448 MAZATLAN UNIVALTES 



nodosa ; costd spirali altera lahio adjiciente ; tola superjicie 

 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. 

 Cuming sufficient to separate the species. The Mazatlan shells 

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

 measure long. "7, long. spir. "47, lat. '34, div. 37°. 



Hah. — 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 NATICID^. 



Gentjs NATICA, Adanson. 



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

 Vide B:. ^- A. Ad. Gen. vol. i. p. 204. 



570. Natica" MAEOCCANA, Chemn. 



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



f. 1905—1910 :— ed. alt. pi. 3, f. 10—13, 25, 26 :— icon. mel. in 



pi. 12, f. 1—5. 

 Natica maroccana, Q,uo7i Sf Gaim. Voy. Astr. vol. ii. p. 236, 



pi. 66, f. 16— 19.— JEbc/i in Zeit. f. Mai. 1841, pp. 151--155.— 



Dunl: Ind. Moll. Guin. p. 14, no. Zo.—Mkc. in Zeit. f. Mai. 



1847, p. 179, no. 6 :— do. 1819, p. 36, no. 2 :— do. 1850, p. 165, 



no. 17. 

 = Nerita marochiensis, Gmel. p. 3673, no. _15. — = Natica 



marochiensis, Rce. Conch. Ic. pi. 13, f. 52 : — (non N. m. Lam. 



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



Z2?m. = Natica intermedia, Phil, ohm, = N. Poliana, Sacchi : 



teste Koch, loc. cit.) 

 Var. a. = Natica lurida, Phil. (Chemn. f. 19(X)— 10.) 

 Var. h. = Natica uuifasciata, Lam . loc. cit. p.'640, no. 19 .- — Deless. 



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



• It is customary to name Naticse with one band If. unifasciata. Besides how- 

 ever the unil'asciate var. of N. maroccana, there are other very distinct species. 

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



