448 MAZATLAN UNIVALVES 



nodosd; costa spirali alter a labio adjiriente ; iota superficie 

 minutissime decussatd ; labro a costis sinuato. 

 Comp. Scalaria diadema, Sow. 



This shell agrees with C. diadema in almost every particular, 

 down to the minute decussation of the surface. The remarkable 

 pupiform growth of the Peruvian shells however, contrasted 

 with the very regular spire (with one more whirl in proportion ) 

 of the Panama and Mazatlan specimens, is thought by Mr. 

 Chiming sufficient to separate the species. The Mazatlan shells 

 are not so large as those in Mr. Cuming's collection, whi ch 

 measure long. *7, long. spir. '47, lai. '34, div. 37. 

 Sab. Mazatlan ; 2 sp . only ; L'pool Col. Panama, 3 sp. ; 



T. Bridges in Mus. Cuming. 



Tablet 2041 contains one sp. with the mouth immature, 

 sinuated by both the spiral rope-like ribs. 



FAMILY JSTATICID^E. 

 GENUS NATICA, Adanson. 



Natica, pars, auct. Operculum shelly ; umbilicus twisted. 

 Vide H. $ A. Ad. Gen. vol. i. p. 204. 



570. NATICA MAROCCANA, Chemn. 



Nerita maroccana, Cliem. Conch. Cab. vol. v. p. 270, pi. 188, 



f. 19051910 : ed. alt. pi. 3, f. 1013, 25, 26 : icon. mel. in 



pi. 12, f. 1-5. 

 Natica maroccana, Quoy fy Gaim. Voy. Astr. vol. ii. p. 236, 



pi. 66, f. 16 19. Koch in Zeit. f. Mai. 1844, pp. 151-155. 



Dunlc. Ind. Moll. Gum. p. 14, no. 35. Mice, in Zeit. f. Mai. 



1847, p. 179, no. 6 : do. 1849, p. 36, no. 2 : do. 1850, p. 165, 



no. 17. 

 = Nerita marochiensis, Gmel. p. 3673, no. 15. = Natica 



marochiensis, Rve. Conch. Ic. pi. 13, f. 52 : (non IN", m. Lam. 



An. s. Vert. vol. viii. p. 643, no. 25 : = Nerita glaucina, 



Linn.=^siticsi intermedia, Phil. olim,=N. Poliana, Sacchi : 



teste Koch, loc. cit.) 



Var. a.=Natica lurida, Phil. (Chemn. f. 190910.) 

 Var. b. = Natica unifasciata, Lam. loc. cit. p,'64D, no. 19 : Deless. 



Rec. Coq. pi. 32, f. 13 : teste Koch ; non N. u. auct. nonnul* 



* It ia customary to name Naticae with one band N. unifasciata. Besides how- 

 ever the unifasciate var. of N. maroccana, there are other very distinct species. 

 Which was intended by Lam. cannot be told by the diagnosis alone. 



