. 51. 



1916. Annularia pretrei Henderson, Cruise of the Tonias Barrera, p. 281. 



1920. Blaesospira pretrei Henderson and Bartsch, Proc. U. S. Nat. Mus., vol. 

 58, p. 74. 



Shell broadly conic, thin, yellowish white, with the nuclear tip suf- 

 fused with orange; peristome yellowish white, faintly rayed with 

 brown in the depressions of the outer lip. Nuclear whorls 2.3, well 

 rounded, smooth, except for the last portion of the last turn, which 

 shows the beginning of the axial sculpture. Postnuclear whorls 

 inflated, strongly rounded, marked by rather strong, more or less 

 distantly but irregularly spaced, lamellar axial ribs, which bear slender 

 hollo v/ tubercles. Of these tubercles 5 are present on the first and 

 second turns between the summit and the periphery, and 6 are on the 

 last. The spaces between these stronger riblets are marked by slender, 

 wavy axial threads, which vary in number and spacing. In some 

 spaces only 2 occur, between the stronger ribs, while in others as many 

 as 7 are present. Suture strongly constricted. Periphery inflated, 

 strongly rounded. Base broadly, openly umbilicated, marked by the 

 continuation of the axial sculpture, which extends strongly over the 

 base into the umbilicus, where it becomes somewhat enfeebled. On 

 the base the stronger riblets bear 6 spines, of which the outer 4 are 

 heavier than the rest, the fifth being very slender, while the sixth series 

 marks the edge of the umbilicus. On the umbilical wall 5 rows of 

 feeble spines are present. Aperture circular; peristome double, the 

 inner moderately exserted; the outer broadly expanded on the outer 

 and basal lip and fluted, less strongly expanded on the inner lip, and 

 marked all around by feeble, concentric lamellae. Operculum with 

 subcentral nucleus, bearing a strong calcified spiral lamella, which 

 rises slightly obliquely from the basal plate and which is slightly out- 

 bent at the outer margin. 



