208 , ORTHALICUS. 



on the latter half somewhat stained with reddish-chestnut, and then 

 becoming almost uniform black (pi. 40, figs. 7, 8). Surface some- 

 what shining, with slight growth-wrinkles and close, rather coarse 

 and shallow spiral striae, subobsolete on the last whorl. Whorls G to 

 7, the apex decollate and plugged (at least in the specimen before 

 ine); nepionic shell probably composed of at least 3 whorls, which 

 are densely pitted ; last whorl oblong, tapering below. 



Aperture oblique, rhombic-oval, white inside ; peristome slowly 

 liut decidedly expanding, thick, obtuse, purplish black at the edge, 

 with a broad, blackish-violet border within, shading into violet and 

 then white; columella violet, somewhat cylindrical, subvertical and 

 indistinctly Insinuate ; parietal callus and the reflexed columellar 

 callus black throughout. 



Alt. 87, diam. 42, longest axis of aperture 46 mill. 



Alt. 89, diam. 47 mill, (from Reeve's figure of the type.) 



Colombia: " Parremo," near t/te volcano Tolitna (Adamson coll.); 

 valley of Guaduas (Gen. J. Acosta); " Bogota " (pi. 40, f. 7, 8). 



Bulinus adamsonii GRAY, P. Z. S., 1833, p. 123. Bulimus 

 adamsonii REEVE (de novo), Conch. Icon. pi. 26, f. 165 (1848) - 

 PFR., Conchyl. Cab., p. 242, pi. 65. f. 1, 2 ; Monogr. iii, p. 307; iv, 

 p. 370; vi, p. 14. HUPE in Castelnau's Exped. dans PAmer. du 



Sud, Moll., p. 32, pi. 8, f. 2 BLAND in C. B. Adams' Contrib. to 



Conch, no. 12, p. 231. 



The type of B. adamsonii (pi. 39, figs. 1, 2), was only rather 

 faintly mottled. The specimens figured by Hupe and Pfeiffer, and 

 that shown on my plate 40, figs. 7, 8, are much more heavily veined 

 and mottled, and constitute a color- variety maculaius. It is a larger 

 species than 0. atramentarius, white within, and differently marked 

 externally. 



This is not Orthalicu? adamsonii of Beck, which is 0. bensoni 

 Reev(f. Beck's reference to a figure in Gray's Spicilegia Zoologica 

 is apparently a mistaken one. There is no such figure in that work. 



O. APPROXIMATES (Fulton). PI. 40, figs. 1 , 2, 3. 



Shell oblong-conic, thick and solid; whorls of the spire largely 

 denuded of\*uticle, whitish-purple with a series of oblong purple spots 

 abpve the sutures separated by small white spots, and sometimes a 

 mediun interrupted girdle ; the last whorl covered with a thin 

 cuticle, somewhat yellowish or olivaceous-tawny, becoming reddish 



