MAZATLAN UNIVALVES 265 
vol. x. pl. 168, f. 1626—7 :—Dillw. Rec. Shells, p. 1018, 
no, 6 :—=Calyptrea (Trochatella) t. B. WZ. Cat. D’ Orb. 
Moll. p. 48, no 411 :—+ Patella trochoides, Dillw. loc. cit. no. 
7:— +Calyptrea Araucana, Less. (teste D’ Orb. Cat.) —~ 
?Jun.=Calyptrea dilatata, Sow. Gen. f.9, (non Crepidula 
d., f. 5.)—Calyptrea radians, (max.) Val. Voy. Ven. pl. 14, 
dvd se pl. 15, 4, 4. 
Of this beautiful species, besides the specimen here des- 
cribed, I have seen only one other, in the collection of T. 
Nuttall, Esq., from an unknown locality. It differs from the 
S. American T. radians, (also quoted from Benguela and St. 
Vincent, Guinea, on the authority of Dr. Tams ; and of which 
a remarkably conical variety is figured in Beechéy’s Voyage ;) 
and also from the Gulf species, T. spirata, in the great con- 
vexity of the whirls, which are so produced at the. shoulder 
that the sides of the suture form nearly a right angle. It ap- 
proaches most nearly to a fossil species from Dax, which 
however has the base still more concave. The Infundibulum 
Californicum, Hl. Ad., (Proc. Zool. Soc. 1851, p. 153,) which 
from its name might be supposed to have some connection, is 
a species of Polydonta, (Trochine.) Diam. °74, alt. ‘64, (cujus 
anf. ult. °48,) div. 110% 
Hab.—Mazatlan ; one fresh sp.; L’pool Col. 
Tablet 1316 contains the specimen. 
Genus GALERUS, Gray. 
_ Galerus, Humph. 1797 :—Gray, Proc. Zool. Soc. 1847, p. 157, 
no. 269 :— Phil. Handb. Conch. p. 187 :—H. & A. Ad. Gen. 
VOl.1, prawns 
Trochita (pars,) Schum. 1817.—Calyptrea (pars,) Lam. 1822.— 
Siphopatella (pars,) Brod. 1834.--Infundibulum, pars, J. 
Sow.—Trochatella, pars, .D’ Orb. 
Mitrula, Gray, 1821.—Trochilea, Swains. 1837. 
This genus is intermediate between Crepidula or Crucibulum, 
and Trochita. The shell is conical, slightly spiral, with a 
rapidly ascending spiral lamina, doubled in upon itself. Unfor- 
tunately, no very young shells were found of this section. The 
plane of the vertex is parallel to the base in all observed species. 
332. GALERUS coniIcus, Brod. 
8 
Calyptreea (Siphopatella) conica, Brod. Proc. Zool. Soe. 1834, 
p. 38:—Trans. Zool. Soc. vol.i, p. 202, pl. 27, f. 7.— Mill. 
July 1856. z 
