HELMTNTHES : COLOMBO MUSEUM. 185 



50. — Ichthyotcenia cry23tobothrium, n.sp. 



PL III., figs. 41-42. 



Intestine of Chryso2)dea ornata, Russell, a tree-snake ; Kuru- 

 negala. 



Length 130 mm. ; head end rounded, scolex retracted, the four 

 suckers being found only in transverse sections surrounded by a 

 parenchyme-ring with eight vessels ; the suckers extend 0*40 mm. 

 backwards ; their lumen communicates outwardly by two lacunae, 

 a dorsal and a ventral, which ceases in the midst of the suckers ; 

 a median plug projects freely. 



The anterior proglottids are very short, 0*02 long x I'OO broad ; 

 the middle are 0*59 long x 1"69 broad ; the posterior 2"48 long 

 X 0'87 broad, much longer than broad ; the last proglottid is 

 rounded behind. 



Calcareous bodies sparsely distributed ; two layers of longitu- 

 dinal muscle-bundles parallel with the cuticle traverse the 

 parenchyme, outer tliinner numerous bundles, inner thicker and 

 sparser ; at the margin on each side run two vessels, ventral 

 stronger, dorsal thin and liighly sinuous ; outside these the stout 

 nerve. 



The genital pores are marginal ;aid irregularly alternating in 

 the anterior third of the margin of the proglottid. The cirrus is 

 small, rod-shaped and plain ; the cirrus-sac occupies | of the cross- 

 diameter ; the genital sinus is retracted ; the vas deferens forms 

 abundant coils reaching to the middle of the cross-diameter ; the 

 numerous testes lie in a transverse row in the dorsal half of the 

 medullary substance and measure 0'052 to 0065. The vagina 

 runs ventral straight inwards; ventrad of the ovary it forms 

 numerous coils as equivalent of a receptaculum seminis. 



The ovary consists of very large cells and occupies scarcely | of 

 the cross-diameter ; dorsal lies the roundish vitellarium ventral 

 to which the shell-gland is applied and ventral to this a haust- 

 urium (Scliluckapparat). The spherical eggs have a double 

 membranous shell, measuring 0047 to 0*052. 



ApkcDiuhothr iiDic, n.gen. 

 Body broad and thick like a Scliistocephalus larva, with short 

 posteriorly acute -angled proglottids; in the frontal region a 

 dorsoventral slit leading to five suckers ; destitute of scolex and 

 hooks ; genital organs simple, ducts double, marginal ; the uterus 

 discharges ventral in the middle line ; cortical layer broad ; 

 cirrus closely beset with hooks ; on each side two vessels, the 

 larger with transverse anastomosis ; ovary resolved into coils 

 which lie dorsoventral and transverse; belongs to the Anoplo- 

 cephalinse. 



