CUBAN ANNUDARIIDAE TORRE AND BARTSCH 321 



1865. Choanopoma perplicatum Pfeiffer, Monographia pneumonopomorum 



viventium, suppl. 2, p. 103. 

 1920. Annularia {Annularia) perpUcata Henderson and Bartsch, Proc. U. S. 



Nat. Mus., vol. 58, p. 73. 

 192-4. Chondropoma perplicatum Baker, Nautilus, vol. 39, p. 90. 



Shell elongate-conic, pale yellow, with the early whorls pale chestnut- 

 brown, the rest pale yellow, which is also the color of the peristome. 

 Nuclear whorls 1.5, inflated, well rounded, microscopically granulose, 

 forming a blunt apex. Postnuclear whorls inflated, strongly rounded, 

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

 which 96 occur on the first turn, 116 on the second, 150 on the third, 

 and 172 on the last. The spiral sculpture consists of strong cords, 

 of which 6 are present on the first, 7 on the second, and 8 on the 

 remaining turns between the summit and the suture. These cords 

 are not all of exactly the same strength or spacing. The fii'st of them 

 is at the summit of the turns. The axial riblets, in joining the cords, 

 form strongly elongated, narrow nodules, while the spaces enclosed 

 between them are more or less rectangular areas. Suture strongly 

 constricted, channeled. Periphery well rounded. Base moderately 

 long, well rounded, narrowly umbilicated, marked by the continuation 

 of the axial riblets and by 5 spiral threads. Within the umbilicus 

 are 4 additional spiral threads, which are a little less strong. The 

 junctions of the axial riblets and spiral threads on the base and in 

 the umbilicus also form slender nodules. The last whorl is solute 

 for about one-sixth of a turn. Aperture broadly ovate; peristome 

 double, the inner scarcely exserted, reflected over and appressed to 

 the outer; the outer moderately, broadly expanded, a little narrower 

 on the parietal wall, forming a conspicuous auricle at the posterior 

 angle, somewhat produced at the junction of the outer and basal 

 lip, and marked by a series of concentric lamellae. Operculum 

 typically annularid. 



U.S.N.M. No. 355893 contains 2 specimens collected by Gundlach 

 at Cabo Cruz, Oriente Province. The larger of these we have de- 

 scribed and figured. It has a little over 4 whorls and measures: 

 Length, 10.2 mm. ; greater diameter, 6.0 mm. ; lesser diameter, 4.8 mm. 



ANNULABIA (JUANNULARIA) ARGUTA Pfeiffer 



Shell elongate-conic, pale yellow. Nuclear whorls a little more 

 than 2, inflated, strongly rounded, microscopically granulose, forming 

 a pupoid apex. Postnuclear whorls inflated, strongly rounded, marked 

 by sublamellar, retractively slanting axial riblets. In addition to 

 these axial riblets, the whorls are marked by strong spiral keels, of 

 which the first at the summit is weaker than the rest. These spiral 

 keels are separated by broad, concave channels, the width of which 

 is about four tunes that of the keels. The junctions of the axial ribs 



