MAZATLAN UNIVALVES 335 



haud magnorum sub suturam haud impressam : serie granulo- 

 riom parvorum ad peripheriam, in spird super suturam vix 

 monstrante ; altera minorum in hasi ; spird in medio anfrac- 

 tuum suhlcBvi ; lahro obscure bigonato ; canali anteriore longo, 

 recto, declivi, vix recurvato. 



= C. umbonatum, Sow. in. Mus. Cum. 



Comp. Cerithium musica, Vol. Bee. Obs. p. 277, (Acapulco.) 



This shell, named C. fameliciim by Mr. Cuming as from 

 C. B. Adams, does not agree with the description given by the 

 Professor; still less with that of C. uncinatum, to which Sow. 

 unites the species. It more nearly resembles the W. Indian 

 C. litteratum Brug. (Lam. An. s. Vert. ix. 303) but is much 

 more slender. Tt is characterized by the entire absence of the 

 stout tubercles in the middle of the whirls, by a smaller row at 

 the top, a still smaller at the bottom, and a yet smaller round 

 the base. The labrum has two obscure angles between the 

 canals. The glossy aspect of the shell is very characteristic 

 and beautiful. The young shell is like the adult, but with 

 obsolete ribs instead of tubercles. Long. '98, Long. spir. '67, 

 lat. -38, div. 25". 



Mab. — PTaboga, rare, C. B. Adams. — Mazatlan ; 1 fresh sp. ; 

 L'pool Col.—S. W. Mexico, do. P. P. C. 



Tablet 1587 contaias the specimen. 



383. Ceeithium ? uncinatum, Gmel. 



Murex uncinatus, Gmel. p. 3542, no. 57. — Dillw. Descr. Cat. 



vol. ii. p. 751, no. im.— Wood, Iml. Test. pi. 27, f. 150. 

 Murex, no. 198, Schroet. Einl. vol. i. p. 611. 

 Strombus muricatus et marmoratus, Schroet. Flusch. p. 379, 



pi. 8, f. 15. 

 Cerithium uncinatum Desk, in Lam. An. s. Vert. vol. ix. p. 315, 



no. 49.— So?^. Thes. Conch, pi. 180, f 79. 

 ? = Cerithium famelicum, C. B. Ad. (pars) loc. cit. 



This species suits with tolerable precision the very accurate 

 description of Desk., and in the main that of C. B. Ad. The 

 locality however of C. uncinatum is unknown, and it may be a 

 distinct though similar Caribbean species. In that case the 

 name C. famelicum may be retained for this shell and C. me- 

 diolseve for the Mexican. This is characterized by the row of 

 very stout tubercles ascending the spire in the middle of each 

 whirl ; with two smaller, closer rows, one just below the suture, 



