POLYCHAETE WORMS, PART 1 63 



Genus Euphrosine (Savigny, MS.) Lamark, 1818 



Type (designated bj^Hartinaii, 1959a) : Euphrosine myrlosa (Savigny, 

 MS.) Lamark, 1818. 



All 3 species have the dorsal part of the prostomiiim with a ridgelike 

 caruncle extending to segment 5 and consisting of 3 longitudinal 

 parallel lobes, the middorsal one nearlj^ covering the lateral ones; 

 with a median antenna shorter than the caruncle, consisting of a 

 thickened oval basal portion and a slender process about as long as 

 the basal part (terminal filament may get knocked off), with a pair 

 of ejeQ lateral to the base of the antenna (fig. 146). Ventral part of 

 prostomium with a pair of eyes closely approximated, a pair of very 

 small antennae lateral to the eyes, with palps reduced to rounded 

 cushions anterior and lateral to the ventral mouth (fig. 14a). Par- 

 apodia biramous, with rami slightly distinct. Setae transparent 

 white to tan. 



Key to the New England Species of Euphrosine 



1. Notosetae of a single kind — all very unequally bifurcated, smooth, long, 



giving the dorsum a characteristic spiny aspect. Branchiae consisting of a 

 single curled filament close to the upper dorsal cirrus (fig. 14^). 



E. cirrala (p. 63) 



Notosetae of 2 kinds: (1) Very unequally bifurcated, smooth; (2) unequally 



bifurcated, with branches longer, serrated on inner sides of branches (fig. 



14e). Branchiae more numerous, branched, in a row posterior to the 



notosetae (fig. 14c?) 2 



2. Branchiae usually with 2-4 branches (1-12), without terminal clusters of 



branchlets (fig. Hd). Bifurcated serrated notosetae with longer branch 

 curved toward shorter branch (fig. 14e). Notosetae much longer than 

 branchiae, longest about same length as neurosetae, giving a shaggy 



appearance to dorsum E. borealis (p. 65) 



Branchiae with numerous branches, with terminal clusters of conical branch- 

 lets. Bifurcated serrated notosetae with branches diverging (fig. 1-1/). 

 Notosetae only slightly longer than branchiae, shorter than neurosetae, 

 giving a neat, trim appearance to dorsum . . . . E. armadillo (p. 65) 



Euphrosine cirriita Sars, 1862 

 Figure 14gr 



Euphrosyne cirrata Fauvel, 1936a, p. 14. — Monro, 1939, p. 94. — Wesenberg-Lund, 

 19.5()a, p. 11, pi. 2, figs. 8, 9; 1953, p. 29. 



Description. — Length up to 10 nun., width including setae up to 

 5 mm., segments about 20. Notopodium with a single curled filiform 

 branchia close to the upper dorsal cirrus. About one-third of mid- 

 dorsum uncovered, without notosetae. Notosetae all very unequally 

 bifurcated, long, slender, longer than neurosetae, arranged in 3 rows 

 of longer to shorter spines, giving a characteristic spiny aspect. 



