34 FIONID^E. 



pellucid white, with 2 red lines along the back : head small : 

 tentacles rather short, longitudinally folded, truncated, rising 

 into a point behind : branchial processes elliptic-oblong, pointed, 

 slightly tuberculated, with a ramified rosecoloured gland in the 

 centre of each, giving them a leaf-like appearance ; they are 

 arranged in numerous transverse rows of two or three abreast 

 on each side of the back. L. 0-9. 



HABITAT : Among small seaweeds within tide-marks or in 

 shallow water ; rare. Devonshire coast (Montagu) ; Belfast 

 Bay (Getty and Hyndman); Black Hock, Leith (Landsborough). 

 [Shetland (J. G. J.).] 



This elegant little Nudibranch has been very seldom met 

 with on our coast ; but the localities in which it occurs show 

 it to be pretty widely dispersed. Its range extends to Sweden. 



2. H. DENDRI'TICA, Alder and Hancock. 



Calliopaa dendritica, A. & H. in Ann. N. H. Istser. xii. p. 233. H. den- 

 dritica, Brit. Nud. Moll. fam. 3, pi. 40. 



BODY ovate, rather bulging out in the centre, and tapering 

 to a fine point behind ; greenish-white, with dendritic green 

 or olive veinings : tentacles oblong ear- shaped, with a rounded 

 apex, their margin forming a continuous outline with the 

 sides of the head : branchial processes elliptic-linear, with an 

 internal ramified greenish gland, and spotted with white ex- 

 ternally ; they are set in 8 transverse rows of 3 or 4 each on 

 the sides of the back. L. 0-35. 



HABITAT : On green seaweeds, especially Codium tomentosum, 

 in rock-pools or in shallow water ; gregarious. Torbay (Mrs. 

 Wyatt); Whitley, Northumberland, rare (Miss Dickinson). 

 [W. Sweden (Loven).] 



Family II. FIO NIRdS, Alder and Hancock. 



Mantle rudimentary : branchial processes linear or papillose : 

 tentacles 4, simple : vent latero-dorsal : mouth with large cor- 

 neous jaws : hepatic system with two longitudinal vessels. 



This family differs from the Eolididce in the presence of a 



