HBLMINTHES : COLOMBO MUSEUM. 183 



Lams ; O. Lacazei, Villot (187o), from Limusa ; and O. insignis, 

 Loiinberg (1880), from Rcemaioj)V^> and Mergus. 



Friis and Villot describe at the apex of the scolex tive distinct 

 suckers in a row armed with hooks, whereas Lonnberg speaks of 

 undulating loops ; in O.proteux and O. insignis the genital pores 

 alternate irregularly ; the similarity in the formation of the 

 scolex seemed to require that the species here described should 

 be placed in the genus Ophi^yocotyle. 



Brnchocephalus, n.gen. 

 Scolex with long rostellum with six backwardly directed loops 

 of hooks ; genital pores marginal, regularly alternating ; cirri 

 large, strongly and closely spinulose ; no receptaculum seminis ; 

 three testes in each segment ; segments (proglottids) broader than 

 long ; eggs two-shelled, the inner shell narrowed at the poles, 



•48. — B rochocephalus paradoxus. n.s^J. 

 PI. IL, figs. 36 and 38; PI. III., figa. 35 and 37. 



Duodenum of the Lesser Sand Plover, yEgialitis mongulica, 

 Pall. ; Weligatta. 



Length 85 mm. ; without '• neck ; " anterior proglottids 062 

 broad x 00088 long, posterior 0-75 broad x 0*18 long, always 

 much shorter than wide ; scolex with four suckers and long 

 protruded knobbed rostellum, 0-10 long x 0"062 broad in front • 

 at the apex six backwardly directed tracts of thirteen iiooks each 

 i.e., seventy-eight hooks in all ; the hooks are slender with very 

 small hook and lever, measuring 0'029. 



Two layers of longitudinal muscle-bundles are seen in cross- 

 section under the cuticle ; on each side two vessels, the larger 

 forming a posterior anastomosis in each segment ; the nerve runs 

 near the margin. Genital pores marginal and almost regular] v 

 alternating, rarely two follow on the same side ; no calcareous de- 

 posits. Cirri very large, broad and spinulose, as long as half the 

 cross-diameter of the proglottid ; the large muscular cirrus-sac 

 is expanded outwardly and occupies about ^ of the cross-diameter ; 

 three small ovate testes in the middle line, one in front, the 

 others symmetrical behind it ; behind the testes a transverse 

 vitellarium occupying ^ of the cross-diameter ; the ovary sur- 

 rounds the testes in the middle third ; vagina and cirrus-sac 

 lie between the two vessels ; the eggs are elliptical and two- 

 shelled ; outer membrane 0-081 x 0-047, oncosphere spherical ; 

 the inner thick shell is narrowed at the poles. 



The genus GgrocoeUa shows a zig/ag line, interrupted at eight 

 points, with forty hooks on the rostellum : four testes in each 

 segment, and the spherical eggs have two appendices. 



