MAZATLAN UNIVALVES 381 
Kiener thinks that to C. brevis should be united C. rigida 
and C. goniostoma; and certainly the species have a strong 
‘resemblance, as has also C. bicolor, Hinds. The Mazatlan 
shells, of eh some hundreds ove been examined, vary in 
the elevation of spire, in colour, sculpture, and in the angle of 
the aperture. Sometimes the labium is parallel to the axis, 
sometimes at an angle of nearly 30°. Sometimes the ribs are 
sharp, distant, and scarcely nodulous ; sometimes running into 
each other, with strong tubercles. Sometimes the shell is near- 
ly white, sometimes of a rich purple brown, or brown orange. 
The first two whirls are smooth, followed by one which is 
finely cancellated, not shouldered. The umbilicus varies in 
size, and is more or less sculptured. The largest specimen 
measures long. 1°04, long. spir."54, lat. *78. div. 80°. 
A slender sp. ,, 1°04, . 03 aire. bee ye 
A broad sp. __,, 8, és “Dis coyase JOA hae 
Hab.—Conchagua, San Salvador ; on sandy bottom, 8 fm. ;: 
Cuming. — Taboga; 1 sp. C. B. Adams.— Mazatlan; not 
uncommon; L’pool Col. 
Tablet 1814 contains 3 young sp.—1815, 3 sp. ordinary broad 
growth.—1816, 2 sp. acuminated.—1817, the largest sp. with 
the aperture only touching the penultimate whirl at the basal 
keel.—1818, 3 sp. shewing variations in colour.—1819, 2 sp. 
ribs distant. —1820, 2 do. close. 
Famity STROMBID-. 
Grnus STROMBUS, Linn. 
447. SPROMBUS GALEATUS, Swains. 
Phil. Mag. & Journ. 1823, p. 401.—Gray Deser. Cat. p. 2, 
no. 2.—Sow. Thes. Conch. p. 36, no. 54, pl. 10, f. 114.— Hien. 
Conch. Ic. p. 5, pl.2—Lam. An. s, Vert. vol. ix. p. 710, 
no. 33.—Ducl, in Chén. Ill. Conch. pl. 26, 27, f£. 1.—Kust. 
Conch. Cab. p. 13,.no. 5, pl. 4a, f. 1, pl. 46, f. 1, 2.—fve. 
Conch. Ic. pl. 3, sp. 3, f. 3.— Mike. in Zeit. f. Mal. 1851, p. 20, 
no. 92. 
Strombus galea, Wood, Ind. Test. Suppl 1828, p. 14.—pl. 4, 
f. 13, 14.—C. B. Ad. Pan. Shells, p. 111, no. 122. 
Strombus crenatus, Sow. Zank. Cat. 1825, App. p. xix. 
