232 PROCEEDINGS OF THE ACADEMY OF [Vol. LXXV 



station consists of a pygidium, three non-setigerous and two 

 setigerous segments and is more slender and attenuated. 



Head as a whole much contracted, about as long as deep, the 

 cephalic plate inclined at nearly a right angle with the body axis. 

 Cephalic disk one-third longer than wide, oval. Limbus well 

 developed, with a pair of small but distinct postero-lateral notches, 

 anterior to which the lateral lobes are well developed, widely 

 flaring and with smooth entire margins,, the posterior lobe abruptly 

 lower, stiff, erect and with the margin faintly crenulated or ob- 

 scurely toothed and a distinct median notch. Palpode small, 

 thick, bluntly rounded and continuous behind with the narrow, 

 prominent median carina which reaches caudally to the level of 

 the postero-lateral notches. Nuchal organs deep, narrow, perfectly 

 straight slits bounding carina for entire length. Laterad of each 

 is a slightly elevated line and crossing the cephalic disk caudad of 

 the carina are two small concentric ridges. Integument of entire 

 post-oral portion of peristomium deeply and closely reticulated. 



First three setigerous segments (II-VI) each about one-fifth longer 

 than the head, cylindrical, the first shghtly larger anteriorly. Each 

 bears a presetal anterior one-fourth smooth glandular zone, the re- 

 mainder being reticulated like the peristomium but with the fur- 

 rows predominantly transverse. The next three segments are simi- 

 lar in form and size but the glandular zones occupy the anterior 

 two -fifths and the postsetal reticulations are much reduced. These 

 six somites are remarkably uniform in size, VIII is more slender 

 and elongated, IX and X are coalesced and together about one- 

 half longer than VII. None of these segments bear collars or pre- 

 sent other noteworthy characters. 



Somites II, III and IV bear small linear tufts of setse and ventrally 

 one or two spines situated one-fourth of the length from the cephalic 

 border; VI, VII and VIII have the spines replaced by from twelve 

 to twenty crochets in a sessile vertical row in a slightly more caudal 

 position; VIII, IX and X bear raised biscuit-shaped tori with a 

 larger number (about 30 on X) of crochets. 



At the caudal end, the fifth and fourth propygidial segments are 

 each seven or eight times as long as thick; the next succeeding 

 non setigerous segment is about half as long, enlarged caudally 

 to a clavate form; the next again is further reduced in length about 

 one-half and bears a slight annular thickening at the caudal end. 

 The last is very much shorter and consists principally of a promi- 

 nent raised ring out of which the caudal funnel arises. This bears 

 no setse and no definite parapodia; the two preceding segments, 

 though achsetous, bear prominent lappet-like parapodia, while 

 the two setigerous segments have typical parapodia with small 

 erect tufts of dorsal setse and small tori with crochets. 



The pygidium consists of a well-defined funnel with flaring 

 borders spreading to the width of the preceding segment and bearing 



