610 EOLIDID^. 



attenuated behind, depressed and sliglitly expanded at the 

 sides, greenish, with dendriform green hneations. Tentacles 

 large, their anterior margins continuous with the sides 

 of the head. Branchia) long, cylindrical, with lobulated 

 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. BIFIDA, Montagu. 



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

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



Hermcea bifida, Loven, Ind. Moll. Scand. p. 7. — Alder and Hancock, ilonog 

 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. Branchiae 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. Branchiae 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 



