244 



ENTOZOA. 



The existence of this worm as a distinct species is also due to 

 the shrewd investigations of Dr. Weinland, made during his visit 

 to America. Unfortunately, no perfect specimen has been seQn ; 

 but, from portions of at least six examples of the strobUa, Dr. 

 Weinland has clearly established its claim to be recognized as a 

 good species. The proglottides are short; and "there is a 

 yellowish spot, clearly visible to the naked eye, situated about the 

 middle of each joint, which reminds us very much of the colour 

 and situation of the genital organs, as known in Bothriocephalus." 

 The reproductive orifices occur all along one side of the worm ; 

 and the eggs are unusually large. Only one instance of the 

 occurrence of this species is yet recorded ; and on this occasion 

 they were obtained by Dr. Ezra Palmer, in considerable numbers, 

 from an infant nineteen months old. They were expelled without 

 medicine, their presence not having been even suspected.* 



14. TiENIA NANA. 



T. nana, Siebold and Bilharz ; Kiichenmeister ; Leuckart ; etc. 



T, cegyptiaca, Bilharz. 



Diplacanthus nanus, Weinland. 



Kuchenmeister, in his enthusiasm, was led to indulge the hope 

 that this minute tapeworm would turn out to be his imaginary 

 Tcenia echinococcus altricijpariens ; and I find that Yan Beneden has 

 fallen into the error of describing the Tcenia echinococcus of Siebold 

 under the title of T. nana. This is unfortunate. Weinland, on 

 the other hand, has suggested the formation of a new genus for 

 the reception of this worm ; but the so-called " bifid" character of 

 the hooks (as described by Bilharz) is a misnomer, the " doubled " 

 appearance being simply due to the close approximation of the 

 claw and the anterior root-process (Leuckart). The hooks are 

 essentially the same as those of other Tcenice, only they are very 



* See D. F. Weinland's "Essay on the Tapeworms of Man,'' p. 49; also his 

 " Beschreibung zweier neuer Tsenioiden aus dem Menschen," 1861, p. 8, tab. iv. 



