from the North Sea and adjacent parts. 175 



the lateral tentacles have move massive bases, and the filiform 

 tips of the cirri and tentacles are longer than shown in 

 M'Intosh's figure of the head of E. impar (1900, pi. xxvii. 

 fig. 13). The papilliB of the palps are so minute as to 

 require a careful search. No scales are present. 

 All the examples are of the typical British form. 



Evarne impar, Johnst., var. 



A nearly complete specimen of 25 segments and of IG mm. 

 length aTid 6 mm. breadth from tip to tip of the setae was 

 taken in 35 fath. off Tod Head. It is evidently a variety of 

 E. impar. It is a softer and smaller form, and shows on the 

 dorsum none of the characteristic brown markings. The 

 dorsum is pink in colour. The shape of the body is similar 

 to that of E. impar. All the scales have been lost. 



The head is slightly broader in proportion to its length 

 than that of E. imi^ar. There are no eyes. The lateral 

 eminences are broader in front, but the peaks are the same in 

 both forms. The median tentacle has the same massive 

 base, brown colour, and filiform tip, though there is no 

 apparent dilatation below the tip. In other points, as, for 

 example, the lateral tentacles, the palps, and their papilUe, 

 both forms agree. The tentacular cirri are absent. 



Compared with the breadth of the body, the length of the 

 bristles of the variety is less than that of the same structures 

 in Evarne impar^ while the dorsal bristles of the variety are 

 larger in comparison with the ventral than in the normal 

 specimens. 



In shape the dorsal bristles (PI. VI. fig. 2) resemble those of 

 Evarne lergueJensis, M'Intosh (1885, p. 97, pi. vi. a, fig. 12), 

 though they are less curved and less attenuated towards the 

 tip. The tip is longer and more pointed than that of E. im- 

 par, but the transverse rows of spines and the lateral spines 

 are similar. The tip is most like that of E. hergnelensis, 

 or, again, it may be said to be intermediate in shape between 

 that of ^. impar and that of E. atlantica, JMTiitosli. 



The superior ventral bristles resemble those of E. impar. 

 The median and inferior ventral bristles are more numerous 

 and show either no secondary process or only a small trace 

 of it, recalling thus the ventral bristle of E. atlantica. 



Many varieties of E. impar have been described. The 

 present one is probably akin to that mentioned by MTntosli 

 (1900, p. 357) as piocured by the 'Porcupine^ in 1870. 

 Specimens without eyes have likewise been obtained. 



