TRITONIADA. 383 
Bornewua (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 
cylindrical, branched, gastric processes, to which small dendritic 
gills are attached ; foot very narrow. 
Supraminy PROC TONO TINE. 
Branchiz superficial, fusiform, on the sides of the back; ten- 
tacles simple, without sheaths ; tongue broad, teeth many ; jaws 
horny, strong. 
Procronotus, Alder and Hancock. 
Syn.—Venilia, A.and H. Zephyrina, Quatref. 
Distr—3 sp. North Atlantic. P. mucroniferus (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; papille on ridges down the sides of the back and 
round thé head in front; vent dorsal. 
Antiopa, Alder and Hancock. 
Syn.—Janus, Verany. 
3 sp. Britain, Mediterranean. A. spinole, Verany 

(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; papillze 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 (?). 
Mapre..a, Alder and Hancock, 1864. 
Example.— M. ferruginosa, A. and H. 
Differs 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. : 
SuspramMity DOTONINZ. 
Tentacles retractile into sheaths; branchiz superficial, fusi- 
form, on the sides of the back; tongue narrow, teeth in a single 
central series. 
? Doro, Oken. 
Etym.—Doto, a seanymph. 
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 
