266 



MALACOZOA. TROPIOPODA. LAMELLIBRANCHIATA. 



red. Length an inch and a-half, height an inch and a-fourth, 

 thickness ten-twelfths. 



Venus rugosa. Penn. Brit. Zool. iv. 95. PI. 66. f. 50. Venus 

 laminosa. Mont. Test. Brit. Suppl. 38. Ortygia subcordata. Leach, 

 Brown, Illustr. PI. (19) 36. f. 14, 15. Venus laminosa. Laskey, 

 Wern. Mem. 1. 384. PI. 8. f. 16, 16. Venus cancellata. Donov. 

 Brit. Sh. PL 4. f. 115. Venus rugosa. Flem. Brit. Anim. 446. 

 Venus Pennantii. Forbes, Malac. Mon. 52. 



B. Venus Gallina striatula. Common Hen Venus. 



Shell cordato-trigonal, thick, moderately convex, concen- 

 trically sulcate, with the ridges reflexed, rather crowded and 

 imbricated, thick-edged or rounded, more distinct toward the 

 umbones, where their intervals are concentrically, and more or 

 less radiatingly striate ; the frontal slope short and concave, with 

 a sunk cordato-oblong impression ; the posterior slope half as 

 long again as the anterior, somewhat convex, with the impres- 

 sion lanceolate, flattened, glossy, and finely striulate on the 

 left valve, rugoso-striate and dullish on the other ; the mus- 

 cular impressions moderately sunk ; the colour reddish-white, 

 with numerous interrupted red lines, giving the ridges a reti- 

 culated appearance, and generally three darker radiating 

 bands ; the anterior slope variegated with red on both sides. 

 Length an inch and a-fourth, height an inch, thickness from 

 seven to eight-twelfths. 



Venus Gallina. Linn. Syst. Nat. 1130. Venus rugosa. Var. 

 Penn. iv. Venus striatula. Donov. Brit. Sh. PI. 68. Venus Gal- 

 lina. Turt. Brit. Biv. 149. PI. 9. f. 2. Ortygia Gallina. Leach, 

 Brown, Illustr. Venus striatula. Mont. Test. Brit. 113. Venus 

 Gallina. Lamk. Syst. v. 591; Ed. 2. vi. 348. Venus Gallina. 

 Forbes, Malac. Mon. 52. 



4. Venus Prideauxidna. Prideaux's Venus. 



Shell cordato-trigonal, subovate, rather thin, or thin, con- 

 centrically sulcate, with the ridges thin, reflected, thin-edged, 

 distinct, being separated by intervals of about their own 

 breadth, which are more or less concentrically and radiatingly 

 striate ; the frontal slope short and very concave, with a sunk 

 cordato-oblong, sulcate impression ; the posterior slope straight, 

 more than half as long again, with the impression narrow- 

 oblong, smooth and glossy on the left valve, rugoso-striate on 

 the other; the muscular impressions faint; the colour ge- 

 nerally white, with three dark purple radiating, usually inter- 



