14 



extremity, and having a subarticulated longitudinal 

 dentated fissure the whole of its length. 



Siliquaria anguina. Siliquaria laevigata. 



muricata. lactea. 



CLYMENE. 



Savignys Manuscripts. 

 A thin slender tube, open at both ends, its external 

 surface incrusted with sand and fragments of shells. 



Clymene amphistoma. 



DENTALIUM. 



DEXTALIUM ELEPHANTIN UM. Linn. 



Mart. t. 1,/. 4 4.5 4. 

 Shells of this genus are well known from their re- 

 semblance to an elephant's tusk in shape: the shell is 

 a testaceous tube, nearly regular, slightly curved, and 

 gradually attenuated to the lower end, and open at 

 both extremities. Some species are longitudinally 

 ribbed, others with annular marks, probably indicat- 

 ing their progressional growth ; but the greater num- 

 ber air quite smooth on the rxterior. 



