150 BITTIUM. 



r. SQUAMULOSA, Pease. = Coralliophila. 



F. PouLSENii, Morch. (Unfigured.) Eleuthera, Bahamas. 



Genus BITTIUM (Leach), Gray, 1847. 



B. GEMMATUM, Watsoii. PI. 29, figs. 73, 75, 85. 

 Longitudinally ribbed, spirally ridged, developing two spiral 



rows of rather large tubercles on the centre of each whorl, thin, 

 translucent white. Length, 8 mill. 



Atlantic Coast of Spain, Portugal; 27-994 fnis. 



Sometimes the sculpture is so faint as greatly to alter the appear- 

 ance of the shell. 



Jeffreys changed the name to Watsoni (figs. 75, 85) on account of 



C. gemmatmn, Hinds ; but the latter is not a Bittium, 



B. LACTEUM, Phil. PI. 29, figs. 74, 76, 77. 



Whorls flattened, with three spiral rows of tubercles on each, 

 body whorl with three inferior rows of less tuberculate ribs ; white. 



Length, 8 mill. 



Mediterranean Sea, Canary Is. 



The synonyms include B. niveum, Bivona, B. elegans. Petit, B. 

 Algerianuni, Sowb. The following are slight variations from the 

 typical form : var. lutea, B. D. D. (fig. 76), uniformly yellowish ; 

 var. tessellata, B. D. D., tessellated with chestnut between the granu- 

 lations; var. quadriseriata, B. D. D. (fig. 77), with four rows of 

 granules instead of three on the lower whorls. 



B. RETicuLATUM, Da Costa. PI. 29, figs. 78-83. 



Whorls convex, with four spiral ribs, crossed by longitudinal 

 plications and occasional varices, the intersections scabrous or 

 nodulous, base of body whorl with spiral sculpture only ; uniform 

 chestnut color. Length, 13-15 mill. 



Europe, Canary Islands. 



The synonymy includes B. scahrum, Olivi, B. lima, Brug., 

 B. Latreillei, Payr., B. grannlosmn, Risso, B. mamillatum,, Risso, B. 

 augustmn, Desh., B. ferrugineiim, Midd., B. vidgatissima, Clark, 

 B. afrmn, Sandri, B. acuminatum. Pennant, B. Danicum, Beck, B. 

 elongatum, Sowb., B. spina, Tiberi, B. baccatum, Costa, B. grantda- 

 tum, Costa. 



Bucquoy, Dautz. et Dollf (Moll. Roussillon) enumerate the fol- 

 lowing varieties ; which are however, scarcely entitled to varietal 

 rank; 



