HKOIINTHOLOGY HKLMINTHES CESTODES. 477 



Bothriocephahts vmblce. Hake (On Carcinoma of the He- 

 patic Ducts, London, 1839, 4to) Las taken the same objects 

 for peculiar elements of the pus in the hepatic abscesses of 

 the Rabbits. 



A considerable number of minute Entozoa discovered bv 







Valenciennes (Comptes rendus, 1844, p. 544; or Annales d. 

 Sc. Nat. t. ii, 1844, p. 248 ; or Froriep's n. Notiz, Nr. 727, 

 p. 5) in the abdominal cavity of Lacerta viridis, have been 

 raised by him to the rank of a separate genus, and desig- 

 nated as Dithyridium lacertes. The worms were three 

 millimetres long, had no joints, but only transverse rugse ; 

 on each side of the body were two undulating canals, 

 and at the cephalic extremity four suctorial acetabula. 

 The parenchyma of the body contained, especially anteriorly, 

 irregular angular granules, and the posterior extremity a 

 yellowish material of a cellular aspect, which would seem to 

 be the first beginning of the generative organs. Valen- 

 ciennes compared these animals with Scolex, and declared 

 them to be the parasite already mentioned by Rudolphi 

 under the name of Dithyridium. In every case, neverthe- 

 less, they were young Cestoidea, but which were perhaps 

 not sufficiently developed to allow their being assigned to 

 any particular genus. 



According to Owen it would appear (Lectures on Comp. 

 Anat. p. 48) that in Tsenia the intestinal canal commences at 

 a minute central orifice in the rostellum, and soon bifurcates, 

 which is positively incorrect, because the four vasiform 

 lateral canals of the Tsenise constitute, in their head, a closed 

 annular canal surouuding the sacculus of the rostellum. 



From Klencke (Ueber d. Cont. d. Eiugeweid, p. 147) we 

 again learn some most astonishing facts respecting the 

 Cestoidea. That the experimental injections he made 

 upon dogs with the ova of Bothriocephalus cotti and latus 

 succeeded excellently well, is of course understood, but 

 things also, which have hitherto been observed by no hel- 

 minthologists, arid cannot possibly ever be seen by them, 

 Klencke's gifted sight has enabled him to perceive at a 



