364 



ARTICULATA. ANNELIDA. 



ORDER I. TUBICOLA.* 



IN these, the gill-tufts are attached to the forepart 

 of the body, a necessary arrangement, as the body 

 is enclosed in a tube, open only at the extremity. 



TUBICOLA. (Dentalium Entails, and Terebella Medusa.) 



This tube, which in some cases resembles the shells 

 of the Mollusca, among which, some (as the genus 

 Dentalium\ or Elephant's Tusk) have been placed 



s 



* Tuba, a tube, and colo, to inhabit. f Dens, a tooth,- 



I Since the above was in type, the author has been informed that 



Dentalium has been proved to be a true Gasteropod Mollusk, a fact of 



which he was not previously aware. 



