CERITHIUM.— Plate XIII. 



Tliis species is characterized by deeply pitted interstices 

 between the ribs and rather sharp tubercles. 



Species 90. (Fig. a, h, Mus. Cuming.) 



Cekithium siphoxatum. Cerith. testri hmi, rur/om, 

 alba, varicosd, anfraclihm suhnngulalis, spirnliter 

 striatis, plicatis, ultimo hrevi, infra spiraliter bicodato , 

 aperlitrd parvd, canali longicaudato, recurvo. 



The siphoned Cekithium. Shell short, rough, white, 

 varicose, whorls i-ather angular, spirally striated, 

 plaited, the last short spirally double-ribbed below, 

 aperture small, canal long, recurved. 



SOWERBY. 



Hab. ? 



This is a very curiously sculptured and shaped white 

 species, with a veiy long upturned canal. 



Species 91. (Mus. Cuming.) 



Cekithium variabile. Cerilh. testa pared, breviusculd, 

 (/rined, niyro-tiiberculatd, anfractibiis subventricosis, 

 tuberculis tiigris ovalix in seriebiis tribiis fidlimo quin- 

 quej einclis, interslitiis minute tiibercidatis anfractit 

 nltimo siiborali, apertiird brerinscnln, canali brevi, 

 a per to. 



The variable Cekithium. Shell small, rather short, 

 grey, with black tubercles, wliorls rather ventricose, 

 girt with three (the last with five) rows of black 

 oval tubercles, interstices minutely tuberculated, last 

 whorl rather oval, aperturer ather short, canal short, 

 open. 



C. B. Adams. 



Hab. ? 



