THE CYCILOPHORID LAND AlOLLUSKS OF AMERICA 241 



parietal wall is covered by a thick callus, which renders the peritreme 

 complete. There is only a weak emargination on the columellar callus. 



The type, U.S.N.M. No. 524068, comes from Puerto Utria, Colombia. 

 It has 3.2 whorls remaining and measures : Height, 27.4 mm. ; greater 

 diameter, 46.7 mm.; lesser diameter, 30.9 mm. Height of aperture, 

 19.4 mm. ; diameter, 23.3 mm. 



This species most nearly resembles A. (A.) hrujen^e, from which it 

 can readily be differentiated by its less strongly ribbed striate 

 sculpture. 



APEROSTOMA (APEROSTOMA) BRUJENSE, new species 



Plate 34, Figubes lS-15 



Shell large, depressed-helicoid. The early denuded whorls vary 

 from rose colored to flesh colored. The last whorl is covered with a 

 brownish, suffused, horn-colored periostracum. There is a narrow 

 light zone immediately above the periphery, while the posterior half 

 of the base is very dark chestnut-brown, and the anterior half and 

 umbilical wall are a little lighter than the upper surface. The nucleus 

 consists of 2 small, well-rounded, smooth turns. The postnuclear 

 whorls are somewhat inflated, well rounded, with an impressed area 

 inmiediately below the summit on the last whorl, while the summit 

 itself appears as an appressed thread. The surface of the postnuclear 

 whorls is marked by rather coarse, retractively slanting axial rib- 

 lets, which vary considerably in strength and spacing. Suture well 

 impressed. Periphery weakly angulated. Base moderately broadly 

 umbilicated and marked by the continuation of the axial riblets, which 

 become fused into stronger ribs on the umbilical wall. Aperture sub- 

 circular with a moderately strong angle at the posterior angle which 

 bears a median groove ; peristome simple ; the outer lip expanded and 

 somewhat reflected; the inner slightly thickened. The parietal wall 

 is covered by a very thick callus, which renders the peritreme complete. 

 There is very weak emargination in this callus at the insertion of the 

 columella. 



The type, U.S.N.M. No. 251418, was collected by Maj. E. A. Gold- 

 man on the Cerro Bruja, Panama, at an elevation of 500 feet. It has 

 4.7 whorls and measures: Height, 28.6 mm.; greater diameter, 49.4 

 mm. ; lesser diameter, 33 mm. Height of aperture, 19.2 mm. ; diameter, 

 24.4 mm. 



The following additional specimens are in the National Museum 

 collections : No. 524069, a topotype from the same source as the type ; 

 No. 228908, a specimen collected by H. Pittier in the mountains around 

 Gaspasalana, High Mamoni, Panama ; No. 251419, five specimens col- 

 lected by Major Goldman at Gatun, Canal Zone. 



This species can be distinguished readily from A. (A.) utriaense 

 by its much stronger rib-striate sculpture. 



