202 PROCEEDINGS OF THE ACADEMY OF [May, 



only the anterior 8 segments and the tapered caudal end being distinctly 

 narrower; margins of body even and regular, the parapodia being 

 small and inconspicuous and arising from small, slightly depressed 

 rings; segments more or less distinctly divided into dorsal, ventral and 

 lateral fields by longitudinal furrows above and below the parapodia, 

 the latter forming interpodal wrinkled glandular areas, and the ventral 

 field divided by a median neural groove, which becomes obscure 

 posteriorly. Anterior region, consisting of peristomium and nine 

 podous segments, separated from the posterior region b}^ a deep 

 annular groove in which the ninth pair of parapodia lie (fig. 24) ; its 

 segments somewhat narrower than those of the posterior region and 

 without distinct intersegmental furrows, the distance between succes- 

 sive parapodia about f the width. Ventral median field occupied by a 

 series of slightly overlapping, segmental ventral plates, which become 

 smaller from in front caudad and are divided into halves by the neural 

 groove; lateral fields distinctly bounded and much furrowed trans- 

 versel3\ Distinct glandular bands or half-rings extend across the 

 dorsum between the parapodia, and several small and irregular trans- 

 verse furrows mark the dorsum and sides of each segment, dividing it 

 imperfectly into about 3 incomplete rings. Posterior region slightly 

 wider than the anterior and consisting of 84 or 85 segments; first 

 segment very short, but the others increasing in length until they are 

 about half as long as wide; ventral field distinctly wider than dorsal, 

 without ventral plates and divided by a deep ventral groove. Through- 

 out most of this region the parapodia lie in the deeper furrows, and a 

 shallower furrow is only obscurely indicated a short distance caudad 

 to each pair. Farther back it becomes clear that the segments are 

 biannulate and that the parapodia lie between the larger anterior and 

 smaller posterior annulus. 



Pygidium very small, oljlique, with the anus dorsal and covered by 

 a broad flat papilla; below and behind the anus a pair of small, slender 

 cirri, often replaced by a pair of minute papillae. 



Parapodia all biramous and more or less foliaceous, the first 9 pairs 

 with capillary setse only, the others with, crochets only in both rami. 

 The first 8 pairs consist of winglike, foliaceous, postsetal lamince, the 

 notopodial being somewhat broader and strongly curved ventrad to 

 meet the neuropodial, which is longer and projects more directly laterad ; 

 both somewhat contracted at the base to form a stem, which bears the 

 spreading, fan-shaped tufts of setse, the neuropodial being somewhat 

 the larger. The ninth parapodium (fig. 26) is similar but rather larger 

 and has a more extensive series of setse. In the posterior region the 



