609 



same worm in Aythya marila. It is also reported from otlier 

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

 a host, but does not state his authority. 



Hamann (1889, pp. 7-9, figs, a-c) found a cysticercoid in Gam- 

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

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

 bird (i. 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 oi'der to place us on our guard fcu" 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 cysti- 

 cercoid represents the larval stage of Dr. tenuirostris 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 0.2mm, hooks 

 10 in numbei', 2S fi long; calcareous bodies oval 6 fi, oncospheric 

 hooks 9 fi. Von Linstow (1892A, pp. 338-339) observed the same 

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

 rlescribes it from Cyclops agilis and Cycl. pulchellus in Bohe- 

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

 21 fi to 23 II. tail long; oncospheric hooks 8 fi. 



Iv Gentlal pores Irregularly alternate. 



18. UREPANIDOTAENIA INFUNDIBULIFORMIS (Goeze. 1782) RailUet. 



1893. 



(1771'. Globus stercoreus Seopoli — vide Parona, 1S94; 1779, Taenia 

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

 —vide Goeze, 1782; 1782, T. articulis convideis Bloch— vide 

 Rud.. 1810; 1782, T. infundibuliformis Goeze; 17S6, T. cuneata 

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

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

 1782]— vide Parona, 1894; 1800, Alyselminthus infundibuliformis 

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



[PI. XIV, figs. 173-186; PI. XV, figs. 187-193.1 



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

 rather depressed; rostellum elongate, cylindrical, or hemis- 

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

 EO hooks 20 ft to 27 fi long, with long dorsal and short ventral 

 foot; suckers rath&r small. Neck very short. Anterior seg- 

 ments very short, the following funnel shaped, the anterior 



