THE CYCLOPHORID LAND MO'LLU'SKS OF AMERICA 217 



"Shell rather narrowly, deeply umbilicate, low-turbinate, very dark 

 chestnut with indistinct wide, black streaks, the eroded inner whorls 

 dull red; moderately solid. Surface glossy, with sculpture of close 

 rib-striae, which are a little waved or crimped. Whorls fully 4, con- 

 vex, rapidly widening. Aperture large, moderately oblique, circular, 

 a trifle angular above. Peristome blunt, continuous, in contact with 

 the preceding whorl for a short distance only. Umbilicus deep, its 

 diameter contained 9 or 10 times in that of the shell. 



"Alt. 14, diam. 20 mm. ; length of aperture 10.5, width 10 mm. 



"Alt. 14.5, diam. 19.5 mm. ; length of aperture 10.8, width 10 mm. 

 Operculum whitish externally, composed of about 6 flat whorls around 

 a sunken, corneous nucleus about 1 mm. diam. Internally there is a 

 slight central mucro, which lies just within the edge of the dull scar 

 of attachment. Diam. 9 mm. 



"Santa Marta Mts. at El Libano [Colombia], at 6,500 feet eleva- 

 tion, under decaying leaves in forest. 



"It is about the size of A. dysoni, but with stronger, straighter rib- 

 striae and slightly more oblique aperture. A. pdzi Crosse is somewhat 

 similar, but has a wider umbilicus, smaller aperture and is more de- 

 pressed. A. smithi has a much smaller umbilicus than A. sanctae- 

 marthae at any stage of growth; the aperture is larger and more 

 oblique, the color is darker, and the operculum differs. This species 

 is respectfully dedicated to Mr. H. H. Smith." 



APEROSTOMA (NEOCYCLOTUS) CORPULENTUM (E. A. Smith) 



Plate 29, FiGtmBS 1-3 



1878. Cyclotus corpuJentns E. A. Smith. Ann. Mag. Nat. Hist., ser. 5, vol. 2, p. 482. 

 1897. Neoci/clotus (Neocyclotus) corpulentus Kobelt and Mollendorff, Nachrb. 



deutschen malak. Ges., vol. 29, p. 137. 

 1923. Poteria {Neocyclotus) corpulentus H. B. Baker, Occ. Pap. Mus. Zool. Univ. 



Michigan, No. 137, p. 43. 



Shell helicoid, covered with a bright chestnut-brown periostracum, 

 which is of about the same shade on the spire and base; interior of 

 aperture pale buff. The nucleus consists of 2 small, well-rounded, 

 smooth turns. The postnuclear whorls are strongly rounded and 

 marked by weak, slender, wavy, somewhat vermiculated axial riblets, 

 which become decidedly reduced on the last portion of the last turn. 

 Suture profoundly broadly channeled. Periphery well rounded. 

 Base narrowly umbilicated, inflated, strongly rounded, and marked by 

 the continuation of the axial riblets, which pass over the umbilical 

 wall. Aperture very large, almost circular, slightly flattened toward 

 the base and weakly angulated at the posterior angle ; peristome sim- 

 ple ; outer lip thin ; inner lip thickened. The parietal wall is covered 



