218 PROCEEDINGS OF THE ACADEMY OF [April, 



above the base and tapers to a slender end. From behind its base a 

 low ridge runs to the posterior margin of the prostomium. In both 

 specimens the proboscis is retracted and the large mouth is bounded 

 by a rather prominent lip, formed by the union of the peristomium 

 with the succeeding somite. 



The peristomium and two succeeding segments are much crowded 

 forward so that the tentacular cirri arise beneath the head. The first 

 or peristomial cirrus is a ventral cirrus and arises from the forwardly 

 directed portion of the peristomium beneath the eye. It resembles 

 the median cephalic tentacle in form and size, but is a trifle longer and 

 arises from a distinct basal article. Arising from beneath the pos- 

 terior dorsal margin of the prostomium, apparently from the peristo- 

 mium, are three somewhat flattened appendages on each side, the outer- 

 most of which is the longest and connected with the corresponding 

 tentacular cirrus by a slight web. The middle one is nearly as long, 

 and the inner one is minute (fig. 1). 



Somite II bears two pairs of tentacular cirri, a dorsal and a ventral 

 one, separated by a considerable interval in which arises a small 

 papilla probably representing a parapodium. The ventral cirrus 

 occupies a position below the peristomial cirrus, which it resembles, 

 but which it exceeds decidedly in both length and thickness. The 

 dorsal cirrus of this somite arises at a higher level than any others in 

 the body from beneath the postero-lateral angle of the prostomium, 

 and its rather stout but long and tapering style reaches to IX or X. 

 Somite III bears a dorsal tentacular cirrus only, which, with the com- 

 plete parapodium to which it belongs, is depressed to a position more 

 ventral than usual, in marked contrast to the dorsal cirrus of II. It 

 arises from beneath and slightly behind the latter, which it resembles 

 in form and size (fig. 1). 



As stated before, the first three somites are carried well forward, 

 the peristomium and II being coalesced ventrally but distinct, though 

 very short, above. Remaining somites are well differentiated and 

 obscurely biannular, the anterior and decidedly larger annulus bearing 

 the parapodia. There are about 78 somites, the posterior end of the 

 body being in a state of regeneration and the somites of that region as 

 a consequence very small and tapered to a minvite pygidium. 



The body, excluding the parapodia, is slender, about two-fifths of 

 the total width, and of nearly uniform diameter, except near the taper- 

 ing ends. It is somewhat arched dorsally ; flattened and with a shallow 

 neural groove below. 



Parapodia (fig. 2) are prominent and well developed throughout. 



