492 MAZATLAN UNIVALVES 
617. CoLUMBELLA FuUSscATA, Sow. 
Proc. Zool. Soc. 1832, p. 117.—Sow. Thes. Conch. p. 114, no. 11, 
pl. 36, f. 21, 25.— Mill. Syn. Nov. Test. Viv. p. 88.—Desh. 
in Lam. An. s. Vert. x. 276, no. 22.—Mzke. in Zeit. f. Mal. 
1850, p. 184, no. 61.—C. B. Ad. Pan. Shells, p. 87, no. 86. 
=C. meleagris, Kien. Icon. Conch. p. 10, no. 7, pl. 3, f.3.— 
Duel. in Chénu, Ill. Conch. pl. 4, f. 15,16; ?+pl. 16, f. 13, 14, 
(1840.)—B. M. Cat. D’ Orb. Moll. p. 39, no. 344.—H. & A. 
Ad. Gen. i. 182. 
=Columbella rustica, pars, Sow. Gen. f. 3.—Comp. Val. Rec. 
Obs. vol. ii. p. 329. 
Extremely like the Mediterranean C. rustica; from which 
itis 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 1s 
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 ‘Ll. The smallest adult shell measures ‘67 by '37; aslender 
sp. measures long. 1°04, long. spir. °35, lat. °53, div. 60°. 
A broad Sp. 9 *85, ” "24, 33 “54, 99 80°. 
ffab.— Common, under stones, at Panama, St. Elena and 
Monte Christi; Cuming.—Payta, Peru, D’ Orbigny.—Taboga; 
under stones a little above low water mark, small and very 
rare; C. B. Adams.—Acapulco, Lesson.—San Blas, 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. 
