NO. 1 HARTMAN : POLYCHAETOUS ANNELIDS 71 



Prostomium pale, broadly oval, with 4 eyes on the anterior half, the 

 anterior pair at the frontal margin, concealed from the dorsum by the 

 broadly expanded antennal ctenidia, the posterior pair smaller, near the 

 dorsal antennal base (pi. 18, fig. 218). Elytra translucent, smooth save 

 for numerous minute punctations, distinguishable only under high mag- 

 nification. The first pair is subrectangular, w^ith fringe along the exposed 

 margin (pi. 18, fig. 219), the hilum excentric; others are excavate at 

 their anterior margins, the fringe limited to an outer, ectal portion, and 

 consisting of vi^idely spaced, simple filaments (pi. 18, fig. 224). 



Branchial cirri are present from the seventh segment, first as minute 

 papillae on the elytrophore, becoming gradually longer, and, from about 

 the eighteenth segment w^here best developed, they do not extend distally 

 to the notoacicular lobe. Parapodia have 3 w^idely separated ctenidia, 

 the middle one the largest. 



The first parapodium is uniacicular, has a long, tapering dorsal 

 cirrus that extends distally beyond the setae, a ventral cirrus less than 

 half as long, and a smaller, clavate cirrus (transposed prostomial an- 

 tenna) about two thirds as long as the ventral cirrus inserted antero- 

 dorsally to the dorsal cirrus. The proportions and parts are much as 

 those described in the species of Sthenelais (see above). Its setae are all 

 of one kind, numerous, long, capillary with fine serrations, the sub- 

 acicular only about half as long as the supraacicular. 



From the second, the parapodia are biacicular, each ramus termi- 

 nating in numerous digitate lobes (pi. 18, fig. 225). In the second 

 parapodium the notopodium is reduced in size, far surpassed by the 

 neuropodium. Its ventral cirrus is long, slender, extending distally be- 

 yond the neuropodium, and nearly as long as the dorsal cirrus of the 

 first segment. The neuropodial setae include (1) one or two superior 

 composite setae, with long spinose shaft, a tapering appendage about as 

 long as the spinose region of the shaft, and (2) numerous larger com- 

 posite setae with smooth or only slightly spinose shaft and long, taper- 

 ing, pointed appendage, with no trace of articles or canaliculae. 



From the fourth segment, the superiormost neuropodial setae are 

 simple, spinose (pi. 18, fig. 221) ; the median and inferior setae are all 

 composite and resemble one another except for greater thickness in the 

 median portion of the fascicle. The appendage is long, tapering to a 

 fine point, clear, without canaliculae (pi. 18, fig. 222). The shaft is 

 smooth or only slightly spinose (pi. 18, fig. 222). An inferiormost 

 fascicle of smaller, similar setae emerges ventral to the parapodial 



