184 SPOLIA ZEYLANICA. 



Oittotcenia. 



r^oth rhe genital organs and their dncisare dnjdicated in each 

 segment ; proglottids broader than long ; scolex unarmed ; uterus 

 transverse; eggs with pyciforni apparatus ; parasitic in rodents. 



49. — Cittotceaia huvfiaria. n.sp. 



PI. II., figs. 39 -40. 



Intestine of Lepufi nigricollis, Cuv. -. Nedunkeni. 



No complete examples were present in the collection, the 

 largest fragments measuring 55 mm. in length. The body is 

 broad, rounded in front ; no " neck "; anterior segments 02() long 

 X 5 broad, posterior 1'34 long x 7 broad. The scolex is not 

 protruding ; the four suckers measure 0*14 in diameter ; rostellum 

 absent. In the parenchvnie, two layers of longitudinal 

 muscles, transverse muscles and many dorsoventral muscles ; 

 on each side two longitudinal vessels, ventral larger, dorsal 

 smaller ; outside these, the nerve ; no calcareous bodies. In each 

 segment there are two groups of genital organs, each occupying 

 I of the cross-diameter and having their several ducts The cirri 

 protrude behind the middle of the margin of the proglottid ; they 

 measure 0"44 long x 0*035 broad at the base ; the cirrus-sacs are 

 short and club-shaped ; entad of them lies a fusiform hursa 

 ejaculatoria provided with longitudinal and circular muscles ; 

 entad of this a fusiform seminal vesicle and still further inwards 

 a convoluted vas deferens ; the very numerous spherical testes, 

 0-041 diameter, are distributed through the entire proglottids 

 without forming two lateral groups. The vagina is broad, with 

 high endothelium, expanding to a large receptaculum seminis ; il 

 runs ventrad of the cirrus-sac: entad of the receptaculum and 

 ventral in position lies the roundish ovary surrounding the 

 vitellariuu). 



The uterus traverses the proglottid from right to left and has 

 roundish protuberances in front and behind ; eggs round, 0-078, 

 with triple membrane ; the inner membrane forms the so-called 

 pyrif orm apparatus ; the spherical oncosphere measures 0*014. 



Iclithyotcenia. 



Scolex unarmed with four suckers, and often a fifth apical 

 sucker ; genital pores marginal, irregularly alternating, testes 

 numerous ; the vagina forms coils at the posterior margin of the 

 proglottids in the middle, which replace a 7'eceptaculum seminis : 

 parasitic in fishes and reptiles. 



