78 DRYM^EUS, MEXICO AND CENTRAL AMERICA. 



distinguished by the more rounded last whorl and a rounded aperture ; 

 I suspect this is a whitish specimen of 0. sulphureus, var. b. 



" The specimens of 0. virginalis examined by Strebel, Beitr. Mex. 

 Land- und Siisswasser-Conch. v, pp. 88, 89, were from Caracas." 



Dr. von Martens notes the following variations : 



b. Whitish. (Fisch. & Crosse, 1. c. p. 496. pi. 23, f. 8). Jalapa 

 (Hoge) ; Teapa, in Tabasco (H. H. Smith); Northern Guatemala 

 at San Luis de Peten (Morelet), and Coban (Bocourt, Salvin). 



c. Var. gracilior. PI. 4, fig. 65. Length 28-29, diam. 11-12, 

 aperture 11-13 mill. (F. & C., 1. c. p. 496, pi. 23, fig. 8a ; Strebel, 

 1. c., p. 88, pi. 6, fig. 5.) 



N. Guatemala: Senahu (Champion). W. Guatemala; Retalhulen 

 (Stoll). S. W. Guatemala: San Agustin (Bocourt); Zapote, on the 

 slope of the Volcan de Fuego (Champion). Nicaragua: La Liber- 

 tad (Belt). 



" Our var. c, gracilior, is very near O.flavidus Menke [see vol. xi, 

 p. 310, pi. 26, figs. 71-73; Ferussac, pi. 142 B. fig. 14; Reeve, 

 Conch. Icon, v, Bulimus, pi. 45, fig. 287 (liliaceus)]; but I have not 

 yet seen a specimen from Mexico or Central America with the deli- 

 cate rosy hue on the lower half of the last whorl, which is so charac- 

 teristic of this species." 



d. Var. citronellus: Angas (pi. 4, fig. 67), subconic, bright yellow, 

 the suture white. Length 27, diam. 13, aperture 12 mill. (Buli- 

 mus citronellus Angas, P. Z. S., 1879, p. 479, pi. 40, fig. 5). 



N.-E. Costa Rica: Puerto Viejo on the Rio Sarapiqui (Biolley). 

 Central Costa Rica : San Jose, and La Uruca near San Jose (Biolley); 

 Alajuela at an elevation of 900 to 1000 metres above the Sea (Orosco); 

 Suralres, alt. 600 metres, near San Mateo (Biolley). S. W. Costa 

 Rica: Boruca, alt. 450 metres (Pittier); Alto de Mano Tigre, 690 

 metres (Pittier). S. E. Costa Rica : between Urea and Liporia, on 

 the low hills (Gabb). 



e. Var. obesus Mart. (pi. 4, fig. 68). Subconic, shorter, uniform 

 whitish. Long. 26, diam. 14, apert. 13 mill. 



E. Mexico : Huatusco, in the State of Vera Cruz (Hille, in Bun- 

 ker's collection). 



D. MORICANDI (Pfeiffer). PI. 4, figs. 62, 63, 64. 



Shell perforate, ovate-conic, thin, engraved with subcontinuous 

 spiral lines ; subdiaphanous, citron-colored. Spire conic, rather 



