(iOU 



same worm in Aylliya niaiila. 11 is also leijorlfd truni oUilt 

 wild birtis. Bellingham (1844, p. 320) gives Aythya cristata as 

 a host, Ijut does not state his authority. 



Hamann (18!>9, pp. 7-9, figs, a-c) found a cystlcerooid in Gam- 

 niarus pulex which he looks upon as the larvel stage of this 

 worm, and he assumes that as the domestic duck is the only 

 bird (1. e., so far as Hamann knows) which visits the water 

 in which this larval stage was found, this tapeworm Is also 

 found In domesticated ducks. An argument like this has 

 value in science only In order to place us on our guard for the 

 parasite, but it would be going altogether too far to accept 

 this worm as a parasite of domesticated ducks until it is 

 found in that host. Hamann made no infections with his lar- 

 val form, and accordingly the demonstration that this cystl- 

 cercold represents the larval stage of Di'. tenulrostris is still 

 lacking. Hamann describes the larva as lying in a cyst 

 fastened to the intestine of the crustacean, and possessing a 

 yellowish tail and grayish-white body; diameter 0.2'nm, hooks 

 10 in num'ber, 23 // long; calcareous bodies oval 6 //, oncospheric 

 honks 9 II. Von Llnstow (1892A, pp. 338-339) observed the same 

 larva in the same host, and Mrazek (1891, pp. 101-103, 126-129) 

 ilcscrlbes it from Cyclops agllls and Cycl. pulchellus In Bohe- 

 mia. His specimens were very small 0.10""" to 0.11mm; lo hooks 

 21 II to 23 li. tail long; oncospheric hooks 8 /t. 



IV Ct-nllol pores Irregularly alternate. 



18. UnBPANIDOTAENIA INFUNDIBULU'ORMIS (Qocze, 1782) Railllet. 

 1893. 



(1772. Globus stercoruus Scopoli— vkle Parona, 1S!)4; 1779, Taenia 

 Infundlbulum Bloch— vide Goeze, 1782; 1781, T. avium Pallas 

 —vide Goeze, 1782; 1782, T. articuUs convldeis Bloch— viide 

 Rud.. 1810; 1782, T. infundlbullformis Goeze; 1786, T. cuneata 

 Batsch [nee Llnstow, 1872]— vide Rud., 1810; 1788, T. conoidea 

 Schrank— vide Rud., 1810; 1794, T. serrata Rosa [nee Goeze, 

 1782q— vide Parona, 1894; 1800, Aiyselmlnthus infundibullformis 

 (Goeze) Zeder; 1803, Halysis infundibullformis (Goeze) Zeder. 



[PI. XIV, flgs. 173-186; PI. XV. ngs. 187-193.] 



Diagnosis: 20mm to 130mm, rarely 230mm long. Head globular, 

 lather depressed; rostellum elongate, cylindrical, or hemis- 

 pherical, swollen at summit, armed with a single row of 16- 

 20 hooks 20 fi lo 27 /* long, with long dorsal and short ventral 

 root; suckers rathe'r small. Neck very short. Anterior seg- 

 ments very short, the following funnel shaped, the anterior 



3n-n 



