150 LITTORINIDiE. 



Cingula denticulata, Fleming, Brit. Anim. p. 306. — Brit. Marine Conch, p. 771- 

 Rissoa ,, Brown, Illust. Conch. G. B. p. 1 1 (pi. i), f. 80 ?). 



A conic, subpellucid, white shell, with six volutious terminat- 

 ing in an obtuse point, furnished with nine or ten coarse ribs, 

 that project at the top of each spire, forming strong indentations 

 like the preceding species (^conifera) ; aperture suborbicular, 

 outer lip thickened by a rib ; pillar-lip smooth, indented with 

 one or tvvo small tubercles at the base adjoining the ribs. 

 Length not quite a quarter of an inch ; breadth one-half its 

 length. 



Supposed to he exotic, but is 7iot known to us. Stated to have 

 been received by Montagu from Weymouth (that once prolific 

 source of spuriously native species), along \oith conifera, and to 

 bear much general likeness to that shell, yet to differ from it by its 

 more conic shape, its fewer and stronger ribs, which form deeper 

 sutural dent icidat ions, are not undulated bid simply oblique, and 

 are separated by smooth intervals ; and by its more orbictdar, and 

 not truly marginated but simply thickened aperture. The various 

 descrip)tions of this shell appear to be derived from the original one 

 in the " Testacea Britannica," but both Wood and Brown have 

 delineated a shell under this appellation. The minuteness of the 

 scale on which the former has exhibited the species is an effectual 

 bar to the 7'ecognition of the object intended ; the other engraving 

 referred to displays a shell that seems allied most closely to 

 Bryerea, bid is shorter and less closely ribbed, and agrees very 

 fairly with a Jamaica sj^ecies called subangulata by our friend, 

 Professor Adams, in his correspondence. The tubercles zipon the 

 pillar referred to by Montagu are neither p>resent in that shell, nor 

 delineated in Brown's engraving : hence ive dare not assert the 

 identity of the figured specimen ivith Montagus lost type. 



