r.sc. 



complk-ate iimlters; the torms whi^li must 1h> taki'ii into ooi>- 

 sideration uie Taoiila polymorpha Kudolphi, 1S19, pars (as de- 

 terminod by Kialvbe 1S69, p. 301) from Recuiviioslia avocella 

 and "Taenia lavls Bloch (Dieslng)"' (see Krabbe, 1S69, p. 302), 

 from AythJ^a. feiina (Fuligrula terina). 



In deference to my Italian colleague Dianiavo, I adopt bis 

 genera pi-oviaionally, postponing final opinion in regard to lliom 

 until his more detailed publieation appears. 



H Two !»ul>iiiOi11nn ovm-les In each seKuient. 



n'. Hooks on rttslollimi ftrrftngert In severnl rows. 



UenuK DieVLlUIUM K. Leuckart, tStU.l 

 (1S5S, Alyselniinthus Zeder. ISOO. partim Weinland.l 

 Diagnosis: Rostellum retractile, armed with several trans- 

 verse rows of alternatang hooks; hooks with small roots, the 

 base being discoidal; mature segments elongate with double 

 sets of genital organs; pores double and opposite; testicles very 

 numerous, scattered through the median field; ovary bilobleti; 

 vitellogene glands distal; uterus at first reticulate among the 

 testicles, finally resolving itself into independent egg sacs con- 

 taining one or several ova; ova with double transparent moni- 

 branos. Tyi>e si>ecies: D. caninum (Linne, 1767). 



\o mombers of this jjeiins have as j-et been loioiih'd 

 from binls. The type sihh-ios T>. eaniiium inhabits ihc 

 intestine of dogs, cats, niul man: its hirval staye lives 

 in (leas (Puk^x serraticeps V. iniians^i and lire (Ti-ieho- 

 d(H'tes canis). 



tieniis COrtltiNlA nianmro. 18!«. (Uen. Inq.). 

 niasnosis: Head large, with a rudimentary retractile rostel- 

 lum armed with a large numl>er of very minute booklets ar- 

 ran.ged in a single row. prong thick and short, without dorsal 

 root, with ventral root thin and elongate towanl the point. 

 Suckers large and unarmed. Mature segments broader than 



'For full bibliography consult D:amare's monograph (1S9,'!) II 

 Oenere Pipvlidium I.kt. < Atti. R. .\ccad. Soienze fische e 

 mat*>matlche. Vol. A'T. ser. 2a. No. 7. :!! pages. 3 plates. Care 

 should, however, be exercised in accepting the dates given by 

 Diamare as many typograiihical errors have crept into the 

 blbllogr.iphy. 



