2m 



MALACOZOA. THOPIOPODA. LAMELLIBRANCHIATA. 



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

 thickness ten-twelftlis. 



Venus nigosa. Fenn. Brit. Zool, iv. 95. PI. 56, f. 50. — Venus 

 laminosa. Mont. Test. Brit, Suppl. 38, — Ortvgia subcordata. Leach, 

 Brown, Ilhistr. PI. (19) 36. f. ^14, 15.— Venus laminosa. Laskey, 

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

 Brit. Sb. PI. 4. f. 115. — Venus rugosa. Fiem. Brit. Anira, 446. — 

 Venus Pennantii. Forbes, Malac. Men. 52. 



B. Venus Gallina strldtida. Common Hen Venus. 



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

 trically silicate, with the ridges reflexed, rather crowded and 

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

 innbones, 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, 

 w'ith nimierous 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 mgosa. 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. Bi-it. 113. — Venus 

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

 Forbes, Malac. Mon. 52. 



4. Venus Prideauxidnct. Prideaux's Venus. 



Shell cordato-trigonal, suhovate, 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 sti-aight, 

 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- 



