234 PROCEEDINGS OF THE ACADEMY OF [Vol. LXXV 



broadly rounded, the width one-third and the length about one- 

 fifth of width of disk (on another specimen it is somewhat narrower). 

 Carina forming a prominent, arched profile; anteriorly, beginning 

 at the palpode, it is nearly vertical and at right angles to the body 

 axis, but bends caudally in a broad curve until it becomes parallel 

 with the body axis and then continues as a perfectly straight 

 ridge, higher than wide,, and disappears in the pit beneath the 

 collar lobe. Mouth prominent, trifid, consisting of a transverse 

 crescentic slit from which a longitudinal groove of equal length 

 runs forward. Peristomium completely merged in head, slightly 

 biannulate ventrally, the more cephalic annulus smaller. 



Somites II to IV strongly biannulate, the anterior rings being 

 in each case completely glandular and about one-half as long as 

 the posterior setigerous ring; III and IV are each about as long as 

 the head, II being somewhat shorter; V and VI are longer, VI being 

 nearly twice as long as II; both are biannulate but the furrows 

 are obscure and the gland cells have completely disappeared from 

 the dorsum but remain well developed ventrally and laterally. 



Remaining somites obscurely differentiated, the furrows having 

 disappeared. Measured by the distances between the tori, they 

 increase in length rapidly to XI which is eleven times the length 

 of II, the difference being due perhaps in part to the fact that the 

 middle region of the })ody was encased in a tube and thereby 

 protected from the contracting action of the preserving fluid. 

 After XI, the segments gradually decrease in length to XX which 

 is slightly longer than II. VII retains a small ventral crescent of 

 gland cells representing the anterior annulus and a rather })road 

 ventral band connecting the tori. On VIII the latter band only, 

 much reduced in width, remains. Other middle segments lack 

 glands altogether, except for a few small areas about the tori; 

 caudal segments bear only slight traces of glands. There are no 

 true collars on any of the anterior segments, but VII bears an anter- 

 ior dorsal flange that slightly overlaps VI. Probably there are two 

 short, achsetous, preanal segments, but they are indistinctly de- 

 veloped, the first in contraction forming a slight transverse 

 dorsal fold or low collar. The rectum is prolapsed as a finely 

 rugous tube about 2 mm. long. 



Except for the palpode, nuchal organs and carina (and there 

 is even a faint imitation of the latter), the pygidium is a nearly 

 perfect duplicate in funnel and platform of the cephalic plate, but 

 of course reversed in dorso- ventral aspect. The setigerous tubercles 

 and tori have quite the usual size and arrangement and present 

 no noteworthy features. 



On II, III and IV, there are rather numerous setae in prominent 

 fascicles. They are colorless and slender, with the limbus confined to 

 the basal part below the very long, slender, smooth capillary 

 end. Posteriorly the fascicles become smaller and the anterior 



