MAZATLAN UNIVALVES 477 
Hab.—St. Elena, Cuming.—Mazatlan ; extremely rare; L’pool 
& Havre Coll. 
Tablet 2230 contains one of three very small shells, contain- 
ing 5 nuclear whirls, remarkable for two very fine spiral keels 
and a shagreening of the surface, and (in this specimen alone) 
for a long process from the labrum not seen afterwards. The 
normal portion displays a sculpture which may develop into 
P. muricata. 
Tablet 2231 contains an adult sp. with Bryozoa, &e. 
606. Purpeura BISERIALIS, Blainv. 
Blainv. Monogr. Purp.in Now. Ann. Mus. vol. i. p. 238, no. 75, 
 pl.il, fi 1l—Wke. in Zeit. f. Mal. 1850, p. 180, no. 49.— 
(Non. Hanl. in Rve. Conch. Ic. pl. . sp. . 
= Purpura bicostalis, Ave. Conch. Ic. pl. ,sp. 28.—Mke. 
loc. cit, p. 181, no. 50.—P. P. C., Cat. Prov.—(Non Blainv. 
loc. cit. p. 238, no. 76:—? Lam. An. s. Vert. vol. x. p. 82, 
no. a D Orb. B. M. Cat. Moll. p. 42, no. 865, [? +356 
pars. | ) 
=Purpura undata, Val. Rec. Obs. vol. ii. p. 315.—C. B. Ad. 
Pan. Shells, p. 80, no. 76:—non Lam. An. s. Vert. p. 67, 
no. 10:—D’ Orb. B. M. Cat. Moll. p. 42, no. 364. 
?Var.=Purpura undata, Hyd. & Soul. Voy. Bonite, pl. 39, 
f. 17—19 :—B. M. Cat. p. 24, no. 192. 
+ Purpura hemastoma, Mike. in Zeit. f. Mal., 1847, p. 182, 
no. 15.—Comp. Buccinum hemastoma, Linn., Syst. Nat. 
p. 1202. 
+ Purpura consul, Whe. loc. cit. 1850, p. 180, no. 48.—(Non 
Lam. loe. cit. p. 63, no. 6.) 
Comp. Purpura hematura, Val. Voy. Venus, pl. 8, f. 3, 3a. 
Comp. P. Floridana, Conr. Journ. Ac. Nat. Se. Phil. vol. vii. 
pt. 2, 1837, p. 265, pl. 20, f. 21. = P. hemastoma, D’ Ord. 
B. M. Cat. Moll. p. 41, no. 356, (maxima pars.) 
M., Blainville having described this shell from (young) Maz- 
atlan specimens, brought by MW. Botta, at the same time stating 
that it represents P. hamastoma on the W. Coast of America, 
‘‘differmmg in its smaller size, and by its constantly having 7 
pliciform tubercles on the labrum” (the figure however pre- 
senting 8), there can hatdly be a doubt that his species is that 
here intended, and not the shell attributed to it by Messrs. 
-Hanley and Reeve, which has but a remote resemblance to 
Blainville’s figure. 
