DRYMCEUS, SOUTH AMERICAN. 257 



stride which are usually weak, subobsolete or wanting. Whorls 6 

 to 7, but slightly convex, the last strongly ^compressed beneath, 

 pinched into an obtuse, prominent basal keel; umbilical area excav- 

 ated. 



Aperture half the length of shell or less, angular above and at 

 base, banded or uniform within ; peristome broadly expanded, gener- 

 ally yellow or pink with a white edge, and often bordered within 

 by a dark stripe ; columellar lip obliquely sloping, straightened, col- 

 umellar fold weak or inconspicuous. 



Alt. 36, diam. 15 ; alt. of aperture 18 mill. 



Alt. 28, diam. 13 ; alt. of aperture 14 mill. 



Venezuela : vicinity of Guacharo cave, near the town of Caripe, 

 prov. Cumana (Jonas) ; Caracas (F. Cocking, E. Simon) ; Curiana, 

 on the leaves of palms (Dyson) ; La Guayra (Swift). 



Bulimus trigonostomus JONAS, Zeitschr. f. Malak., 1844, p. 36 ; 

 Mollusk. Beitrage, p. 28, pi. 10, f. 14. PFR., Monogr., ii, p. 94. 

 Otostomus trigonostomus MARTENS, Binnenmoll. Venezuelas, p. 181, 

 in part ; SCHAKO, Ibid., p. 181, pi. 2, f. 18 (jaw and dentition). 



Bulimus curianianus Rve., Conch. Icon., pi. 58, f. 390 (Jan., 1849). 

 PFR., Monogr., iii, p. 374. Drymceus curianianus Jouss., Me"m. 

 Soc. Zool. France, ii, p. 242, 1889. 



Bulimus knorriPFK.., in Philippi, Abbild. u. Beschreib., ii, p. 115, 

 pi. 4, f. 3 (1846) ; Monogr., ii, p. 95 ; iii, 374; iv, 444 ; vi, 79. 

 EEEVE, Conch. Icon., pi. 42, f. 270. Sen A u FUSS, Nachrbl. D. M. 

 Ges.,1881, p. 178. Bulimulus knorri W. G. BINNEY, Proc. Acad. 

 N. S. Phila., 1874, p. 53, and, as Drymceus, Ann. N. Y. Acad. Sci., 

 iii, p. 120 (jaw and teeth). Drymceus knorri JOUSSEAUME, Mem. 

 Soc. Zool. France, ii, 242, 1889. Bulimulus knorri STREBEL & 

 PFEFFER, Beitr. Mex. Land-und Siissw.-conch., p. 95, pi. 15, f. 7a-d, 

 8, f. 9a-d. 



The base is more compressed and angular than in D. correctus, and 

 the aperture generally shorter in proportion to the length of the 

 shell. The original trigonostomus had three girdles of square brown 

 spots above and two bands below, like specimens before me from 

 Caracas, where that pattern occurs with the others mentioned in the 

 description above. Reeve's curianianus (pi. 39, f. 41, 42, 43) is a 

 somewhat better developed form with wider lip. 



There can be no doubt that Pfeiffer's B. knorri as originally 

 defined and figured in Philippi's Abbildungen is identical with 

 17 



