186 .SPOLIA ZEYLAXICA. 



51. — Aphanohothriu7n catenatum, n.sp. 



PI. II., fig.s. 43 and i6 ; PI. III., figs. 44, 45, and 47. 



Duodenum of the Flamingo, Phoenicopterus roseus, Pall.; Weli- 

 gatta. 



Length up to 135 mm.; breadth 9-10 mm.; body attenuated in 

 front, truncate behind and very thick ; the dorso ventral diameter 

 isto the cross-diameter as 9 : 20; anterior end rounded and retracted 

 in the middle and confined by arching cross lines ; scolex not 

 visible externally ; proglottids sharply delimited, at first 0*20, 

 then 0-27, behind 1-18 long. The middle § of the body width are, 

 dorsally and ventrally, occupied by five longitudinal rows of flat 

 dells which are also disposed in transverse rows ; posteriorly 

 these deepen into small grooves ; the cortical layer is to the 

 medullary substance dorsoventral as 2 : 5 ; in the tissue occur 

 oval calcareous bodies measuring on the average 0018 x 0'012. 

 Under the cuticle are circular and longitudinal muscles; a strong 

 transverse muscular layer divides the cortex from the medullary 

 substance ; in the cortex run radial bundles of longitudinal 

 muscles ; on each side two vessels run close together, dorsal a 

 smaller thick-walled vessel, ventral a larger thin-walled ; the 

 latter forms in each proglottid a strongly sinuous cross- 

 anastomosis ; the longitudinal nerve-trunk runs close outside the 

 vessels. 



The scolex is retractile ; in transverse sections 0*05 to 0*07 mm. 

 from the frontal point are found four suckers of 0*10 diameter, 

 and a fifth in the middle ; these are circular and open outwards 

 through a dorsoventral slit. The cirrus, 0-39 x 0*079 (0-12 broad 

 at the base), is regularly beset with hooks like therostellumof an 

 Echinorhynchus, arranged in transverse rings of sixteen each ; it 

 protrudes from a hemispherical protuberance ; the cirrus-sac 

 occupies ^ of the cross-diameter ; the numerous round testes of 

 026 diameter lie in the medullary substance approximated to the 

 transverse muscles. 



The vagina runs dorsad of the cirrus-sac ; both lie between the 

 vessels. The ovary consists of strands extending from the dorsal 

 to the ventral side and then bending inwards where they unite in 

 a short transverse branch ; dorsad of this lies the radiate shell- 

 gland, and dorsad of the latter the small vitellarium consisting of 

 nodular strands ; the ovarian cells are 0*013 large, those of the 

 vitellarium 0-0052 ; only the efferent duct of the uterus was 

 developed, perforating the transverse muscles ventral in the 

 middle line ; eggs not yet present. 



