Dr. H. Krabbe on the Cestoid Woi^ms of the Bustard. 47 



pearance of any outer lobe or expansion of the animal cover- 

 ing the outside of the shell, as in Amphij^eplea glutinosa. The 

 mantle in Limncea involuta is not developed to any greater 

 extent than in other allied species, such as L. peregra and L. 

 auricularia ; and the external surface of the shell remains at 

 all times uncovered, whether the animal is exj)anded or 

 not. 



Description. — Body olive-brown shading in the centre into 

 slaty grey, and mottled with darker colour inside the shell. 

 Tentacles broadly triangular. Eyes nearly sessile. Foot 

 broad, oblong, rounded and slightly emarginate in front, nar- 

 rowed behind into a shortish tail. 



Mr. W. H. Baily, of the Greological Survey of Ireland, has 

 kindly made a drawing from the living animal, which has 

 never previously been figured ; and from our figure (magnified 

 2 diams.) it will be seen that the animal closely resembles 

 that of Limncea as drawn in plate iv. of the first volume of 

 Gwyn Jeffreys's ' British Conch ology,' except that the body of 

 Limncea involuta is rather narrower, and the tentacles broader 

 at the base. 



Glasneviu, May 25, 1869. 



VI. — On the Cestoid Worms of the Bustard. 

 By Dr. H. Keabbe*. 



[Plate in. figs. 4-13.] 



A TAPEWORM which, from its peculiar appearance, long since 

 attracted attention, and has been easy of recognition, is the 

 Tcenia villosa occurring in Otis tarda. It was described and 

 figured by Blochf, who gave it the above name on account of 

 the fringed appearance of one of its margins, which is due to 

 the fact that the posterior angle of one side of each joint is 

 drawn out into a narrow process. In five bustards which he 

 examined there were at least 500 in each, and in a young bird 

 which had been reared in captivity he estimated the number 

 of worms at about 1000. Bloch states the length to be 4 feet ; 

 and the number of joints should be, according to his calcula- 

 tion, at least 32,000, which, however, is probably about ten 

 times the actual number. 



At the same time it was treated of under the name of Tcenia 



* Translated from the * Videnskabelige Meddelelser fra Naturhistorisk 

 Forening i Kjobenhavn, for Aaret 1867,' pp. 122-126, by W. S. Dallas, 

 F.L.S. 



t Abhandl. von der Erzeugung der Eingeweidewlirmer (Berlin, 1782), 

 p. 12, tab. 2. figs. 5-9. 



