116 MR. GOSSE ON A NEW FORM OF CORYNOID POLYPES. 



Species, Lar Sabellabtjm (Gosse). 

 Species unica. L. tentaculis tribus, filo radicali circa Sabellarum tubos parasitice repente. 



EXPLANATION OP THE PLATE. 

 Tab. XX. 



Fig. a. The extremity of the tube of Sabella vesiculosa, occupied by a colony of Lar Sabellarum (mag- 

 nified 70 diam.). 



Fig. b. An individual Lar, displaying the hollow head-lobe and tentacles, and the sub-opake digestive 

 canal (magnified 120 diam.). 



Fig. c. A portion of one of the tentacles, showing the muricated surface. 



Fig. d. A single Lar, with the thread, attached to an excised portion of the tube, paralysed and some- 

 what contracted (magnified 240 diam.). 



Fig. e. A portion of one of the tentacles, flattened by pressure ; showing the parietal cells, and the edges 

 of septa (magnified 560 diam.). 



Fig./. Nucleated cells from a crushed tentacle. 



