162 TAPEWORMS OF HARES AND RABBITS STILES. VOL.XIX. 



a remarkable tendency to unilaterality can not, unassociated with other 

 characters, be looked upon as establishing the genera as distinct. 



In the preliminary note to this revision, I described two American 

 parasites as provisional members of the genus Andrya, reserving opin- 

 ion as to the validity of the genus and calling attention to some 

 important differences in the American and German leporine single- 

 pored forms. Since the publication of my note, 1 I have received a copy 

 of a recent paper by Meyuer describing two new species of cestodes, 

 probably allied to the two forms of Bertia described by Blanchard, and 

 through the kindness of Geheimrath Leuckart I have obtained one of 

 the cotypes of Meyner's Tcenia (Bertia) mucronata. It will be necessary 

 to consider these forms briefly in connection with the leporine parasites. 



Meyner evidently accepts Bertia only as a subgenus of Tcenia; as 

 Bertia has, however, absolutely no generic relations with Tcenia, I now 

 change his specific combinations from Tcenia (Bertia) mucronata and 

 T. (B.) conferta to Bertia mucronata and B. conferta. 



Meyner discusses the anatomy of these two forms in detail, and from 

 his account the following descriptions may be taken as specific 

 diagnoses : 



BERTIA MUCRONATA (Meyner, 1895), Stiles, 1896. 

 (Plate IX, figs. 4-5.) 



1895, Tcenia (Bertia) mucronata, MEYNER, Zeitschr. f. Naturw., LXVIII, (5 ser., 

 VI), pp. 1-86, pi. i, figs. 1-7. 



Diagnosis. Bertia mucronata (Meyner, 1895), Stiles, 1896: Strobila 

 dagger-shaped, attains 140 mm. or more long by 8 to 10 mm. broad, 

 serrate, imbricate, whitish yellow. Head, 0.34 to 0.714 mm. broad, 

 apex nearly square, rostellum wanting; suckers oval 0.255 mm. broad, 

 0.2 mm. deep. Neck short, not sharply separated from head. Genital 

 pores irregularly alternate. Male organs: Testicles appear in one 

 hundred and twentieth segment, numerous, 75 to 100 p in 'diameter, 

 crowded together in [antero Jdorsal portion of median field. Yas defer- 

 ens dorso-anterior of vagina; cirrus-pouch not mentioned. Female 

 organs: Glands in pore side of median field; vagina long; receptacu- 

 lum seminis globular; uterus single, transverse, at first a simple tube 

 appearing in about one hundred and thirtieth segment; eggs enter it 

 in three hundred and fiftieth segment and blind pouches are formed. 

 Ova 30 //, with three membranes; pyriform body 15 to 16 yu broad; 

 oncosphere 13 to 14.4 //. Three longitudinal nerves each side of seg- 

 ment, of which middle nerve is the largest. Dorsal canal dorsal of 

 ventral canal. Genital canals pass dorsally of longitudinal canals and 

 longitudinal ventral and main nerves, but ventrally of dorsal nerve. 

 Calcareous bodies 4.9 to 18.4 //, more numerous in cortical layer; about 

 150 visible in transverse section of scolex, 10 to 12 visible 10 mm. from 

 anterior extremity, 400 to 500 in transverse section of distal segments. 



'Notes on Parasites 38 : Preliminary note to " A Revision of the Adult Leporine 

 Cestodes," Vet. Mag., 1895, II, p. 341-346. 



