MAZATLAN UNIVALVES 517 
662. PIsANIA SANGUINOLENTA, Ducl. 
Purpura sanguinolenta, Duci. in Guer. Mag. Zool. pl. 22, f. 1, 
1833. 
Buccinum sanguinolentum, Mke. in Zeit. f. Mal. 1847, p. 180, 
no. 11.—C. B. Ad. Pan. Shells, p. 72. no. 64. 
Pollia hemastoma, Gray, Zool. Beech. Voy. p. 112, 1839. 
Buccinum hemastoma, Rve. Conch. Ic. pl. 7, f. 46. 
Buccinum Janelii, Val. Voy. Ven. Moll. pl. 6, f. 1, la-c. 1846. 
Tritonium verrucosum, JMke. ms. loc. cit, 
(Cantharus) Tritonidea sanguinolentus, H. & A. Ad. Gen. i. 85. 
This extremely beautiful species is constantly distinguished 
from P. gemmata by its small size, colour, and details of sculp- 
ture. The three nuclear whirls are smooth and subtransparent ; 
the succeeding ones, as in P. gemmata, but less indented. The 
last two have in the middle.of each whirl about nine elongated 
projecting tubercles rather than ribs, with a broad depression 
between these and the subsutural granulose line. Spiral sculp- 
ture faint except on the tubercles, where the narrow tips of the 
principal hrule are brownish red: between each are 6-8 fine 
striule. Hpidermis very thin, deciduous. Surface frequently 
encrusted with Bryozoa, Annelids, and very rarely with cor- 
aliine. One young fresh specimen was found on Spondylus. 
Labrum as in Pisania gemmata, with a very stout tubercle - 
behind the posterior canal: inside more or less grooved, ending 
in sharp serrations, generally projecting in pairs between the 
principal lirulse. Columella with one Fasciolaroid fold. Labium 
covered all along with numerous warts, white on a blood-red 
ground, which vary in shape and size. Canal short. Colour 
a prevailing greenish brown, with brownish red on the tips 
and round the mouth. Operculum seareely differing from that 
of P. gemmata, but rather flatter, with the external groove 
scarcely marked. An adult, which appears as if the animal 
had been starved, with the tubercles scarcely developed, 
measures long. ‘72, long. spir. ‘25, lat. °44, div. 60°. 
Anunusually large sp. 1°26, i See sic Opt cals ReneN dees 
Hiab.—Panama; under stones at low water; Cuming.—Do. ; 
. and Taboga, same station, and probably lower, very rare ; 
C. B. Adams.—Mazatlan ; rare; L’pool Col. 
Tablet 24651 contains 5 sp. in process of ¢growth.—2462, 4 sp. 
adult, different sizes.—2463, 3 sp. encrusted.—2464, 3 opercula, 
of which one is ovate, distorted, nucleus subcentral. 
April, 1857. ww 
