526 MAZATLAN UNIVALVES 
culum closely resembling that of Ph. nigritus, but generally 
more orange, and without the exterior serrated lamine. The 
largest sp. measures long. 5°5, long. spir. 2°, lat. 3°3, div. 80°. 
Hab.—Puerto Portrero, Cuming.—Mazatlan ; rare; L’pool & 
Havre Coll. 
Tablet 2505 contains a remarkably clear specimen.—2506, the 
largest, much incrusted. Both specimens have their opercula. 
Suscenus MURICIDEA, Swains. 
Muricidea+ Ocinebra, H. & A. Ad. Gen. vol. i. p. 75.—Varices 
indistinctly marked off. 
672. MuricipEs ? nappa, Brod. 
Murex lappa, Brod. Proc. Zool. Soc. 1832, p.177.—Rve. Conch. 
Ic. pl. 30, f. 142.—M he. in Zeit. f. Mal. 1850, p. 188, no. 71. 
Comp. M. radicatus, Hinds in Proc. Zool. Soc. 1843, p. 128.— 
ate Sulph. Voy. p. 9, pl. 3, f. 21, 22.— Rve. Conch. Ie. pl. 31. 
. 148. 
Muricidea lappa. H. & A. Ad. Gen. i. 75. 
The solitary Mazatlan specimen appears intermediate be- 
tween the species above quoted. The last varix occupying the 
place of two, it is hard to say whether it has 5 or 6. The spire 
is rubbed, shewing ‘sharp angles at the varices. The last is 
very complex ; rising behind, with minutely imbricated scales, 
into sharp palmations, which have numerous layers one inside 
the other; in front are numerous additional rows, each shorter 
than the last, ending ina simple serrated margin, scarcely 
ribbed within. Labium very prominent, sharp, not reflected 
or plaited, rounded posteriorly. Shell white. Canal bent, 
almost covered in. Long. 1°, long. spir. °45, lat. *54, div. 50°. 
Thickness of last varix, *23. 
Hab.—(M. radicatus) San Blas; in mud, llfm.; Hinds. — 
(M. lappa) St. Elena; onarocky bed, 12fm.; Cuming.— 
Mazatlan; Isp. only; ZL’ pool Col. 
Tablet 2507 contains the specimen. 
673. MuRicIDEA DUBIA, Swains, 
Murex dubius, Sow. Conch. Ill. no. 119, pl. 61, f. 23.—Rve. 
Conch. Ic. pl. 26, f. 116.—C. B. Ad. Pan. Shells, p. 121, 
