CUBAN ANNULARIIDAE — TORRE AND BARTSCH 20*7 



irregular by the siphon immediately behind it. The outer peristome 

 is marked by a series of wavy, concentric lines. Operculum typically 

 opisthosiphonid. 



The type, U.S.N.M. No. 314959, was collected by Dr. Thomas 

 Barbour near Mayajigua, in the Sierra de Judas, Santa Clara 

 Province. It has a little over 3 whorls remainmg and measures: 

 Length, 13.5 mm.; greater diameter, 9.1 mm.; lesser diameter, 6.1 mm. 



OPISTHOSIPHON (CUBITASIPHONA) SANCHEZI, new species 



Plate 16, Figure 5 



Shell ovate-conic, yellowish white, with a somewhat watered-silk 

 effect. Nuclear whorls 1,5, small, somewhat mflated, well rounded, 

 microscopically granulose. Postnuclear whorls strongly inflated, 

 marked by slightly retractively curved, sublamellar axial ribs, wliich 

 are more distantly spaced on the early turns than on the later, 

 becoming closely approxhnated on the last whorl. Of these ribs, 30 

 are present on the first of the remaining turns and 222 are on the 

 last. Some of these ribs at quite regular intervals are gathered into 

 bold, hollow tufts at the summit. Suture moderately constricted. 

 Periphery inflated, strongly rounded. Base short, inflated, strongly 

 rounded, marked by the continuation of the axial ribs and by feeble 

 spiral tlireads, which become mtensified witliin the umbilicus. Aper- 

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

 outer broadly expanded, forming a veiy conspicuous auricle at the 

 posterior angle and deeply infolded on the middle of the inner lip. 

 Posterior to the fold a broad expanded flap almost covers the umbilicus. 

 The outer peristome is marked by numerous concentric lamellae. 

 Operculum typically opisthosiphonid. Siphon at the posterior angle 

 of the aperture beliind the peristome directed into the suture. 



The type, U.S.N.M. No. 535475, and a large series of specimens 

 were collected by Bartsch on Loma de Santa Cruz near Central 

 Senado, Camagiiey Province. The type has almost 4 whorls remain- 

 ing and measures: Length, 12.4 mm.; greater diameter, 8.8 mm.; 

 lesser diameter, 6.2 mm. 



This species is very variable in size. An adult specimen of 3.3 

 whorls measures: Length, 9.0 mm.; greater diameter, 6.6 mm.; 

 lesser diameter, 5.3 mm. 



Animals of tliis species were collected by Bartsch on Santa Cruz 

 Mountain, near Senado, September 6, 1928. His description follows: 

 Dorsal part deeply olivaceous with a pinldsh area beliind the tentacles. 

 The whole dorsal surface is marked by flne wliite dots and by short 

 streaks, most concentrated a little before and beliind the tentacles. 

 Sides dark oHvaceous, marked by rather large wliite spots, which 

 are composed of numerous fine dots. Sole of foot pale olivaceous. 

 Tentacles with a pale orange wash. 



