MAZATLAN UNIVALVES 523 



667. PSTLIONOTUS NITIDUS, Brod. 



Murex uitidus, Brod. Troc. Zool. Soc. 1832, p. 175. — Sow. ConcJi. 

 III. p. 6, no. 84, f. 4.— i^we. Conch. Ic. pi. 17, sp. 70. 



The sliell figured by Sowerby was supposed by bim, and by 

 Kiener, (and may i)rove to be,) tke young of M. princeps : tbat 

 figured by Eeeve 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 difiers 

 chiefly in the great prolongation of the shoulder frond. 

 Long. 1'6, long. spir. "46, laf. "9, ( + spines ■75, = 1'65,) div. 95°. 



Sab. — Ileal Llejos, Sowerby. — Guacomayo ; on coral reefs at 

 low water ; Cuming. — Mazatlan ; 1 dead sp. with M. nigritus ; 

 TJpool Col. 



Tablet 2500 contains the specimen. 



668. Phyllonotus beassica, Bam. 



Murex brassica, Lam. An. s. Vert. vol. ix. p. 581, no. 33. — 



JPotiez ^ Mich. Cat. Douai. p. 418, no. 25. — Zool. Beech. Voy. 



p. 108, pi. 33, f. l.—Soio. Conch. HI. no. 80, f. bQ—Kie7i. 



Icon. Conch, p. 68, no. 49, pi. 26, and 27, f. 1. — Rve. Conch. Ic. 



pi. 14, f. oQ.—Mke. in Zeit.f. Mai. 1850, p. 187, no. 69. 

 Murex ducalis, Brod. Sf Soiv. Zool. Journ. vol. iv, p. 377. 



This magnificent species was very rare in the L'pool Col. 

 but not tmcommon in the Havre Col. There are about 8 

 varices denticidated, 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 iimbHicus, 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 tlie subcentral 

 nucleus to the posterior end : interior side with laminae of 

 growth ; exterior with sharply raised lamina;, 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^*. 



Sah. — Gulf of California ; in rocky places, 4-6 fm. ; Mus. 

 Cimiing. — Mazatlan ; not imcommon ; L'pool ^ Havre Coll. 



