EASTERN PROVINCE — SOtlTHEEN REGION SPECIES. 



399 



30""-'; diameter, 12"!"'. Of aperture: Length"'"'; 12, interior breadth, 

 7""". (Albers.D 



Fig. 434 represents a common form of Bnlimns Markv.* 



Dr. Pfeiffer's description of i>. Maria; is as follows: 



Shell narrowly nmhilicated, oblong-conic, solid, rather smooth, white, 

 often marked with spots and obsolete blotches of horn- fig. 435. 

 color: spire conic, acnte; whorls Oi, rather convex, the 

 last nbont as long as the spire, hardly attenuated at base; 

 colnmella with a small dentiform fold; aperture scarcely 

 oblique, acurainately oblong, brownish within; peristome 

 straight, its right margin somewhat arched, its columellar ^W^^ j 

 margin broadened above, spreading. Length, 33™'"; diameter, ^^ ^' 

 14-15""". Of aperture: Length, lG-1 7'"'"; breadth, 7i""". B.aitematus. 



One of the uuifonnly white forms of the species is figured in Fig. 435, 

 aiul two of the same from the table-land west of Fort Clark, figured in 

 Fig. 433, show the variation in breadth of which ^lo. 436. 



the species is capable. 



Jaw as usual in the genus; numerous delicate 

 ribs; a strong upper muscular attachment. 



Ihere are about 7G rows of teeth on the nnguai b. aitematus. 



membrane of B. aitematus, each consisting of 75 (37-1-37) teeth. Cen- 

 tral teeth long, unicuspid, bluntly pointed, the laterals bicuspid, mod- 

 ified as they pass off laterally into the marginals. 



Genitalia not observed. 



Bulinauliis ScliiedeaiiHS, Pfeiffer. 



Shell perforated, ovate acute, calcareous, white, with irregular Ion- 



• J 



gitudiual wrinkle-like striae; whorls Gi, 



rather convex, the last as long as the spire; i£S 



aperture oval-oblong, brownish within; n\^ 



colnmella obsoletely folded; peristome 



simple, acute, its margins joined with a 



shining callus, the columellar one broadly 



reflected, white and shining. Length, 31, b schiahamis. 



diameter, 17™". Length of aperture, 17'"'"; breadtli, 0™". 



* 'IHie figure being in outline is uushaded in the aperture, which iu the original is 

 (lark brown. 



