Fam. 3, Plate 31. 



Fig. 1. 

 EOLIS ARENICOLA, Forbes, M. S. 



E. alba : branchiis linearibus atro-viridibus, apicibus flavis, in seriebus 15 digestis : tentaculis 

 linearibus flavis : angulis anterioribus pedis subrotundatis. 



Hab. Dredged in ten-fathoms water, on weedy ground, at the entrance of Menai Straits. Prof. 

 E. Forbes. 



Body about three quarters of an inch in length, slender, white. Dorsal tentacles long, 

 linear, smooth, and tapering ; pale yellow, a little deeper towards the top. Eyes small, 

 situated behind them. Oral tentacles rather shorter than the dorsal pair, and of a similar 

 form and colour, placed on the upper part of the lip, which is semicircular, margined with 

 yellow. Bronchia rather long, linear, and tapering at the top ; the central vessel of a dark 

 bottle-green, irregular in its outline, much narrower than the sheaths, and extending about 

 two thirds up, above which the papillae are of a pale yellow, with the extremities colourless. 

 There are fifteen rows, of three or four papillae each, on each side ; the central ones are long, 

 and those at the sides very small and clavate, and more numerous ; the uppermost, when 

 there are four, are also small and irregular. Foot linear, squared in front, with the angles 

 slightly rounded off, and tapering to a fine point a little beyond the branchiae behind. 



This fine species was dredged off the Isle of Anglesea by Professor E. Forbes, in the 

 summer of 1844. Our drawing is taken from the sketches of that gentleman, kindly placed 

 in our hands for the purposes of this work. 



Fam. 3, Plate 31. 



Figs. 2 and 3. 

 EOLIS NORTHUMBRICA, Alder and Hancock. 



E. gracilis, sub-viride alba : branchiis subclavatis, viridibns, apicibus albis, in seriebus 9 remotis 

 digestis : tentaculis dorsalibus, subannulatis : lateribus anterioribus pedis pauhilum productis, rotundatis. 

 Eolis Northumbrica, Aid. and Hanc. in Ann. Nat. Hist. v. 13, p. 165. 

 Hab. On a coralline from the fishermen's lines, Cullercoats, A. H. 



Body a quarter of an inch long, slender, transparent, of a delicate pale green. Dorsal 

 tentacles rather long, cylindrical, abruptly truncated; the upper half white, with a few 



