480 MAZATLAK UNIVALVES 



Purpura speciosa, Hve. Conch. Ic. pi. 11, f. 56. — Vol, Sec. 



0^5. vol. ii. p. 316, (1833.) 

 (Purpura) Thalessa speciosa, JT. Sf A. Ad. Gen. i. 127. 

 = Purpura centiquadra, Val. ms. 



The species was described by BlainvOle from a single young 

 specimen brought from "California" by M. Botta. Although 

 not figured, its recorded analogy with the W. Indian P. del- 

 toidea, orange mouth, and numerous close violet bands of 

 colour, leave no doubt of the identity of the shell. It is said 

 to be finely striated at the base, but this character may be 

 accidental. The three rows of nodules are generally seen in 

 the young shell, but often only one appears on the adult. The 

 violet bands are broken up into rectangular dots. The labrum 

 is not toothed, but sometimes finely serrate at the margin. 

 Operculum purple black, with lighter wings : outside very 

 glossy. Scar very finely corrugated transversely, with the 

 few lines of growth somewhat rectangular. Most of the speci- 

 mens are about an inch long: a giant measures long. 1'82, 

 long. spir. '58, lat. 1'46, div. 90". 



Sah. — Acapulco, JSumholdt Sf Bonpland. — Mazatlau ; 1 young 

 sp. ; Botta. — Do. ; rare, generally incrusted with coralline ; 

 L'pool Col. 



Tablet 2248 contains 3 sp. triserial. — 2249, 3 do. with two 

 rows becoming obsolete. — 2250, the largest specimen. — 2251, 

 2 separate opercula ; two others are in situ in the shells. 



608. PUEPUEA TEIANGULAEIS, Blainv. 



Monogr. Purp. in Nouv. Ann. Mus. vol. i. 1832, p. 223, no. 46 

 (bis), pi. 11, f. 4, (t. jun.) — Desk, in Lam. An. s. Vert. vol. x. 

 p. 115, no. 82. 



Purpura Carolensis, Rve. Conch. Ic. pi. 11, sp. 57, 1846. — 

 C. B. Ad. Pan. Shells, p. 76, no. 69. 



(Purpura) Tribulus Carolensis, H. Sf A. Ad. Gen. i. 126. 



The solitary young specimen brought by M. Botta from 

 Mazatlan, and figured by BlainviUe, was overlooked by Mr. 

 Reeve, who named it from Charles Is., Galapagos, whence it 

 was brought by Mr. Cuming. It is easily distinguished from 

 P. triserialis by its more rounded outline, white mouth, double 

 row of tubercles, infrasutural spiral rib forming a slight pos- 

 terior canal, finely plaited labrum, 4-dentate internally, labium 

 finely corrugated near the base, and siirface crowded with 



