MAZATLAN UNIVALVES 523 
667. PHYLLONoTUS NiTIDUs, Brod. 
Murex nitidus, Brod. Proc. Zool. Soc. 1832, p. 175.—Sow. Conch. 
Ill. p. 6, no. 84, f. 4.—Rve. Conch. Ic. pl. 17, sp. 70. 
The shell figured by Sowerby was supposed by him, and by 
Kiener, (and may prove to be,) the young of M. princeps: that 
figured by Reeve more nearly resembles M. nigritus, jun. 
Whether it be really distinct must be decided by those who 
have examined a series. The solitary Mazatlan shell very 
closely approaches the extreme form in tablet 2481. It differs 
chiefly in the great prolongation of the shoulder frond. 
Long. 1°6, long. spir. 46, lat.*9, (+ spines *75,=1°65,) div. 95°. 
Hab.—Real lejos, Sowerby.—Guacomayo; on coral reefs at 
low water ; Cuming.—Mazatlan ; 1 dead sp. with M. nigritus ; 
LTpool Col. 
Tablet 2500 contains the specimen. 
668. PuyLLonotvus BRAssica, Lam. 
Murex brassica, Lam. An. s. Vert. vol. ix. p. 581, no. 33.— 
Potiez § Mich. Cat. Dowai. p. 418, no. 25.—Zool. Beech. Voy. 
p. 108, pl. 33, f. 1.—WSow. Conch. Ill. no. 80, f. 56.—Kien. 
Icon. Conch. p. 68, no. 49, pl. 26, and 27, f. 1.— Rve. Conch. Ic. 
pl. 14, f. 56.—Mzke. in Zeit. f. Mal. 1850, p. 187, no. 69. 
Murex ducalis, Brod. §& Sow. Zool. Journ. vol. iv, p. 377. 
This magnificent species was very rare in the L’pool Col. 
but not uncommon in the Havre Col. There are about 8 
varices denticulated, but scarcely expanded except at the base, 
where (and on the canal) are about 4 foliations. Behind the 
labrum are one large tubercle at the shoulder, and three or 
five below, open from within. Posterior canal foliated. Colu- 
mella slightly twisted ; anterior canal nearly covered, recurved, 
leaving a small umbilicus, labium separate. .Epidermis ex: 
tremely thin, ashy; mouth pinkish red. Surface densely 
crowded with extremely minute spiral granular lines. Oper- 
culum ovate, excurved, with a groove from the subcentral 
nucleus to the posterior end: interior side with laminze of 
‘growth; exterior with sharply raised laminz, not serrated: 
muscular scar spirally corrugated from the central nucleus : 
colour horny brown. Long. 7", long. spir. 2°, lat. (with tuber- 
cles,) 6°, div. 95°. , 
Hab.—Gulf of California; in rocky places, 4-6fm.; Mus. 
Cuming.—Mazatlan ; not uncommon; L’pool & Havre Coll. 
