742 CLASS xn. 



striated, inequilateral, anteriorly truncato-rotundate, orbiculari- 

 trigonal or oblique, incrassated towards the points. 



Astarte danmoniensis Sow., Crassina danmoniensis LAM., Venus crassa- 

 tella BLAINV. Malac. PL 75, fig. 7. The fossil species are numerous in 

 the later secondary, and in the tertiary formations. Comp. DE LA JON- 

 KAIKE Note sur le genre Astarte, Memoires de la Soc. d'Hist. not. de Paris, 

 i. 1823, pp. 127131, PI. vi. 



Venus L. (exclusive of species). Cardinal teeth in some three 

 in each valve, in others four in left valve. Lateral tooth none. 

 Impression of mantle below the posterior muscular impression 

 deeply sinuate. (Animal Callista POLL) 



a) Cardinal teeth four in left valve, with fourth elongate, situated under 

 lunula, compressed, received in a foveola of right valve. 



Cytherea LAM. 



Venus lusoria, Cyfh. lusoria LAM., Venus cliione L. (in part), EUMPH. 

 Ami. Rariteitlc. Tab. XLII. fig. G, EncycL meth., Vers. PI. 270, fig. i. The 

 Chinese and Japanese cover the inside of these shells with gold and colours, 

 and use them in a certain game. Venus Dione L., EUMPH. Amb. Raritcitk. 

 Tab. XLVIII. fig. 4, Encycl. meth., Vers. PI. 275, fig. i, HOUTTUYN Nat. 

 Hist. I. 150 Stuk, PL 117, fig. 6; East Ind. Seas. This species is described 

 by LINNAEUS in detail and metaphorically, Syst. nat., ed. 12, i. p. 1129, &c. 



b) Cardinal teeth three in each, valve, approximate. 



Venus LAM. 



Sp. Venus plicata GM., LAM. ( Venus Dysera L. in part), D'ABGENV. Con- 

 chyl. Tab. 21, fig. K, Encycl. meth., Vers. PL 275, fig. 3; Venus papilio- 

 nacea LAM. (Venus rotundata~L.) } Cov. R. Ani., ed. ill., Moll. PL 104, 

 fig. 4, &c.i 



Cyprina LAM. Shell obliquely cordate, thick. Hinge with 

 three unequal teeth, and lateral tooth remote, posterior, situated 

 under the fissure. Impression of mantle rotundate, entire. (Ani- 

 mal with tracheaa short, scarcely porrect beyond the margin of 

 shell.) 



Sp. Cyprina islandica LAM., Venus islandica L., MUELL. Zool. Danic. Tab. 

 28, BLAINV. Malac. PL 70 bis, fig. 5, Cuv. R. Ani., ed. ill,, Mott. PL 102, 



1 The species belonging to the genus Venus (Venus and Cytherea LAM.) are so 

 numerous, that they make up nearly of all the known lamellibranchiata, so that this 

 genus much surpasses the genera Tellina, Cardium, Area, Ostrea and Pecten so rich 

 in species. 



