CUBAN ANNULARIIDAE TORRE AND BARTSCH 205 



posterior angle, where it is rendered irregular by the siphon, which 

 bends backward at the suture behind the peristome. Operculum 

 typically opisthosiphonid. 



The type, U.S.N.M. No. 314952, was collected by Torre and 

 Henderson at El Cercado, Sierra de Cubitas, Camagiiey Province. It 

 has a little over 4 whorls remaining and measures: Length, 14.3 mm.; 

 greater diameter, 9.3 mm. ; lesser diameter, 7.1 mm. 



Bartsch also collected specimens of this species at La Caridad de 

 Cangilones and Finca Gertrudis, places near the type locality. 



The animals of this species, collected by Bartsch at El Cercado de 

 Mendoza, near Senado, September 2, 1928, were described by him as 

 being flesh colored with a faint olivaceous flush. The dorsal parts are 

 marked with fine dots and with short streaks, and there is a pinkish 

 area behind the tentacles. Sides with many white flattened papillae, 

 which are made up of many fine white dots. Tentacles smoke gray 

 with olivaceous tip. Sole of the foot the same color as the sides, 

 minus the white dots. 



OPISTHOSIPHON (CUBITASIPHONA) CUNAGUAE Welch 



Plate 16, Figure 3 



1929. Opisthosiphon cunaguae Welch, Nautilus, vol. 42, p. 98, pi. 5, figs. 4, 5. 

 1934. Opisthosiphon (Opisthosiphon) cunaguae Welch, Nautilus, vol. 47, p. 132, 

 pi. 11, fig. 7. 



Shell elongate-ovate, varying in color from flesh color thi'ough pale 

 yellow to dark chestnut-brown, unicolor or with interrupted spiral 

 bands. Nuclear whorls 2, inflated, strongly rounded, microscopically 

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

 rounded, the early ones more so than the later, marked by retractively 

 curved axial riblets, of which those on the early turns are lamellar and 

 thickened at intervals to form elongated nodules. These nodules 

 gradually become reduced and disappear on the last turn, where 

 the ribs are well rounded and narrower than the spaces that separate 

 them. The axial ribs are gathered into hollow tufts at the summit at 

 rather close intervals. The specimen figured has 36 of these ribs 

 present on the first whorl and 122 on the last turn. Suture well con- 

 stricted. Periphery well rounded. Base rather short, well rounded, 

 marked by the continuation of the axial ribs and by strong spiral cords, 

 which cover the umbilical wall and which render the axial ribs de- 

 cidedly scalloped at their junctions. Aperture broadly oval; peri- 

 stome double, the inner strongly exserted and slightly reflected at the 

 outer edge; the outer expanded, less so on the basal half of the outer 

 lip, forming a rather conspicuous auricle at the posterior angle; very 

 broadly expanded on the upper portion of the irnier hp, on the middle 



