MAZATLAN UNIVALVES 527 
no. 136.—MWke. in Zeit. f. Mal. 1850, p. 188, no. 72. 
= Murex aculeatus, Wood, Ind. Test. Suppl. pl. 5, f.19, (non 
Lan.) 
One adult specimen only was found, in exquisite condition. 
It is more elevated even than Sowerby’s figure, and only has a 
general resemblance to that of Reeve. It seems nearer to 
Pisania than to Murex; not having any varical lines, and 
presenting a toothed mouth. There are 7 tubercular ridges, 
crossed by very numerous minutely imbricated, spiral strie : of 
these seven are larger than the rest, not imbricated, of which 
two, the second very angular, shew on the spire. Colour black 
brown, black on the tips of the tubercles, with an extremely 
thin epidermis. Labrum with hollowed varix, and five tuber- 
cles within. Columella with two plaits (as far as the eye 
ean reach) of which one bounds the canal, the other ends in a 
tubercle. No parietal plait or posterior canal. Operculum 
unknown. Long. 1°06, long. spir. ‘53, lat. *6, div. 50°. 
Hab.—Panama, Cuming.—Do. not uncommon, under stones 
near low water mark; C. B. Adams.—Mazatlan; 1 fresh 
sp. adult, and 2 young shells ; Z’pool Col. 
Tablet 2508 contains a young shell, °36 by *24, which appears 
like the spiny depressed form figured by Reeve. It may how- 
ever prove to be the young of M. lappa. 
Tablet 2509 contains the adult specimen. 
674. MuRicIDEA PERINACEOIDES, vai’. INDENTATA. 
Murex erinaceoides, Val. Rec. Obs. vol. ii. p. 302. 
Comp. Murex alveatus, Kien. Icon. Conch. p. 24, pl. 46, f. 2.— 
Rve. Conch. Ic. pl. 32. sp. 157, f. 157, 163. 
M. t. elevatd, angusta, alba, fusco strigatdé et maculaté ; 
varicibus il. veris et 11. falsis, intermediis, rotundatis, supra 
suturam continuts, lineis vi. subspiralibus, ad apicem ascenden- 
tibus ; suturd ad interstitias profunde indentatis ; costulis 
spiralibus, juxta varices valde indentatis, et striulis exillimis, 
minimis, confertissimis, ornatad; labro intus lirulis vi., labio 
* continuo, levi; canali haud elongato, solido. 
The description of Val, is not sufficiently minute to identify 
this species with certainty. Only one dead shell was found in 
the L’pool Col., and two others were obtained from a shop. 
Jt has the general aspect of the common forms of M. erinaceus ; 
but is known by the extremely minute spiral striation, and the 
