83H Proceedings of the Royal Irish Academy. 



C. Peachii is very sluggish in its habits, and has a remark- 

 able power of adhesion to the substratum on which it is rest- 

 ing, a quality shared by Calma glaucoides, a species of similar 

 form and habits. 



I have followed Alder and Hancock in placing this species in 

 the genus Cuthona, since, in shape and radula, it appears closely 

 related to C. nana. With respect to the otocysts and jaws I 

 have no information. ^ In Bergh's " System " it appears pro- 

 visionally under the head of Cratena, on what grounds I do not 

 know. 



Distrilution : — Fowey, Cornwall ; CuUercoats, ITorthumher- 

 land (A. & H.). Falmouth Harbour; English Channel off 

 Plymouth (W. I. B.) 



Genus — Cavolina. 

 Cavolina aurantiaca, A. & H. 



Polls ( Cavolina) aurantiaca, A. & H. 

 Cutliona {?) aurantiaca, Bergh. 



In great abundance on the colonies of Tubularia larynx, 

 which had grown on two hulks moored in Valencia Harbour 

 for about a year. This species, like some others occurring on 

 the hulks, was found by us nowhere else, though we di'edged 

 on several occasions in the immediate vicinity. 



The numerous specimens examined agreed in every way vsdth 

 Alder and Hancock's description and figures, except that in 

 very many cases the papillae were not tipped with orange. 



I have met with specimens having white-tipped papillae at 

 Plymouth and in the Isle of jSIan. Among a batch of indi- 

 viduals found on Tid)ularia and Coryne in the last-named 

 locality, some had the tips of the papillae opaque white, others 

 deep yellow, while the rest formed a graduated connecting 

 series. I have only seen one example as liighly coloured as 

 Alder and Hancock's drawing. This was dredged in Millbay 

 Channel, Plymouth Sound, and in the same haul were colonies 

 of the orange-coloured hydroid Garveia nutans as well as 

 Tahularia indivisa. The radulae of the last-named individual 



' My intention to examine these and other internal characters was frustrated by 

 the accidental carrying away of the Plymouth specimens in the laboratory circula- 

 tion. 



