MAZATLAN UNIVALVES 527 



no. 136.--.affo. in Zeit.f. Mai. 1850, p. 188, no. 72. 

 = Murex aculeatus, Wood, Ind. Test. Suppl. pi. 5, f. 19, (non 

 Lam.) 



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 Eeeve. 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 striae : 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 

 can 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. 

 Hob. Panama, Cuming. Do. not uncommon, under stones 



near low water mark ; C. _R Adams. Mazatlan ; 1 fresh 



sp. adult, and 2 young shells ; It 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. MUBICIDEA PERINACEOIDES, var. INDENTATA. 



Murex erinaceoides, Vol. JRec. Obs. vol. ii. p. 302. 



Comp. Murex alveatus, Kien. Icon. Conch, p. 24, pi. 46, f. 2. 



Eve. Conch. Ic. pi. 32. sp. 157, f. 157, 163. 



M. t. elevatd, angusta, alba, fusco strigatd et maculatd ; 

 varicibus iii. veris et iii. falsis, intermediis, rotundatis, supra 

 suturam continuis, lineis vi. subspiralibus, ad apicem ascenden- 

 tibus ; suturd ad interstitias profunde indent atis ; costulis 

 spiralibus, juxta varices valde indentatis, et striulis exillimis, 

 minimis, confertissimu, ornatd ; labro intus lirulis vi., labio 

 continuo, lavi ; canali haud elongato, solido. 



The description of Yal. 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. 

 It has the general aspect of the common forms of M. erinaceus ; 

 but is known by the extremely minute spiral striation, and the 



