610 EOLIDIDiE. 



attenuated behind, depressed and slightly expanded at the 

 sides, greenish, with dendriform green liueations. Tentacles 

 large, their anterior margins continuous with the sides 

 of the head. Branchise long, cylindrical, with lohulated 

 green centres and white-spotted surfaces, set in eight 

 transverse rows of three or four in each. 



Gregarious on Codium tomentosum in the uppermost part 

 of the laminarian zone, at Torbay (Mrs. Wyatt). 



2. H. niFiDA, Montagu. 



Doris bifida, Montagu, Lin. Trans, vol. xii. p. 198, pi. 14, fig. .3. 

 Tritonia bifida, Fleming, Brit. An. p. 284. 



HermcBa bifida, Loven, Ind. Moll. Scand. p. 7. — Alder and Hancock, Monog 

 pt. v., fam. 3, pi. 39. 



Body (nearly an inch long) linear, subcylindrical, 

 yellowish, with two red lines at the base of the branchiae. 

 Tentacles rather short, their margins terminating at the 

 sides of the head. Branchioe ovato-lanceolate, transparent, 

 reddish, with a crimson ramifying central vessel, numerous, 

 unequal, and ranged in indistinct series. 



Littoral and laminarian zones. Devon (Montagu) ; 

 Belfast Bay (Getty and Hyndman) ; Leith (D. Lands- 

 borough, jun.); Sweden (Lov^n). 



ALDERIA, Allman. 



Body ovate-oblong, sub-convex, not provided with a 

 distinct mantle. Head produced into a lobe on each side. 

 No tentacula. No jaws. Branchire papillose, arranged 

 in transverse rows on the sides of the back. Vent 

 central on the hinder portion of the back. Genital orifice 

 at right side. 



This curious genus might form the nucleus of a distinct 



