492 MAZATLAN triTIVALVES 



617. COLUMBELLA FUSCATA, Sow. 



Proc. Zool. Soc. 1832, p. 117— -Sow. Thes. Conch.'v- 114, no. 11, 



pi. 36, f. 21, 2o..—Miill. Syn. Nov. Test. Viv. p. 88.— Des^. 



in Lam. An. s. Vert. x. 276, no. 2-2.—Mke. in Zeit. f. Mai. 



1850, p. 184, no. 61.— C. B. Ad. Pan. Shells, p. 87, no. 86. 

 = C. meleagris, Kien. Icon. Conch, p. 10, no. 7, pi. 3, f. 3. — 



Duel, in Chenu, III. Conch, pi. 4, f. 15, 16 ; ? + pi. 16, f. 13, 14, 



(1840.)— 5. M. Cat. D'Orb. Moll. p. 39, no. 344.— -ff. ^ A. 



Ad. Gen. i. 182. 

 = ColumbeUa rustica, pars, Sow. Gen. f. 3. — Comp. Val. Bee. 



Obs. vol. ii. p. 329. 



Extremely like the Mediterranean C. rustica ; from which 

 it is known by the epidermis, which in C. rustica is hairy, in 

 C. fuscata thin, and nearly smooth. Deshayes adds a number 

 of minute particulars, which seem to have been described from 

 a single specimen. It would be hard to distinguish small, 

 dead specimens, if mixed together. In general however it ia 

 much larger, with colour and pattern resembling C. major. 

 It does not vary much in outline. The opercula closely 

 resemble those of C. major ; but are smaller, and generally 

 broader in proportion, with the apex nearer the center of the 

 outer margin. The muscular scar is broader and the dark 

 stain more developed. The ovate abnormal states seem as 

 common as in C. major. A normal operculum measures "15 

 by "1. The smallest adult shell measures '67 by "37 ; a slender 

 sp. measures long. 1'04, long. spir. '35, lat. "53, div. 60". 



A broad sp. „ '85, „ "24, „ '54, „ 80". 



Sab. — Common, under stones, at Panama, St. Elena and 



Monte Christi ; Cuming. — Payta, 'Pcvn.D'Orbigni/. — Taboga; 



under stones a little above low water mark, small and very 



rare ; C. B. Adam's. — Acapulco, Lesson. — San Bias, Kiener. — 

 Mazatlan ; common and very fine ; L'pool Col. 



Tablet 2342 contains 5 sp. young, in 'different stages of 

 growth. — 2343, 7 sp. broad form. — 2344, 7 sp. ordinary state. — 

 2345, 7 do. rather narrower. — 2346, 7 sp. slender growth. 



Specimens shewing colour. Tablet 2347 contains 3 sp. uniform 

 olive epidermis. — 2348, 3 do. with one dark band. — 2349, 3 do. 

 with small spots. — 2350, 3 do. spots developed. — 2351, 2 do. 

 orange olive. — 2352, 2 sp . epidermis removed. 



Tablet 2353 contains 3 sp. with Bryozoa.— 2354, 1 do. with 

 egg cases. — 2355, 3 sp. mended after fracture. — 2356, 1 sp. with 

 operculum in situ. 



