48 Mr. H. A. Baylis on a neio 



network wliicli not only extends througliout tlie ventral part 

 of the medullary parencliyme, but also penetrates on to the 

 dorsal side. The dorsal longitudiual vessels are not in direct 

 communication, like the ventral vessels, with this system, 

 but, if connected with it at all, are only indirectly so connected 

 (v. Janicki, 1910, p. 394). In Inemmcapsifer hyracis 

 (which is removed by Dr. Beddard to ZschohheeJla) there is, 

 according to v. Janicki's account (1910, p. 378), an indirect 

 connection of this kind between the dorsal vessels and the 

 capillary network, and also a very slender vessel running 

 parallel with and external to each main dorsal vessel, and 

 connected with it at frequent intervals by little cross-vessels 

 like the rungs o£ a ladder (1910, pL xiii. fig. 16). 



Von Janicki's figures of the excretory network in tliis species 

 do not give the impression of a series of almost regular longi- 

 tudinal vessels, connected by a single transverse vessel for 

 each segment, as observed in the species which forms the 

 subject of this paper. On the contrary, the vessels composing 

 tlie network in Z. hyracis seem to be much more numerous 

 and irregular. 



In my species there is no distinct pair of ventral longitu- 

 dinal vessels of large diameter. Tlie capillary network, 

 which appears to take their place, extends into the middle of 

 the medullary parencliyme, but the dorsal vessels are situated 

 at the extreme dorsal limit of the latter, and are, I believe, 

 entirely distinct from the network. I have not observed any 

 appearance resembling the ladder-like structure described for 

 Z. hyracis, nor even any lateral offshoots whatever from the 

 dorsal vessels. 



Taking into consideration all the above-mentioned morpho- 

 logical points, I have decided to place the present species in 

 the genus Zschokkeella. It may be defined as follows : — 



Zschohkeella muricola, sp. n. 



Length 9-12 cm. Breadth 3'5 mm. Kumher of segments 

 230. Scolex wider than 7ieck. Segments cdl broader than 

 long. The excretory system consists of a distinct pair of dorsal 

 longitudinal vessels and a ventrcd network arranged on a 

 regular jjlan, with a transverse vessel in each segment. Genital 

 organs begin to appear in the neck before the segments become 

 clearly defined. Genital j^ores unilatercd, on the left side, near 

 the anterior end of the proglottids ; not situated on a promi- 

 nent papilla. 1^0 genital cloaca. Testes in tioo unequal 

 groups, the larger group on the side remote from the genital 



