156 G. A. and W. G. MacCallum, 



They meet almost at a point in a thickwalled tube in the midst 

 of the Shell gland from which Starts the narrow uterus. No recep- 

 taculum seminis nor Lauker's Canal could be found. At first the 

 eggs in the uterus take a bluish stain and this continues for some 

 distance finally giving place to the more mature ones with thick 

 yellow Shell. It may be remarked that in this worin the large mass 

 of radiating cells which forms the shell gland oecupies the whole 

 width of one loop of the worm and is very conspicuous. It is 

 traversed also by one Strand of the mid portion of the uterus and 

 by a canal which seems to belong to the excretory System. It is 

 curious that the portion of the body just behiudthisthrough which the 

 beginning of the uterus courses from the shell gland contains in 

 addition only the straight Strand of the uterus and one of the 

 vitellarium. It leaves the general mass of loops and after a little 

 returns again and enters into their midst. 



In the more anterior part of the body there are masses of 

 testicular substance but theier outline is very indefinite and diffi- 

 cult to trace. No vas deferens can be found and although there are 

 certain loops whose content seems to be chiefly testicular tissue, 

 which project from the inner surface of the mass it is impossible 

 to reconstruct these organs clearly. Since little slender masses con- 

 taining this tissue alone project sometimes from the edge of the 

 section one gains the Impression that they may be part of another 

 worm with essentially male characters but no attempts to trace these 

 were successful in anything more than losing them in the general 

 mass — nor was a second head discoverable. 



On the whole, then, in this mass was found a taugled coiled 

 worm with liighly developed female organs of reproduction opening 

 near the mouth and ill defined testicular structures without recognis- 

 able connections. No second worm could be definitely made out. 



In the second series the general appearance is at first sight the 

 same. Abundant coils are seen to contain wide uterine canals filled 

 with eggs and Strands of the ovary and vitellarium but even the 

 most careful search falls to reveal the mass of the shell gland which 

 is so conspicuous a feature of the contents of the other mass. On 

 the other band the testicle is extremely well developed and sharply 

 outlined and the vas deferens with its connection becomes very con- 

 spicuous. 



Beginning in the mass of coils most distal from the broad 

 attachment of the cyst is a distinct head closely resembling that 



