162 POTAMIDES. 



C. RHIZOPORARUM, A. Ad. PL 33, figs. 67, 62. 



More robust and cylindrical than last species, with whorls not so 

 convex, with numerous rounded ribs cut into nodules by spiral 

 ridges, light yellowish brown, with chestnut lines, or a central pair 

 of them, or sometimes a single peripheral band ; apex decollated. 



Length, 1'33 in. 



Borneo and Philippines, on Mangroves. 



C. Quoyi, Hombr. et Jacq. (fig. 62), is a synonym. 



C. CORNEA, A. Ad. PL 32, fig. 55. 



Thin, obscure brown, rather distantly, smoothly, obliquely ribbed, 

 finely spirally striated, base of last whorl spirally striate, defined by 

 a peripheral ridge ; apex decollated. Length, 28 mill. 



Borneo, mouths of rivers. 



C. ORNATA, A. Ad. PL 33, fig. 64. 



Chestnut color, white banded below the suture, and below the 

 periphery of the last whorl, distantly, longitudinally, plicately 

 ribbed, scarcely spirally striate except on the base ; apex slightly 

 decollated. Length. 1-1*5 in. 



Philippines. 



C. FORTUNEI, A. Ad. PL 33, figs. 65, 66. 



Whorls well rounded, including the body whorl, sinuously longi- 

 tudinally ribbed, spirally striate on the base ; glaucous, banded with 

 brown, or all brown ; apex acute. Length, 11*5 in. 



Shanghai, China. 



C. SACRATA, Gould. PL 33, figs. 69-72. 



Epidermis thin, glaucous, under which the shell is chocolate 

 colored, often with a central narrow white band; longitudinally 

 ribbed, and occasionally thickly varicose, crossed by spiral ridges, 

 the crossings varying from nearly smooth to roughly tuberculate ; 

 apex usually entire. Length, 1'25 in. 



* Mazatlan to California. 



C. Calif ornica, Hald., is an earlier name for this species, but it 

 has not obtained currency. C. Mazatlanica, Carp. (fig. 70), is a 

 roughly sculptured, and C. pullata, Gould (fig. 71), an almost 

 smooth form. 



Var. ALBONOPOSA, Carp. Fig. 72. 



Shell smaller, with thick white varices. Length, 1 in. 



