EXTRACTS FROM FOREIGN PERIODICALS. 99 



respecting the birds, although the American specimen which he had seen 

 unquestionably constituted a distinct species. He concluded by calling the atten- 

 tion of the Society particularly to the subject, wishing that those who had 

 opportunities would endeavour to ascertain whether the bird corresponding to the 

 American L. leucopterus of Audubon ever occurred in Europe. 



EXTRACTS FROM THE FOREIGN PERIODICALS. 



ZOOLOGY. 



1. On the Anatomy of Pentastoma tcenioides. — Some entozoaries, observes 

 M. E. C. Miram, have already been studied under the double relations of Ana- 

 tomy and Zoology : such, especially, as the Trematodes ; but there is yet a great 

 number of intestinal Worms known only by their external characters. The 

 cause of this is, partly, their rarity, and also the difficulty of investigating them 

 anatomically ; this is particularly the case as regards Taenia, Botryocephalust 

 and other articulated reptiles.""' Yet certain of these intestinal Worms, which 

 do not present the same difficulties, as, for instance, Pentastoma tcenioides, have 

 not yet been the objects of accurate research ; hence I here endeavour to present 

 an anatomical and zoological account of this Worm, which I have often had 

 occasion to observe in Dogs. 



The external description of this animal is already sufficiently known, and I 

 can only repeat it ; but its anatomy has hitherto been performed in a manner so 

 little satisfactory (perhaps because it is very rarely found in other countries), 

 that a more intimate investigation of its organization has led me to considerations 

 both new and different from those heretofore generally advanced. It is thus that 

 we shall be enabled to recognize the intimate relations which connect this ani- 

 mal with Cistoides and Echinorhynchus, and to assign to Trematodes a more 

 elevated station in the zoological series. Cuvier described in a few words the 

 nervous system of this "Worm ; but those parts relating to its intestinal canal, 

 &c, appear to me inaccurate. 



Pentastoma tcenioides (Rudolphi) — or Tcenia lanceolata of Chabert — belongs, 

 according to Rudolphi, to the order Trematodes. 



The colour of the living animal is dirty yellow ; it is white after death, but 

 regains its natural hue when immersed in alcohol. 



* It is not clear in what sense M. Miram here employs the words M vers anneUs," and we there- 

 fore consider it most prudent to translate them as above, so as to include the four tribes character, 

 ized in the Regne Animal.— "Ed. 



VOL. III. — NO. XVII. T 



