TRlTONlADiE. 383 



BoRNKLLA (Gray), A. Adams. 



Distr. — 3 sp. Straits of Sunda, on floating weed ; Borneo. 

 A. digitata^ Ads. (xci, 22). 



Animal elongated ; dorsal tentacles retractile into branched 

 sheaths ; head with stellate processes ; back with two rows of 

 C3dindrical, branched, gastric processes, to which small dendritic 

 gills are attached ; foot very narrow. 



Subfamily PROGTONOTINJE. 



Branchiae superficial, fusiform, on the sides of the back; ten- 

 tacles simple, without sheaths ; tongue broad, teeth many ; jaws 

 hornj^, strong. 



Proctonotus, Alder and Hancock. 



Syn. — Yenilia, A. and H. Zephjanna, Quatref. 



Distr. — 3 sp. North Atlantic. P. mucronifei'us (xci, 23). 



Animal oblong, depressed, pointed behind ; dorsal tentacles 

 2, linear, simple, with eyes at their base, behind ; oral tentacles 

 short ; head covered by a small semilunar veil ; mouth with 

 horny jaws ; papillae on ridges down the sides of the back and 

 round the head in front ; vent dorsal. 



Anteopa, Alder and Hancock. 



Syn. — Janus, Yerany. 



Distr. — 3 sp. Britain, Mediterranean. A. spinolse, Yerany 

 (xci, 24). 



Animal ovate-oblong, pointed behind ; dorsal tentacles lamel- 

 lated, united at the base by an arched crest ; head with a small 

 veil and two labial tentacles ; papillae ovate, placed along the 

 lateral ridges of the back and continuous above the head ; vent 

 central, posterior, sexual orifice at the right side ; lingual teeth 

 numerous (?). 



Madrella, Alder and Hancock, 1864. 



Example. — M.ferruginosa, A. and H. 



Diff'ers from the other members of the family in the lateral 

 position of the anus, and the absence of oral tentacles, unless the 

 oral veil be considered such. 



Subfamily i> rOiV/A^^. 



Tentacles retractile into sheaths ; branchiae superficial, fusi- 

 form, on the sides of the back ; tongue narrow, teeth in a single 

 central series. 



* ? DoTO, Oken. 



Etym. — Doto, a sea-nymph. 



Distr. — 4 sp. Norway and Britain, on corallines in deep 

 water to 50 fathoms. D. coronata^ Gmel. (xci, 25, 26). 



Animal slender, elongated ; tentacles linear, retractile into 



