CUBAN ANNULARIIDAE TORRE AND BARTSCH 145 



figured, 102 on the second, and 104 on the last. These ribs are ex- 

 panded into auricles at the summit. The spiral sculpture consists of 

 slender threads, of which 5 occur on the first and second of tlie re- 

 maining turns, and 6 on the last between the summit and periphery. 

 Suture strongly constricted, bridged over by the auricles of the ribs. 

 Periphery well rounded. Base short, inflated, well rounded, widely 

 umbilicated, marked by the strong continuation of the axial ribs and 

 by spiral threads, of which 5 are present between the periphery and 

 the edge of the imibilicus, and 3 within the umbilicus; those at the 

 edge of the umbilicus are much stronger than the rest and they render 

 the riblets scalloped at the edge. Last whorl solute for about one- 

 third of a turn. Aperture broadly oval; peristome double, the inner 

 moderately exserted and slightly expanded; the outer moderately 

 broadly expanded, strongly fluted at the junction of the inner and 

 basal angle, and less so on the outer and inner lips, marked by con- 

 centric laminae. Operculum typically torrellid. The breathing 

 siphon has its origin immediately behind the peristome and it is re- 

 flected into the umbilicus as a slightly twisted, tapering tube, which 

 completely plugs the mnbilicus. 



The specimen described and figured, U.S.N. M. No. 535529, a 

 cotype received from Gundlach, comes from Dos Cecilias, near 

 Coliseo, Matanzas Province. It has almost 4 whorls remaining and 

 measures: Length, 8.0 mm. ; greater diameter, 4.9 mm. ; lesser diameter, 

 4.3 mm. 



Gundlach states (Malak. Blatter, vol. 4, p. 42, 1857) that the^anmial 

 is whitish, head and neck with reddish sheen. Tips of tentacles 

 somewhat greyish." 



The species appears to range through the many limestone hills 

 surrounding the region of Coliseo. 



TORRELLA (TORRELLA) IMMERSA ([Gundlach] Pfeiffer) 



Shell elongate-conic, flesh colored, with or without a brownish 

 tinge. Nuclear whorls 2, inflated, well rounded, microscopically 

 granulose, forming a mammillated apex. Postnuclear whorls strongly 

 inflated, strongly rounded, marked by slender, low, lameUar, hollow 

 axial ribs, which are slightly retractively curved. These ribs are 

 feebly expanded into auricles at the summit. The spiral sculp- 

 ture consists of feeble threads. Suture very strongly constricted, 

 rendered all the more conspicuous because of the feeble development 

 of the auricles at the summit of the ribs. Periphery strongly rounded. 

 Base short, inflated, broadly umbilicated, well rounded, marked by 

 the continuation of the axial ribs and by rather feeble spiral threads. 

 Last whorl solute for about one-third of a turn. Aperture broadly 

 oval; peristome double, the inner moderately exserted; the outer only 



