160 THE ANNELIDA POLYCHAETA. 



body, which it also resembles in lacking the first cirri, and in its general structure. 

 But, whereas in euchaeta the second cirri are from two to four times as long as 

 the body, in the present species their length is from only a little more than one 

 to one and a half as long as the body. The brain is of a different form, the 

 eye-pigment black instead of reddish brown, and the parapodia of a clearly 

 different form, as pointed out above. 



The general appearance of this species also suggests T. idiura, sp. nov. From 

 this it differs in having the second cirri longer than the body instead of shorter, 

 the relatively shorter tail, of which the terminal part is naked and the parapodia 

 of its proximal portion fewer in number and of different form. The paucity of 

 material, however, makes it difficult to judge the value of some of the char- 

 acters and differences. 



TOMOPTERIS EURA, Sp. nOV.^ 



Plate 27, fig. 1, 2. 



Colorless and transparent, as usual. 



The body has an unusually long and slender caudal appendage, or tail, upon 

 which there are no traces whatsoever of parapodia, excepting a single aborted 

 pair at the cephalic end, which are unbranched and without fins. In front of 

 the tail the body bears nineteen pairs of fully developed parapodia, but with 

 the last few pairs progressively reduced in size. (Plate 27, fig. 1). 



Head with tentacles moderately long, acuminate, curving caudad at their 

 ends. First cirri present, slender, and much shorter than the tentacles. Second 

 tentacular cirri of the usual form, the part present in the larger specimen two 

 thirds as long as the body, exclusive of the tail. 



The brain is transversely elongate and narrow anteroposteriorly, being of 

 about the same thickness as the connectives, bowed caudad so that the anterior 

 face is concave. Eye-pigment black. Number of eye-lenses not accurately 

 determinable in the preserved specimens. 



The fin-membranes of the parapodia are broad and almost ch-cular, in some 

 irregularly, weakly, crenately lobed. Glands are present in the neuropodial 

 fins of the first and succeeding parapodia, the glandular area being large and 

 very conspicuous in most as a darker circular and thickened area. No glands 

 were detected in the notopodial fins. A rosette is present in each parapodium 

 of the first pair proximad of its bifurcation. No such rosettes detected in any 



' eu, good, :i]iil oiipa, tail. 



