474 MAZATLAIT UNIVALVES 



Adams.— S. W. Mexico, P. P. C— Mazatlan ; abundant ; 

 JL'2}ool Sf 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 sheioing colour. Tablet 2205 contains 1 sp. reddish 

 tinge, base Ught, 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, 



Fajiilt PUEPUEID^. 



Operculum ovate or somewhat elongated, with the nucleus in 

 the middle of the outer margin : often irregular in its edges, 

 without external sculpture of growth, and resembling a chip 

 of wood. 



Genus PUEPUEA, Lam. 



603. PuEPUEA PATULA, Linn. 



Buccinum patulum, Linn. Syst. Nat. ed. 12, p. 1262. — Dillw. 



Descr. Cat. vol. ii. i>. 609, no. 52. 

 Purpura patula, Lam. An. s. Vert. vol. x. p. 61, no. 3. — Blainv. 



Nouv. Ann. Mus. vol. i. p. 221, no. 48. — Soto. Gen. f. 1. — Kien. 



Leon. Conch, p. 91, no. 57, pi. 24, f. QQ. — Rve. Conch. Syst. 



vol. ii. p. 22, pi. 259, f. 1 -.—Conch. Lc. pi. 1, sp. Z.—Mke. in 



Zeit.f. Mai. 1850, p. 180, no. 47. 

 Le Pakel, Adans. Sen. pi. 7, f. 3. 

 Purpura pansa, Gould, Mex. Sf 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 spechnens, 

 has endeavoured to find marks of specific difference between 

 them and his Atlantic specimens. Having carefully examined 

 many hundred Mazatlan shells, I am entirely unable to coin- 

 cide with Dr. Gould's opinion ; liis diagnosis of the Atlantic 

 type exactly fitting the majority of the Mazatlan specimens. 



