CERITHIUM. 127 



C. ciERULEUM, Sowb. PI. 21, fig. 54. 



Solid, ventricose, finely spirally striate, with several spiral rows 

 of tubercles on the body whorl, the upper ones larger, and forming 

 an angle or shoulder ; ashy grey, maculated Avith chocolate. Length , 

 40 mill. 



Red Sea, Indian Ocean. 

 C. GuiNiACUM, Phil. PI. 22, figs. 55, 56. 



Lightly spirally striated, with large, distant, rounded, longitu- 

 dinal plicse, tumid near the suture, fading out on the body whorl ; 

 whitish, under a yellowish corneous epidermis. Length, 34 mill. 



Gabon coxintry, W. Africa (Philippi). 



In Keeve's Iconica the habitat of this species is said, on the 

 authority of Cuming, to be " Lord Hood's Island, coast of Guinea"! 

 C. Sandw^chense, Sowb. PI. 22, fig. 58. 



Whitish, spii-ally lirate, crossing strong, rounded longitudinal 

 ribs ; whorls 9, convex, suture margined. Length, 27 mill. 



Samhvich Islands. 



Described from a single, not fully matured specimen. Appears 

 related to the preceding species. 

 C. AEMULUM, Sowb. PI. 21, fig. 53. 



Shell turreted, Avith distant pinched up plications, and revolving 

 striie, appearing as though tessellated ; yellowish white, with con- 

 centric reddish or violaceous lines; Length, 45 mill. 



Cape Verd Is. 



The specimens obtained were fossilized but retained their color ; 

 and the shell is probably still living in the neighboring waters. 



C. TESSELLATUM, Sowb. PI. 22, fig. 59. 



Shell minutely regularly tuberculated, whitish, with chestnut 

 colored small tessellations, outer lip thick, crenulated. Length, 22 

 mill. 



Darnley's IsL, N. Australia. 

 C. ciRCiNATUM, A. Ad. PI. 22, fig. 57. 



Dark chocolate color, with filiform spiral, white grooves, rather 

 nodose between the grooves, distantly longitudinally plicate. 

 Length, 22 mill. 



IsL Mindanao, Philippines. 

 C. rxciNATUM, Gmel. PI. 22, figs. 60, 61. 



Shell with a superior row of pointed tubercles forming an angle 

 on the whorls, and two series of small nodules beloAv, on the body 



