238 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 85 



HENDEUSONINA (SCOBINAPOMA) SCOBINA (Gundlach) Pfciffer 



Shell quite small, ovate, red or pale yellow, usually with a thin 

 jjeriostracum, which gives the surface a watered-silk effect. Nuclear 

 whorls about 2, microscopically granulose, the last portion showing a 

 few hairlike incremental lines. Postnuclear whorls with fine tubercles 

 which lend the surface a filelike aspect. The last whorl is always 

 solute and somewhat descending near the end. Base well rounded, 

 narrowly openly umbilicated. Aperture broadly oval, almost sub- 

 circular, angulated posteriorly. The peristome is double, the outer 

 narrowly expanded and reflected, the inner only slightly smaller, also 

 reflected and adnate to the outer. Operculum thin, covered with a 

 finely granular deposit. 



Of the animal of H. (/S.) seohina, Gundlach says that it is brownish 

 with small flecks of white on all of the foot. Head, with the exception 

 of the snout, blackish. Eye ring and base of tentacles clay-yellowish- 

 white, tentacles black with yellowish tip. The animal spins a rather 

 long thread with which it suspends itself. 



The animals of H. (S.) scohina galwnonensis seen by us have the 

 sides of the body and tip of the snout smoke-gray, the rest of the snout 

 and median dorsal parts are sooty. Sole of foot smoke-gray. The 

 base of the tentacles is smoke-gray, the middle half sooty, the distal 

 fourth orange. 



KEY TO THE SUBSPECIES OF HENDERSONINA (SCOBINAPOMA) SCOBINA 



Shell more than 11 mm in length galalonensis 



Shell less than 10 mm in length scobina 



HENDERSONINA (SCOBINAPOMA) SCOBINA SCOBINA (Gundlach) Pfeiffer 



Plate 13, Figure 12 



1863. Chondropoma scobina (Gundlach) PFEaFFER, Malakozool. Blatter, vol 10, 



pp. lSD-100. 



Shell bright red or yellow, the thin periostracum lending it a 

 watered-silk effect Peristomes narrow, a little more so on the parietal 

 wall than the rest, inner about one-half as expanded as the outer. 



The specimen figured, U.S.N.M. no. 354929, was received from 

 Gundlach. It comes from the type locality. Sierra la Guira, and has 

 4.6 whorls remaining and measures: Length, 9.8 mm; greater 

 diameter, 6.7 mm; lesser diameter, 5.4 mm. 



This subspecies is very similar to H. (S.) scohina gaJalonensis^ from 

 which its much smaller size will at once distinguish it. 



