216 NEW EUPHROSYNE-SPECIES. 



fourth of the total breadth. The caruncle is three-lobed ; it 

 consists of a broad, elevated keel, extending till the anterior 

 half of segment V, and of two lateral bands, reaching the 

 posterior margin of the fourth segment. The eyes are small ; 

 the stout, unpaired tentacle, inserted between them, has a 

 long, slender terminal joint, stretching as far as the end 

 of the lateral bands. Each parapodium carries ten cirri- 

 form branchiae ; the eight lateral ones stay crowded next to 

 each other, whereas the two median ones are separated by 

 a rather great distance. Both dorsal cirri are somewhat 

 longer than the branchiae; the lateral one of them is situated 

 between the second and third gill. The dorsal fascicle contains 

 two kinds of forked bristles; some of them, placed in a 

 single series directly in front of the branchiae, are nearly 

 as long as these and have the shaft covered with small, 

 triangular spines. However the greater part of them are 

 much stouter, thrice as long as the branchiae and have their 

 tips impregnated with calcium carbonate. The ringent bristles 

 are of the type of E. foliosa. 



The neuropodium carries a tuft of bifid bristles of dif- 

 ferent length ; however the longest of them measure only 

 one third of the length of the stout dorsal ones. 



Euphrosyne sibogae, n. sp. 



At Station 40, near the Paternoster-islands, with the 

 townet several specimens of a small Euphrosyne were col- 

 lected ; the largest of them measure 10 mm. in length and 

 3 mm. in breadth (the bristles not included). The bare 

 medio-dorsal field is rather narrow, in some specimens hardly 

 visible. The number of its segments amounts to 26. The 

 caruncle is oblong and narrow, its breadth measuring about 

 one fourth of its length ; it extends over five segments and 

 reaches the anterior part of the sixth one. In front of the 

 large dorsal eyes, situated in the anterior half of the ca- 

 runcle, a cylindrical cirrus, with a short conical joint, is 

 inserted, stretching not far beyond them. The eyes on the 



Notes from the Leyden IVEuseum, Vol. X^XIII. 



