152 BITTIUM. 



B. ENODE, Watson. PI. 30, fig. 1. 



Finely longitudinally ribbed, terminating in a spiral subnodulous 

 thread at the suture, a little below this a raised spiral line forms a 

 slight carina, a less distinct one forms the inferior termination of the 

 ribs, base of body whorl concave, smooth ; ivory white. 



Length, 5 mill. 



Off Pernambuco, Brazil; 675 fms. 



B. VARIUM, Pfeiffer. PI. 29, fig. 86. 



Thin, diaphanous, greyish brown, unicolored or with chocolate 

 cingulse, longitudinally plicate, decussated by spiral striae, the pli- 

 cations obsolete on lower part of the body- whorl which is varicosely 

 gibbous. Length, 5 mill. 



West Indies. 



It is B. reticulatum, Muhlf., and B. gibberulum, Ads. 



B. PALLIDUM, Pfr. PI. 29, fig. 87. 



Somewhat solid, whitish or light corneous ; whorls 9, slightly 

 convex, longitudinally plicate and spirally minutely striate, the last 

 varicose. Length, 6 mill. 



Cuba, St. Thomas, W. L 



Larger and more robust than the preceding species, B. colu- 

 mellare, d'Orb., is a synonym. 



B. NIGRUM, Totten. PL 29, figs. 88, 89. 



Chocolate color, and conical-elongated when young, becoming 

 lighter colored and less conical when adult, tuberculated by decus- 

 sating sculpture, of which the spiral only persists on lower part of 

 body-whorl. Length, 5 mill. 



New England to Florida. 



The synonyms are B. reticulatum, Totten, and B. Sayi (Menke), 

 of Gould, etc. 



B. iota, C. B. Ad. (fig. 89), is probably only the juvenile of this 

 species. 



B. FILOSUM, Gould. PL 29, fig. 90. 



Whorls 8, planulate, each with four incised spiral lines, usually 

 becoming obsolete on lower part of body whorl, suture excavated ; 

 corneous, varying to chocolate color, sometimes light colored with 

 the incised lines chocolate, interior chestnut color. Length, 15 mill. 



Sitka to Monterey, Cal. 



