526 MAZATLAN UNIVALVES 



culum closely resembling that of Ph. nigritus, but generally 

 more orange, and without the exterior serrated laminae. The 

 largest sp. measures long. 5 '5, long. spir. 2*, lat. 3 '3, div. 80. 

 Hob. Puerto Portrero, Cuming Mazatlan ; rare ; I? pool fy 

 Havre Coll. 



Tablet 2505 contains a remarkably clear specimen. 2506, the 

 largest, much incrusted. Both specimens have their opercula. 



SUBMENUS MUEICIDEA, Swains. 



Muricidea + Ocinebra, H. fy A. Ad. Gen. vol. i. p. 75. Varices 

 indistinctly marked off. 



672. MUEICIDEA ? LAPPA, Brod. 



Murex lappa, Brod. Proc. Zool. Soc. 1832, p. 177. Eve. Conch. 



Ic. pi. 30, f. 142. Mice, in Zeit.f. Mai. 1850^ p. 188, no. 71. 

 Comp. M. radicatus, Hinds in Proc. Zool. Soc. 1843, p. 128. 



Zool. Sulph. Voy. p. -9, pi. 3, f. 21, 22. Eve. Conch. Ic. pi. 31. 



f. 148. 

 Muricidea lappa. H. fy 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 in a 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. 

 Hob. (M. radicatus) San Bias ; in mud, 11 fin. ; Hinds. 



(M. lappa) St. Elena ; on a rocky bed, 12 fm. ;, Cuming. 



Mazatlan ; 1 sp. only ; L'pool Col. 



Tablet 2507 contains the specimen. 



673. MUEICIDEA DUBIA, Swains, 



Murex dubius, Sow. Conch. HI. no. 119, pi. 61, f. 23. Eve. 

 Conch. Ic. pi. 26, f. 116. C. B. Ad. Pan. Shells, p. 121, 



