424 PROCEEDINGS OF THE ACADEMY OF [JunC, 



face of the prostomimn; the distance between them is li times their 

 diameter. 



Peristomial somite very distinct, its parapodia simple and extending 

 straight forward by the side of the prostomium, with which they come 

 in contact between the two pairs of eyes by means of their swollen 

 anterior ends ; elsewhere they are separated from the head, thus leav- 

 ing a pair of deep pits between. Tentacular cirri lost, but leaving deep 

 scars. Although the total width is nearly uniform, the iDody alone 

 tapers continuously from the peristomium caudad, being very slender 

 posteriorly; at VI it is 2^ times as wdde as the parapodia are long; at 

 XX they are about equal, and behind XXV the ■width of the body does 

 not exceed f the length of the parapodia. 



The parapodia following the peristomial exhibit a number of fea- 

 tures of interest. The next six are broad and very short, and so close 

 to the ventral surface of the body that the regular arched surface of the 

 dorsum is scarcely broken by them. The next (VIII) is decidedly longer, 

 and from this on to XXIV they continue to increase gradually in length 

 but very little in breadth. Beyond XXIV they are stout and thick, 

 and exceed in length the diameter of the body, with the dorsal and ven- 

 tral surfaces of w^hich they are continuous; their thickness in this 

 region is a result of their distension by sperm masses. The anterior 

 parapodia have the neuropodia broad and divided into pre- and post- 

 setal lobes, of wiiich the former is again divided into dorsal and ventral 

 processes; the notopodium is altogether wanting on the 1st, but on the 

 others is represented by a tubercle of increasing size, into which the 

 aciculum enters. On somites IX to XX the notopodium forms a rather 

 conspicuous broad flap, wliich passes dow^n the dorsal half of the an- 

 terior face of the parapodium, and from behind which the capillary setae 

 arise in connection with the integumental attachment of the fiber gland. 

 The dorsal angle of the neuropodimn is prominent, rounded and achae- 

 tous ; the ventral angle is enveloped by the lower end of the postsetal 

 fold. The notopodium becomes gradually reduced in size, and once 

 more shifts to a dorsal position and loses its setae ; by XXV it is a mere 

 dorsal papilla into wiiich the aciculiun enters and so remains to the 

 end. 



Only two elytra remain on the specimen, but at least 12 pairs of 

 functional elytrophores are present on II, JV, V and every alternate 

 somite to XXIII inclusive ; posterior to tliis small elevations occur on 

 every alternate foot, but it is doubtful if they bear elytra. The two 

 scales present are small, not nearly meeting in the middle line, delicate, 

 circular, low fmmel form, the margins wrinkled; they bear no papillae 



