MAZATLAN BIVALVES . 7 
no inconsiderable a portion of the collection.* These shewed 
great diversities of colouring; sometimes abounding in the 
typical dots, sometimes shewing the faintest traces of them. 
The dots were scarcely ever angulated, according to the de- 
scription and figures of Sow. The favourite trifurcate white 
mark at the umbos sometimes darts up long angular rays ; in 
other cases it is extremely small and irregular. Long. 2°5, 
lat 2°9, alt. 1°4. 
Hab.—Indian ocean, Lamarck.—China, Deshayes.—[? C. gra- 
phica] Japan, Dr. Sibbald, Mus. Cuming.—Mazatlan, very 
rare; L’pool Col. 
Tablet 317 contains 5 young valves, from the Chama and 
Spondylus washings, the larger of which I think certainly, the 
rest perhaps, belong to this species. 
Tablet 318 contains 2 adult specimens, one of which at least 
was from the box. 
Genus VENUS, Linn. 
Venus, ex parte, Linn., Lam., et auct. 
Chione, Megerle, 1811; Gray, 1847; Desh. B. M. Cat. Ven. 
p. 118; (non Gray, 1838.) 
101. Venus (Curong) entpia, Brod. & Sow. 
Venus gnidia, Zool. Journ. iv. 364.—Rve. Conch. Syst.. pl. 68, 
f.5.—? Gray in Zool. Beech. Voy. pl. 41, f.3.—Deless. Rec. 
de Coq. pl. 19, f.1, a, b—Hanl. Deser. Cat. p. 113, pl. 13, 
f.43: Wood's ‘Supol. pl. 13, f. 483.—Sow. Phes. ce p. 709, 
pl. 154, f. 25.—B. M. Cat. D Orb. Moll. p. 68, no. 606.— 
C. B. Ad. Pan. Shells, p. 269, no. 437. 
Chione gnidia, Desh. in B. M. Cat. Ven. p. 132, no. 41. 
This queen of Veneres flourishes in the greatest luxuriance 
and magnificence in the Mazatlan seas. Though the texture is 
not so delicate as that of Ch. amathusia, nothing can exceed the 
beauty of the concentric frills, which rise at various intervals 
generally perpendicular to the surface of the shell. On the 
back, they carry off the radiating furrows: on the front they 
are beautifully crenated. They generally rise into lamine 
(sometimes *23 long) which are occasionally bent up almost 
* Before I knew how much the species was divided, I distributed under this 
name in several of the Mazatlan collections (‘‘ Hab. incog.’’) specimens which 
properly rank under one of the other groups. 
