

NO. 1105. PROCEEDINGS OF THE NATIONAL MUSEUM. 185 



Marigues 1 in 1778 mentions and figures tapeworms found in the 

 body cavity of rabbits; but it is impossible to determine what species 

 he had before him. 



Pallas in 1781 found no tapeworms in the many hares he examined. 

 He received some worms taken by Graf von Bork from hares and 

 described them as Tcenia acutissima. The worm is evidently a double- 

 pored leporine form, and on that account probably a CUtotccnia; but 

 from the description given by Pallas it is impossible to definitely decide 

 which of the three leporine double-pored forms he had before him. 

 On this account I do not consider myself justified in reinstating the 

 specific name acutissima. 



Pallas evidently thought that Drepanidotcenia lanceolata of geese 

 was identical with the leporine form, and he also placed Schistocephalus 

 from the body cavity of Gasterosteus side by side with the parasite of 

 hares, although his text clearly shows that he thought further investi- 

 gation might result in separating Schistocephalus as a distinct species. 



Goeze in 1782 states that Tcenia pectinata is found in hares and wild 

 rabbits, but he never found it in tame rabbits; he mentions its simi- 

 larity to a parasite (Drepanidotcenia lanceolata} of geese, to one (Schis- 

 tocephalus solidus) of the Stickle-back (Gasterosteus) and to the broad 

 tapeworm (Moniezia expansa) of sheep, but does not consider it specific- 

 ally identical with any of these forms. Goeze found the species nearly 

 always present in 1-year old hares and in wild rabbits, often 20 to 30 

 in an individual host. "The margins of each segment were rather 

 bluntly rounded, and on this rounding, by means of the hand lens a 

 very small opening was visible, out of which eggs could be pressed, 

 and out of which, when the live worms were placed in hot water, 

 through the sudden contraction of the canals, they 'were pressed in 

 small threads." The first part of this quotation, " the margins, etc." 

 (" Die Seitenrande jedes Gliedes kulpichtrund, und auf dieser Ruen- 

 dung") is the only portion of Goeze's article which can be interpreted 

 as referring to double pores. His figures do not show pores, but Figure 

 7 makes the impression upon a worker of l)eing a double-pored cestode. 

 The head is described as very small; segmentation begins almost 

 immediately back of the head; the segments increase in size very rap- 

 idly; four suckers on head, but no hooks; of thirteen specimens the 

 longest measured about 6 inches; it possessed 204 segments. 



Zeder in 1800 placed Goeze's specific name in the genus Alyselmin- 

 thus, and gave a discussion of the parasite which he supposed was 

 identical with Goeze's form. He states, however, that he found only a 

 single pore to each segment. While it seems possible that Zeder's 

 form is identical with Andrya rhopalocephala, as assumed by several 

 authors, the point can not be definitely settled, as Zeder's description 



1 Observations sur des vers Tonia trouves dans le ventre de quelques lapins sau- 

 vages ; Observations sur la physique, etc. (Rozier), XII, Paris, pp. 229-231, pi. n, ng. 3. 



