EVARNE ATLANTICA. 363 



Posteriorly the dorsal eminence disappears, and the bristles become more slender, 

 but still retain their characteristic structure. The tips of the slender ventral series are 

 extremely elongate, but traces of the bifid condition are still to be found in many. The 

 foot is thus practically formed of the ventral lobe. 



In young examples the bristles, especially the ventral, are proportionally longer, 

 and at this stage — 5 to 6 mm. — two were pelagic at the surface. 



In the development of these bristles the tip is practically complete on issuing from 

 the foot, and additions are made posteriorly as it pushes out. 



The dorsal cirri have the form of the tentacular cirri, and their filiform tips extend 

 beyond the bristles. The ventral cirri are slightly brownish (madder), elongate, 

 subulate organs, the slender tips of which extend beyond the fleshy part of the foot. 

 They are perfectly smooth. 



The delicacy of the body, the structure of the feet and bristles, as well as the 

 rudder-like caudal style, show that this species has peculiar habits, probably more or 

 less pelagic. What relation it may hold to other forms is unknown, and epigamy, or the 

 epitocous condition, may yet be clearly demonstrated in the family. 



4. EVARNE ATLANTICA, Mcintosh, 1897. 



Specific Characters. — Head like that of JEJvarne impar, but the cilia on the tentacles 

 and the papillge on the palpi seem to be smaller. The cirri generally are more slender. 

 Dorsal bristles longer and less curved than in E. impar, and their rows of spines closer. 

 Ventral bristles have longer tips than in E. impar. 



Synonym. 

 1897. Evame atlantica, Mcintosh. Ann. Nat. Hist., ser. 6, xx ; p. 168. 



Habitat. — Dredged at Rockall (Station 3a) by the Royal Irish Academy's Expe- 

 dition, June 15th, 1896. 



A fragment of about fifteen segments of the anterior end. 



The head resembles that of U. impar, Johnst., in general outline, but differs in 

 having somewhat smaller eyes. The tentacles and palpi also are similar, though the 

 cilia on the former and the minute papilla3 on the latter are less bold. The cirri 

 generally are a little more slender. 



The body is thicker and more massive than in U. impar of the same size, and both 

 dorsally and ventrally in the preparation has a pinkish skin-colour. The arrangement of 

 the bristles at the side of the body is more trim. No segmental papilla is observable, 

 though the eminence is distinct. In this respect it agrees with & impar of the same 

 size, in which the papilla only becomes noticeable about the twelfth bristled foot. In 

 large examples it is evident on the seventh bristled foot. 



Feet. — The first foot (bearing the tentacular cirri) has a few short bristles conforming 

 to the dorsal type, though with somewhat closer rows of spines. In the second foot the 

 dorsal bristles are longer and less curved than in R impar, and while there may be room 

 for doubt concerning the proportionate distances of the spinous rows, there can be none 



