448 MAZATLAN UNIVALVES 
nodosa ; costa spirali alterd labio adjiciente ; totd 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. 
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°. 
Hab.—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. 
Famity NATICIDA. 
Gents NATICA, Adanson. 
Natica, pars, auct. Operculum shelly ; umbilicus twisted. 
Vide H. & A. Ad. Gen. vol. i. p. 204. 
570. Natica MAROcCANA, Chemn. 
Nerita maroccana, Chem. Conch. Cab. vol. v. p. 270, pl. 188, 
f. 1905—1910 :—ed. alt. pl. 3, f. 1O—13, 25, 26 :—icon. mel. in 
pl. 12, f. 1—5. 
Natica maroccana, Quoy & Gaim. Voy. Astr. vol. ii. p. 236, 
pl. 66, f. 16—19.— Koch in Zeit. f. Mal. 1844, pp. 151--155.— 
Dunk. Ind. Moll. Guin. p. 14, no. 35.— Uke. in Zeit. f. Mal. 
1847, p. 179, no. 6 :—do. 1849, p. 36, no. 2 :—do. 1850, p. 165, 
mo. 17s 
= Nerita marochiensis, Gmel. p. 3673, no. 15.— = Natica 
marochiensis, Rve. Conch. Ic. pl. 13, f.52 :—(non N. m. Lam. - 
An. s. Vert. vol. vii. p. 643, no. 25: = Nerita glaucina, 
Linn.=Natica intermedia, Phil. olim,=N. Poliana, Sacchi : 
teste Koch, loc. cit.) 
Var. a.=Natica lurida, Phil. (Chemn. f. 1909—10.) 
Var. b.=Natica unifasciata, Lam. loc. cit. p.'640, no. 19 :—Deless. 
Ree. Coq. pl. 32, f. 13 :—teste Koch ; non N.u. auct. nonnul.* 
* It is customary to name Natice 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, 
