266 MAZATLAN UNIVALVES 
Syn. Nov. Test. Viv. p. 147.—(Calyptreea ce.) Lam. An. s. Vert. 
vol. vu. p. 630, no. 17.— C. B. Ad. Pan. Shells, p. 220, 
no. 333.—(C. Trochatella ce.) Mike. Zeit. f. Mal. 1851, p. 36, 
no. 126.—(Galerus c.) H. & A, Ad. Gen. i. 368. 
The nuclear vertex in this species is generally eroded ; but, 
when perfect, resembles that of G. Sinensis, about ‘02 across, 
not prominent, with the outer whirl enveloping the rest, apex 
not visible. The colour is of a beautiful pinkish brown, 
lustrous, uniform over the shell, and variously stained or spot- 
ted. The lamina makes a rapid ascent to the margin, is much 
flattened, with the inner edge elegantly rounded, recurved 
over from 3-4ths to 4-5ths of its breadth, and a third part of 
its length. The recurved part is open, but not swollen within. 
Long. 1°27, lat.1°17, alt. °66. 
Hab.—Xipixapi and Salango, attached to shells in deep water, 
Cuming.—Panama, very rare, C. B. Adams.—S. W. Mexico, 
P. P. C—Mazatlan; extremely rare; L’pool Col. 
Tablet 1317 contains 4 sp. of which the youngest is ‘O08 across, 
and the next is coloured as in C. lichen, Brod. 
333. GALERUS MAMILLARIS, Brod. 
Calyptrea (Siphopatella) mamillaris, Proc. Zool. Soc. 1854, 
p. 88:—TZrans. Zool. Soe. vol. i. p. 201, pl. 28, f. 5.—(Calyp- 
trea m.) Lam. An. s. Vert. vol. vii. p. 631, no. 18.—(Galerus 
m.) H. & A. Ad. Gen. 1. 368.—(Non C. Trochatellam. B. AZ. 
Cat. D’ Orb. Moll. p. 48, no. 412.) 
+ Calyptrea regularis, C. B. Ad. Pan. Shells, p. 224, no. 340 :— 
id. p. 320.—(Galerus r.) H. & A. Ad. Gen. 1. 368. 
=Calyptrea (Trochatella) Lamarckii, Mke. Zeit. f. Mal. 1847, 
p. 186, no. 37 :—id: 1851, p. 36, no. 125.—(Non Desh. Lam. 
An. s. Vert., vol. vii. p. 627. no. 9.) 
? + Calyptreea (Siphopatella) Lichen, Brod. Proc. Zool. Soc. 
1834, p. 37 :—Trans. Zool. Soc. vol. i. p. 201, pl. 28, f. 4.— 
(Calyptrea 1.) Lam. An. s. Vert. vol. vu. p. 630, no. 16.— 
(Galerus 1.) H. & A. Ad.i. 368.—(Teste B. M. Cat. D’ Orb. 
Moll. p. 48, no. 412, =“‘lorica” err. typ.) 
The specimens of G. mamillaris in the Cumingian collection 
vary greatly in colour and sculpture. Some of these, as well 
as G. licHen, closely resemble the young of G. conica. A 
microscopic examination of the nuclear vertices would pro- 
bably decide the question. The vertex of G. mamillaris is 
