150 r.nnrM. 



F. 8QUAMULO6A, PeaSC. 



V. PorLSKNII, M>rch. ( I'll figured.) Elenflirra, 



Gem.- I HTTIUM (Leach), Gray, 1847, 



II. -,i MMMIM. Watoon. PI. i>!, figs. 73, 75,85. 



Longitudinally ribbed, ,-pirallv ridged, developing two spiral 

 row- <>t' rather large tubercles on the centre of each \vlmrl, thin, 

 tran-luccnt white. Length, 8 mill. 



Atlantic Coast o/.s>///,, rnrhtuul ; 27-994 fins. 



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

 ance -if the shell. 



.Jeffrey .- ehanirrd the name to Watsoni (figs. 75, 85) on account of 

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



P>. LA< HIM. Phil. PL 29, figs. 74, 76, 77. 



\Vhrls 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, Oimn-if I*. 



Tin- >\ iionynis include B. nireum, Bivona, B. elegans, Petit, 11. 

 Algcri'iiniiii. Sowb. The following are slight variations from the 

 typical form: \i\r.fntra, B. D. D. (fig. 76), uniformly yellowish; 

 var. trw/fufii, B. D. D., tessellated with chestnut between the granu- 

 lation.-; var. tjinitli'isrrlntu, B. D. D. (fig. 77), with four rows of 

 irraimle- in-tead of three on the lower whorls. 



I'.. I:I.TI< ri. A n M. Da Costa. PL 29, figs. 78-83. 



Whorls convex, with four spiral ribs, crossed by longitudinal 

 plication- and occa.-ional variccs, the intersections scabrous or 

 QodllloilS, baoe of body whorl witli spiral sculpture only ; uniform 

 che-tnnt color. Length, 1:J-1."> mill. 



Europe, Canary Islam I*. 



The >ynonymy includes J5. 8C>i/>rinii, Olivi, II. /imn. r>i-ii-.. 



Ji. Lutriillii. 1'ayr., B. granuloSUm, Kisso, ]>. nniini/hifnnt, Ki.-so. /,'. 



<iiii/ii.-'tiiiii. De-li.. /!. /> i-rii'/i'ii'inii, Midd., B. vtifyatitxinia, (Mark, 



II. (I'ruin, Saiidri. }l. //////>//////////, Pennant, II. I luniriini, lieck, 11. 



- wb., II. tpinOf 'filieri, l 



Hur,,ii, ( y, Dant/. et Dollf. , Moll. KMiissilloii) enumerate the fol- 

 h.wing varietie- ; which are however, scarcely entitled to varietal 

 rank : 



