130 TESTACEOUS MOLLUSCA. 



reddish at tlie beaks, and tinged with rose colour on the anterior 

 side ; aperture of the anterior side patulous : margins deeply 

 serrated. 2. — Indian Ocean. 



C. RiNGENS. Chem. f. 170.— 6?meZ. 3254.— J>. p. 119.— 

 Lam. 3.— Wood. G. C. t. 53./. 1, 2.—W. t. 5. /. 18.— A'norr. 

 4. t. 14. /. 3. — E. t. 296. /. 3. Roundish, ventricose, whitish 

 tinged with rose colour on the anterior side where the margin is 

 deeply serrated and gaping, with about twenty-six longitudinal ribs 

 which are unarmed, and the anterior ones somewhat keeled and 

 irregularly grooved on one side. Diam. 1. — Africa. 



C. AsTATicuM. Lam. 4. — C. Lima. Gmel. 3253. — W. t. 5. 

 f.m.~D. f. 110.— OA. /. 153, A.—B. t. 293. f. 2. Heart- 

 shaped, tumid, whitish or pale fulvous and the beaks tinged with 

 red, with numerous small ribs which posteriorly are edged with 

 short spines, anteriorly with recurved lamellae, which are furrowed 

 on one side ; margins serrated. If.. 2. — Nicohar Isles. 



C. Tenuicostatum. Lam. 5. — Del. t. 11../. 6. — C. I.f. 19, 

 36. Somewhat heart-shaped, whitish with the beaks rosy and 

 smooth, with nearly fifty unarmed ribs which are obsoletely im- 

 bricated anteriorly ; posterior depression indistinct, and the valves 

 shutting quite close. 2^. — Timor ami New Holland. 



C. FiMBRiATUM. Lam. 6. — Wood. G. C. t. 56./. 5. — Beechey. 

 Z. t. 42. /. \.—W. t. 5. /. 39. Somewhat heart-shaped, whitish 

 with the beaks rather violet, with thirty-six unarmed convex ribs, 

 which ai'e only lamelliferous at the apex, and not at all on the 

 posterior side; the margin fringed with crested lamellae; the pos- 

 terior depression oval, a callosity under the beaks. 1^. — Indian 

 Ocean ? 



C. Brasilianum. Lam. 7. — C. I. f. 60, Obliquely ovate, 

 smooth, ash colour, partially painted with longitudinal rufous lines, 

 and the anterior slope spotted with brown ; within chesnut, and 

 the margin toothed. 1. — Rio Janiero. 



C. Apertum. Chem^f. 181, 2, 3.— Lam. S.—Wood. G. C. t. 

 56. /. 2—W. t. 5. /. 35.— C. Virgineum. var. B. Gmel. 

 3253.— V. RuGATUM. B. j). \2b.—E. t. 296. /. 5. Somewhat 

 heart-shaped, inequilateral, the anterior end being produced and 

 gaping, pale fulvous, or whitish with the beaks tawny orange and 

 smooth, with narrow distant acute longitudinal ribs which are 

 flattened at the anterior extremity ; within stained anteriorly with 

 rose colour. 1|. — Jamaica. 



C. Papyraceum. Chem. f. 184.— C. I.f. 55, 6.— TF. t. 5. 

 f. 33. — Gmel. 3254. — D. p. 125. Somewhat' heart-shaped, thin, 

 brittle, pellucid, whitish, tinged with purplish red at the beaks, 

 nearly equilateral, with obsolete longitudinal striae ; slightly 

 gaping on the anterior side, posterior depression large and oval : 

 within spotted with purplish brown. If . . 1^. — Japan. 



C. BuLLATUM. Lam. 10.— Solen B. Lin. 1115. — D.p. 69. 



