DOTOXID/E. () ( .) 



Fam. DOTONHLE. 



Tongue narrow; teeth in a single central series. Tentacles 

 sheathed at the base, retractile. Gills superficial, fusiform, 

 on the sides of the back. 



The armature of the lingual membrane in this family dif- 

 fers from that of the other groups in having a single central 

 series of teeth, and the tentacles are retractile and fur- 

 nished with sheaths at their bases. There are two genera, 

 which inhabit the laminarian zone. 



Genus DOTO, Oken. 



Head covered by a simple veil. Tentacles linear, sheaths 

 trumpet-shaped. Gills clavate, compound, or rough with 

 whorls of tubercles, ranged in a single series on each side of 

 the back. 



Ex. D. coronata, Gmelin, pi. 65, fig. 5. 



The tentacular sheaths have simple margins, and the 

 ovate branchiae are rough with tubercles ; the front of the 

 head is simple, and the foot is linear ; they appear to feed 

 upon hydroid Zoophytes. 



Sjjecies of Do to. 



coronata, Gmel. maculata, Mont. 



fragilis, Forbes. pimiatifkla, Mont. 



VOL. II. 



