RUNCINA. 15 



Genus EUNCI'NA*, Forbes. PL I. f. 3. 



This genus being the only one known^ it is unneces- 

 sary to repeat the description of the family. 



RuNciNA HANcocKif^ Forbcs. 



Felta or Limapontia'i sp., Alder & Hancock in Ann.& Mag. N. H. xviii. 

 p. 289, pi. iv. f. 1-3. E. Hancocki, F. & H. iii. p. 612, pi. CCC. f. 2. 



Body smooth, more or less clothed with microscopic vibra- 

 tile cilia : mantle a little indented in front, nearly straight at 

 the sides, and slightly rounded behind : colour black, sprinkled 

 with minute points of brown, except at the front and rear, 

 which are buff and fawncoloured : eyes rather large, each 

 surrounded by a pale ring ; behind the eyes is a curved line 

 of small white specks : foot yellowish, tinged with brown or 

 black, and marked with a few flake-white spots ; it is rounded 

 in front, the sides are almost parallel and broader than the 

 mantle, towards which they are usually folded up ; tail or 

 extremity of the foot extended one-fourth of the length of 

 the body behind the vent : gUl-plumes 3, small, slightly pin- 

 nate, near the vent, and generally projecting a little beyond 

 the mantle : vent beneath the posterior margin of the mantle 

 (Alder and Hancock). L. 0-2. B. O'l. 



Habitat : On Confervse,, in pools near high-water 

 mark^ at Torquay (Alder and Hancock) ; Belmont Bay 

 near Weymouth (Thompson and Gray). Mr. W, 

 Thompson informs me that it is very abundant in rock- 

 pools at low-water of spring tides^ among Confervas 

 (Ceramium strictum, C. rubrum, and C. Deslongchampii) y 

 apparently feeding on the Diatoms which swarm on 

 these delicate seaw^eeds. Clyde district^ in rock-pools, 

 with Limapontia nigra (Norman) . 



* A rural goddess. 



t Commemorative of Mr. Albany Hancock, whose labours on the 

 Nudibranchs, in conjunction with Mr. Alder, are especially famous. 



