28 Proceedings of the Royal Physical Society. 



with a dash of blue in it, while the tips are 

 bright cadmium - yellow, separated from 

 the green by a narrow pale yellow band. 

 Two specimens from the west side of 

 Holy Isle, 15 to 20 fathoms. 

 JEolis pelhccida (Aid. and Han.). 



In 10 fathoms between Port Lewis and 

 the Cordon. 

 jb\ molios* n. sp. (Plate I., Figs. 1-3). 



Body longish, tapering to a fine point pos- 

 teriorly, and of a yellowish green colour. 

 Oral tentacles of the same colour as body, 

 very short. 



Dorsal tentacles also yellowish green, short 

 and thick. 



Branchial processes stout but not large, 

 dark blue with large cadmium-yellow tips 

 encircled near the top by a narrow brown 

 band ; they are set in eight transverse 

 rows having five processes in each, the 

 three anterior rows are placed close to- 

 gether, the rest having greater intervals 

 between them. 



Badula formed of overlapping plates, each 



of which has a central spine and five lateral 



denticulations, which decrease in size from 



the centre to the edge (see Fig. 3). 



This spacies I am unable to identify 



with any previously described Eolis. 



Two specimens, about 1 cm. in length 



when expanded, were dredged from about 



10 fathoms, off Port Lewis. 



In my former paper I marked Eolis tricolor (Forb.) as 



doubtful. The same species occurred again this year several 



times, and it is certainly Eolis tricolor, though the colours 



are rather more vivid than those of the figures in the British 



Nudibranchiate Mollusca. Alder and Hancock say, that they 



have never seen this animal roll itself up like a hedge-hog 



* Named after St Molios, the hermit who inhabited the cave on Holy Isle. 



