28o Records of the Indian Museum. [Vol. IX.. 



pass from the mature stage into an atrophying stage. Testicles 

 numerous, situated in two more or less separated lateral fields in 

 the medullary layer; vas deferens always highly developed, usually 

 forming a coil. Ovary distinctly or indistinctly bipartite, situated 

 in distal portion of segment, usually median in forms with single 

 series of genitalia; in forms with double series, sub-median; in 

 forms with lateral pores, on side of median line toward the pore. 

 " Schluckorgan " always present. Vitelline glands with nu- 

 merous foUicles, situated in two more or less separated lateral 

 fields nearly always dorsal and ventral and usually in cortical 

 layers. Eggs quite similar to those of Fasciola, but not always 

 with operculum. 



Family BOTHRIOCEPHAUDAE, Cobbold, 1864. 



:= DlBOTHRIOCEPHALINAE, Ltihe, 1899. 



With the characters of the order. 



Sub-family (I) LIGULINAE, Mont. & Crety, 1891. 



General characters : — Scolex armed, short and three-cornered. 

 Suckers small and feeble. Neck absent. External segmentation 

 present or absent. Genitalia simple. Genital pores situated ven- 

 trally, posteriorly, or close together, approximately median. 

 Testes dorsal. Ovary median and ventral. Shell gland median 

 and dorsal. Vitelline glands lateral. Vas deferens dorsal, strongly 

 coiled, and lying in front of the opening of the cirrus pouch, 

 which latter is continuous with the vesicula seminalis which is 

 always present. Eggs covered. Adults in water-birds. Larvae 

 in coelom of Teleosts. 



Genus Ligula, Bloch, 1782. 



General characters: — Adult form only, segmented anteriorly. 

 These segments, however, do not coincide with the inner segmenta- 

 tion of the genitalia. Suckers feebly developed. Larvae with- 

 out suckers and unsegmented. Larvae in coelom of Cyprinoids. 

 Adults in water-birds. 



Ligula simplicissima, Rudolphi, 1802. 

 Several specimens : — 



Z E V ^^-%f--^. No history. 



ZEV^-y'^. Labeo roliifa. Berhampur, Bengal. T. Southwell. 

 ZEV ^-?f^. Labeo rohita. Calcutta. ? 



ZEV i-'y-^'i. Nemachilus rupicola. Kurseong, E. Himalayas. F. H. 

 Gravely. 



Another specimen has lately been obtained by the writer from 

 Rashora daniconius from Sambalpur, Behar, June, 1913. 



