Annelida of the Bermudas. 661 



setae. There are three pairs of arborescent branchiae, but they are 

 situated on segments 2, 3, 6; segments 4 and 5 are without any trace 

 of branchiae in both specimens, though it is possible that they may 

 have been accidentally lost from those segments, and in that case 

 there would have been five pairs; the last pair is larger than the 

 others. The capillary setae begin on the 2d segment (or first 

 branchial) and continue on 22 segments. 



Eupolymnia (Polymniella) aurantiaca, sp. nov. 



Cirri long and slender. The first segment is medially emar- 

 ginate and recedes dorsally, but it advances in a broad lobe laterally ; 

 the next segment also has a similar lateral lobe. Ventral side with 

 10 short, transversely oblong glandular shields, with a few narrower 

 ones farther back. The branchial stems are usnally very short, as 

 contracted; the branches are fine and numerous. 



The uncini are much like those of typical Polymnia. The base is 

 about twice as long as broad, wide and rounded anteriorly, but 

 slightly convex, or even concave, on the basal edge. The rostrate 

 hook is large, strongly incurved; the two apical hooks, as seen in 

 profile, are unequal, small and closely appressed; in a top-view there 

 is a central, rather small denticle, and five much smaller ones, stand- 

 ing nearly in one cross-row farther back. The capillary setae are 

 long, smooth, slender, scarcely limbate, mostly with delicate, thin, 

 flat, flexuous tips. 



Color, in life, orange red; the gills blood-red. Length of the 

 largest specimen, which is mutilated beyond the 30th segment, in 

 formalin, 50°^°^. Castle Harbor, in dead corals. Only two 

 specimens. 



Streblosoma M. Sars, 1871. 



Grymoaa Malmgren, Ofver. Kong. Vet. Akad. Forh., 1865, p. 888 (noii Fres. , 



Protozoa, 1858). 

 Streblosoma M.. Sars, Viclensk.-Selsk. Forh., 1871, j). 10. Type, S. cochJeatum 



Sars. 



The name Grymma was preoccupied, and Streblosoma is, appar- 

 ently, the only tenable name of this genus. 



It is closely related to Thelepus, but has three pairs of clustered 

 cirriform branchiae, and the capillary setae begin on the second seg- 

 ment (1st branchial). All, or nearly all, the segments bear setic. 



The only New England species is S. spiralis Ver., 1874, as 

 Grymcea. 



