MAZATLAN UNIVALVES 515 
Tablet 2438 contains a very young sp. ‘64 long, with opercu- 
lum, and long canal. 
Tablet 2439 contains 6 sp. normal form.—2440, 7 sp. smooth 
form, transverse.—2441, 10 sp. do. elevated.—2442, 9 sp. ribbed 
form, elevated.—2443, 9 sp. do. transverse.—2444, 5 sp. umbili- 
cated rough var.—2445, 3 sp. recovered from severe fractures.— 
2447, 2 do. encrusted with Bryozoa.—2448, 1 do. epidermis 
orange. 
Tablet 2449 contains 12 normal opercula.—2450, 6 do. repair- 
ed after fracture, generally with central nucleus. 
660. Pisanta (P PAGODUS, var.) @QUILIRATA, 
P. t. “P. insigni” simili, sed multo minore, anfr. valde 
tumentibus, costis validis ad basin continuis, liris equalibus 
cinctd quarum v. in spird monstrantur ; plicd columellari 
basalt angulatd. 
Comp. Buccinum pagodus, Rve. Conch. Ic. pl. 7, sp. 50.— 
C. B. Ad. Pan. Shells, p.70, no. 61.=Cantharus pagodus, 
HI. & A. Ad. Gen. i. 85. 
One dead specimen was found, differing from the most 
dwarfed varieties of P. insignis in the above characters. It is 
of a uniform reddish brown, and apparently had very fine 
striule between the ribs. It is at once known from P. gem- 
ata by the tumidity of the whirls. It has the general aspect 
Buccinum biliratum, Rve. Conch Lc. pl. 10, sp. 71 (Galapagos, 
uming), but differs in sculpture. It may be a dwarf B. 
igodus ; but the Cumingian type is not at present accessible ; 
id it is rarely safe, in critical cases, to identify from the 
sures and descriptions in the Conch. Jc. alone. Long. *98, 
ng. spir. °45, lat. °54, div. 50°. 
‘ab.— Mazatlan ; 1 dead sp.; L’pool Col. 
Tablet 2451 contains the specimen. 
661. PrsantaA GeMMATA, Jve. 
uccinum gemmatum, Rve. Conch. Ic. pl. 7, f. 49.—Mzke. in 
Zeit. f. Mal. 1850, p. 179, no. 42. 
Buccinum gemmulatum, AWzhe. loc. cit. 1847, p. 180, no. 12. 
Buccinum undosum, fem. (Linn.) Kien. Icon. Conch. p. 39, 
no. 40, pl. 12, f. 41 (pars): v. Desh. in Lam. An. s. Vert. 
vol, ix. p. 642, no. 31, not. (1). 
