EOLIS NORTHUMBRICA. 



irregular rings, and the bases set a little apart. Oral tentacles as long as the dorsal ones, 

 and like them abruptly truncated and white at the extremities. Branchice subclavate, and 

 of a cold bluish green with white tips ; the coloured vessel is granular, and does not entirely 

 fill the sheaths. They are set in nine transverse rows, far apart from each other, and 

 divided down the back : the three anterior rows are nearer together than the rest. The first 

 and second rows have three papillae each, the third five, and the two or three following four 

 each ; the rest gradually diminishing towards the tail. From the transparency of the skin a 

 green internal line is visible down the back, marking the direction of the central vessel 

 of the digestive system, from which branches are seen going off into the papillae ; there is 

 also a darkish lozenge-shaped spot immediately in front of the dorsal tentacles. Foot 

 extending a little way further than the termination of the branchiae behind ; the anterior 

 angles not much produced and somewhat rounded. 



A single specimen only of this species has been obtained, but as it lived several days 

 with us, we were enabled to complete a careful drawing and description. It approaches 

 very near to the Montagua viridis of Forbes, but differs in the character of the dorsal 

 tentacles and branchial papillae. In E. Nortlmmbrica the former are linear, and have the 

 upper portion annularly wrinkled or ringed, which gives them the appearance of swelling a 

 little towards the tip. In E. viridis these organs taper gradually, and are without rings or 

 wrinkles. The papillae of E. Northumbr'ica are of a much darker colour, less granular, con- 

 siderably larger, and are carried more erect, and in a radiating manner, whilst in E. viridis 

 they incline more backwards in the usual way, are nearly linear or slightly elliptical, and 

 taper at the points. The differences between this and E. amcena have been already pointed 

 out in our description of that species. 



