DRYM.EUS, SOUTH AMERICAN. 265 



Bulimus loxensis var., PFR., Monogr., iii, p. 422 ; Conchy lien Cab., 

 pi. 33, f. 17, 18. Bulimus chamceleon PFR.. P. Z. S., 1855, p. 116; 

 Monogr., iv, p. 483. HIDALGO, Journ. de Conchyl., 1870, p. 57 ;. 

 Viaje al Pacifico, p. 107. Thaumastus chamceleon MILLER, Malak. 

 Bl., xxv, p. 193. COUSIN, Bull. Soc. Zool. France, xii, 1887, p. 

 224. 



Some individuals, writes Hidalgo, are nearly blackish on the last 

 whorl by the coalescence of the longitudinal stripes. 



D. LOXENSIS (Pfeiffer). PL 51, fig. 20. 



Shell umbilicate, ovate-oblong, striatulate ; white, irregularly 

 flamed with interrupted reddish streaks. Spire pyramidal, acute ; 

 whorls 7 3-, rather flattened, the last about three-sevenths the total 

 length. Columella somewhat twisted, entering. Aperture oblong- 

 oval, colored within like the exterior; peristome simple, acute ; col- 

 umellar margin broadly reflexed, spread. Alt. 35, diam. 14 mill. ; 

 aperture 16 mill, long, inside 7 wide (Pfr.). 



El Catamaya, near Loxa, Ecuador (Hartwig). 



Bulimus loxensis PFR., Symbolse ad Histor. Helic., iii, p. 85 

 (1846) ; Monogr., ii, p. 203 ; iii, p. 442 (exclusive of variety) ; vi, 

 p. 129. REEVE, Conch. Icon., pi. 40, f. 251. -Thaumastus loxensis 

 MILLER, Malak. Bl., 1878, xxv, p. 193. COUSIN, Bull. Soc. Zool. 

 Fr., xii, 1887, p. 228. 



Differs from D. ambustus in being umbilicated, with longer spire, 

 and over seven, instead of less than six, whorls. 



D. CACTIVORUS (Broderip). PL 48, figs. 31, 32 ; pi. 50, figs. 81, 82. 



Shell ovate-pyramidal, almost im perforate, thin ; white, somewhat 

 cream -tinted below, the apex blue-black, with (form nitidus) or with- 

 out (typical cactivorus) numerous obliquely longitudinal black-brown 

 or reddish-brown streaks, which are lineolate ivith white. Surface 

 glossy, frequently showing iridescent patches under a lens, coarsely 

 and rather Irregularly costulate-striate. Spire straightly conic, apex 

 obtuse, the nepionic If whorls with typical Drymceus sculpture. 

 Whorls 6, slightly convex, the last frequently somewhat angular at 

 the periphery. 



Aperture oblique, ovate, less than half the length of the shell, 

 colored within like the exterior ; outer lip sharp, thin and uuex- 



