258 SPOLIA ZEYLANICA. 



As stated, the rule is that a ventral bundle is constituted by one 

 seta of each kind ; in segment VII., however, and again in XIV., 

 there were two such pairs on each side. In segment XII., on which 

 are situated the openings of the male ducts, there are no ventral 

 setse. 



With regard to the alimentary canal, the following features may 

 be briefly noted. The epithelium of the buccal cavity is flat, as is 

 also that of the floor of the pharynx ; the roof of the pharynx is 

 lined by columnar, richly ciliated cells. The pharjrnx passes into 

 the oesophagus without any sharp line of demarcation, and this 

 latter becomes the intestine in segment VIII. There is no stomach. 

 A number of large, deeply staining cells are attached to both sides 

 of septa 4/5, 5/6, 6/7, and there are a few also on 7/8. 



The cerebral ganglion is very intimately attached to the roof of the 

 pharynx. The ventral nerve cord is closely united with the ventral 

 body- wall, which in transverse sections shows a median ventral 

 groove externally, corresponding to the line of the nerve cord ; 

 there are three giant fibres dorsally in the cord, the middle one 

 being the largest. 



The testes are in segment XI. ; sperm morulse were found in 

 segments X. and XI., dorsal to the aHmentary canal, and not- 

 enclosed in sperm-sacs. The sperm funnels are situated on the 

 anterior face of septum 11/12 ; the vas deferens is seen ventral to the 

 intestine in XII. ; as is explained below, I did not follow it through- 

 out its course ; it appears however finally as a thin tube, 12-15 |jl in 

 diameter, running forwards from the level of septum 13/14 and 

 arching dorsally to join the proximal (upper) end of the atrium. 

 This latter is a conspicuous glandular-looking mass, vertically 

 elongated, situated in the anterior part of segment XIII. ; it narrows 

 towards its lower end and is prolonged obliquely forwards to the 

 male aperture on segment XII. 



The spermathecas are ovoid sacs, 80 X 70 [ji. and 120 X 95 [x res- 

 pectively, situated dorsally, one in segment XIV., the other in XVI. 

 The first, in XIV., was provided with a long narrow duct, 20 [x 

 in diameter, leading directly ventralwards. The second, in XVI. 

 (slightly the larger of the two), possessed a duct which, Avider at 

 first than in the previous case, narrowed gradually and led first 

 downwards, and then forwards ventral to the intestine in segment 

 XV. , to open externally behind the ventral setse of XIV. , in or near 

 the intersegmental furrow 14/15. 



I very much regret that owing to an unfortunate accident my 

 series of sections of this unique specimen was so damaged as to be of 

 little use in working out its anatomy. Fortunately the worm was of 

 small size, and consequently was transparent enough to allow of a 

 more or less complete account of its anatomy being written from 

 observations made while it was in cedar oil, before embedding. 

 The chief points of interest which have escaped me are the nephridia, 



