474, MAZATLAN UNIVALVES 
Adams.—S. W. Mexico, P. P. C.—Mazatlan; abundant ; 
L’pool & Havre Coll. 
Tablet 2199 contains 5 sp. broad form.—2200, 9 sp. ordinary 
state.—2201, 5 do. rather more slender.—2202, 5 sp. slender 
growth.—2203, 3 sp. very slender.—2204, 2 sp. extremely acu- 
minate. 
Specimens shewing colour. Tablet 2205 contains 1 sp. reddish 
tinge, base light, acuminate, closely resembling A. hiatula.— 
2206, 2. sp. uniform olive grey.—2207, 3 sp. faint markings.— 
2208, 3 sp. highly coloured. —2209, 3 sp. columella deeply 
stained.—2210, 1 sp. parietal callosity not stained. 
Tablet 2211 contains 2 sp. columellar plaits twisted.—2212, 
1 sp. with slight parietal teeth.—2213, 5 sp. mended after 
fracture. , 
Famity PURPURID. 
Operculum ovate or somewhat elongated, with the nucleus in 
the middle of the outer margin: often irreyular in its edges, 
without external sculpture of growth, and resembling a chip 
of wood. 
Genus PURPURA, Zam. 
603. Purpura patuLa, Linn. 
Buccinum patulum, Linn. Syst. Nat. ed. 12, p. 1262.—Dillw. 
Deser. Cat. vol. 11. p. 609, no. 52. 
Purpura patula, Lam. An. s. Vert. vol. x. p. 61, no. 3.—Blainv. 
Nouv. Ann. Mus. vol.i. p. 224, no. 48.—Sow. Gen. f. 1.— Kien. 
Icon. Conch. p. 91, no. 57, pl. 24, f. 66.—Fve. Conch. Syst. 
vol. 11. p. 22, pl. 259, f.1:—Conch. Je. pl. 1, sp. 3—Mke. in 
Zeit. f. Mal. 1850, p. 180, no. 47. 
Le Pakel, Adans. Sen. pl. 7, f. 3. 
Purpura pansa, Gould, Mex. & Cal. Shells, p. 33. 
(For other references, v. Desh. in Lam. loc. cit.] 
This well known shell was not found by Prof. Adams; but 
Dr. Gould, having received some very young Pacific specimens, 
has endeavoured to find marks of specific difference between 
them and his Atlantic specimens. Having carefully examined 
many hundred Mazatlan shells, 1am entirely unable to coin- 
cide with Dr. Gould’s opinion; his diagnosis of the Atlantic 
type exactly fitting the majority of the Mazatlan specimens, 
