266 PROCEEDINGS OF THE ACADEMY OF piay, 



spiues are about equidistant for the entire length, but increase in 

 height to near the tip where they again diminish. The bristles pre- 

 sent a very strongly serrated profile, especially at the point where 

 the tapering shaft has a diameter less than the height of the pro- 

 jecting spines. The dorsalmost and ventralmost setse are shorter 

 and bear nuich shorter capillary tips ; the former are also strongly 

 curved and the latter straight and very slender. 



Somite I has the parapodium supported by a single stout aciculum 

 which passes between the bases of the dorsal and ventral tentacular 

 cirri. It bears a tuft of four or five notopodial cirri of the extreme 

 dorsal pattern. II bears a nearly normal tuft of notopodial and a 

 small group of long-spined and slender neuropodial set re. 



A single elytron (the right one of somite VII) was found m situ 

 on the type specimen, and is represented on PI. XIV, fig. 20. It 

 is narrow and strongly reniform, Avith the external half broader than 

 the internal. Close to the anterior emargiuation, but rather to its 

 external side, is the area of attachment. Closely i)laced cilia 

 extend all around the posterior and external margin and increase 

 in size and frequency from within outward, while here and there 

 one or two of the larger cilia are replaced by much smaller ones. 

 Coarser cilia are scattered sparingly over the greater part of the 

 postero-exterual region, and, like the marginal ones, are longer 

 externally. 



With the exception of a very narrow antero-internal marginal 

 area the entire surface bears numerous horny papillse which, as 

 usual, increase in size slightly, but decrease in number toward 

 the posterior margin. In this case the papillse or spines are of 

 largest size and most numerous in a narrow area along the middle 

 of the scale. Along this area their summits are distinctly thick- 

 ened and bispinose. A line of tall, slender cylindrical ones with 

 prominent bifid tips runs from the point of attachment of the scale 

 to the outer margin, and a few similar ones are scattered elsewhere. 

 Just in front of the posterior margin is a row of seven prominent 

 conical papillre with broad bases and truncate roughened summits. 

 These are also covered with a horny cuticle, but appear to be softer 

 than the small spines and papillse, like which they are of a pale- 

 brown color. 



Three specimens. McCormick Bay, P. R. E. 



