382 MAZATLAN UNIVALVES 
‘This fine and graceful species appears to replace S. gigas on 
the W. coast of N. America, as S. Peruvianus does on the 
Pacific shores of S. America. When very young, the spire is » 
fusiform, with spiral striz and transverse folds asin Fuside 
(Colide, Gray.) Gradually the whirls lose their sculpture, 
and envelop each other, with a broad channel below the suture 
and an obtuse angle near the periphery. Beneath this are 
developed more or less faint obtuse spiral ribs, ending in slight 
crenations of the but-moderately expanded outer lip. Pos- 
terior channel narrow, ascending the spire. Epidermis de- 
ciduous, nearly smooth. Menke has described the operculum 
as like that of 8. gigas, lancet-shaped, slantingly elliptical, 
with a keel-shaped line near the middle. It is figured in 
Hi. & A. Ad. Gen. i. pl. 27, f.1a.1b. The entire stock of this 
beautiful shell in the L’pool Col. shared the fate of the Spondyli 
and large limpets. The specimens here displayed are from the 
Havre Col. Long. 8°5, long. spir. 1°2, lat. 6°3, div. 90°. 
Hab.—-Gulf of Nicoya, on reefs at low water, Cuming=Taboga’ 
(fragments) C..B. Adams.—S. W. Mexico, P. P. C.— 
Mazatlan: not uncommon; L’pool & Havre Coll. 
Tablet 1821 contains a young specimen, in perfect condition, 
6°5 in length.—1822, a fine adult specimen. 
448. STROMBUS GRANULATUS, Swains. 
Bligh Cat. App. p.8.— Wood Ind. Test. Suppl. pl. 4, f. 21.— 
Swains. in Hanl. Exot. Conch. p. 36.— Sow. Thes. Conch. 
p. 33, no. 39, pl. 9, f. 100.— Kien. Icon. Conch. p. 28, pl. 22, 
f. 1—Lam. An. s. Vert. vol. ix. p. 713, no. 37.— Duel. in 
Chen. Ill. Conch. pi. 11, f. 5. 6.—Kust. Conch. Cab. p. 64, 
pl. 13, f. 138.—Rve. Conch. Ic. pl. 14, f. 32.—C. B. Ad. Pan. 
Shells, p. 113, no. 124.—MWke. in Zeit. f. Mal. 1851, p. 21, 
no. 93. 
This well-known species appears to abound in the warmer 
latitudes, but not to flourish at Mazatlan. It is easily recog- 
‘nized by its elevated spire, very stout nodules, and variegated 
painting. Epidermis rather rough, adherent. Long. 3°44, 
long. spir. °96, lat. 1°64, div. 50°. 
Hab.—St. Elena and Galapagos ; sandy mud, 6-8 fm. ; Cuming. 
—Panama, Col. Jewett.—Taboga, 7 dead sp. C. B. Adams.— 
