GINGLYMACONCHA. VENERIDZ. 303 
the others ; the left valve has three divaricating teeth approxi- 
mating at their bases; there are no lateral lamellee ; the ante- 
rior cardinal tooth in each valve is simple. 
The tracheal tubes of the animal are united, equally broad 
and long, and are ciliated at their extremities. 
I have been induced to separate this genus from the genus 
Cytherea of Lamarck, not only from the difference in the teeth 
of the hinge, but from the difference of the animals themselves ; 
in his first division a. the anterior cardinal tooth is either chan- 
nelled or denticulated. 
1. CHIONE COCCINEA. 
Shells rather thick; the epidermis chestnut, very smooth, 
concentrically very finely striolated, and longitudinally striola- 
ted. Length four; height three inches. 
Venus chione, Lister, Conch. t. cclxix. f. 105; Linn. Syst. 
Naé. xii. 1131. no. 125; Chem. Conch. vi. t. xxxii. f. 343 ; 
Gmel. Syst. Nat. 3272; Pult. Cat. Dorset. 33. t. vi. f. 7; 
Poli, Test. Sic. ii. t. xx.; Donov. Brit. Shells, t. xvii. ; 
Mont. Test. Brit. 115; M. § R. Trans. Linn. Soc. vii. 84 ; 
Flem. Edinb. Encycel. vii. 94; Dill. Desc. Cat. 178 ; Turt. 
Conch. Dict. 239. 
Pecten glaber, Da Costa, Brit. Conch. 184. t. xiv. f. 7. 
Cytherea chione, Lam. Hist. Nat. des Anim. sans Vert. v. 
566. 
Inhabits the Atlantic, European, Mediterranean and Adriatic 
seas; it is not uncommon on the south and western coasts of 
Devon, and the southern coasts of Wales. 
2. CHIONE MINIMA. 
Shells rather thick, slightly compressed, very smooth and 
glossy, concentrically striated ; the epidermis flesh-coloured, 
with two red marginal spots and two white les diverging from 
the umbones to the inferior aspect, forming the letter V re- 
versed. Length a quarter of an inch; height three-eighths of 
an inch. 
Venus minima, Moné. Test. Brit. 121. t. 1m. f.3; M. & R. 
