994 MR. F. E. BEDDARD ON 



ordinary domestic varieties ; and in all the many foals born 

 in the Gardens between our Somaliland Ass and domestic asses of 

 English and Spanish breeds, the ear-patch, shoulder and spinal 

 stripes Avere present as in the dams. 



The above stated facts suggest that, with the possible exception 

 of the eai--patch in horses, the shoulder and spinal stripes as well 

 as the stripes on the legs have been lost comparatively recently 

 by the species that are without them. 



PAPERS. 



45. ( 'Ontributioiis to the Anatomy and Systematic Arrange- 

 ment of the Cestoidea. By Frank E. Beddard, M.A., 

 ■ F.R.S., F.Z.S., Prosector to the Society. 



[Received May 23, 1911 : Read June 27, 1911.] 



(Text-figures 204-215.) 



II. On two New Genera of Oestodes from Mammals. 



The following communication to the Society contains an 

 account of the anatomy of two species of Tapeworms, contained 

 in the collection of Cestoidea belonging to the Society. I 

 feel it necessary to refer them to new genera, and the facts which 

 I shall presently bring forward will I hope justify my so doing. 

 The first of these species is certainly near to Thysanosoma, and is, 

 as I think, clearly to be referred to the same genus as a species 

 recently described by me * and temporarily referred to the genus 

 Thysanosoma. I pointed out, however, in that paper a number 

 of difi"erences from other tapeworms referred to the genus 

 Thysanosoma, and intimated that it probably would be necessary 

 to institute a new genus for the worm. This expression of 

 opinion is justified by the discovery of a second species which 

 is clearly of the same genus. The second species considered in 

 the present paper was placed by me temporarily, and in a report to 

 the Prosector-ial Committee, in the genus Bertiella. It shows, 

 however, some affinities to Tcenia {sensu stricto) and seems on 

 account of various peculiarities, which in dvie course will be 

 pointed out, to demand the creation of a separate genus. 



I shall commence with an anatomical description of the new 

 species allied to Thysanosoma; this I place in a new genus which 

 I propose to call Thysanotcenia. 



Thysanotsenia lemuris, gen. et sp. n. 



An example of a Black-headed Lemur {Lemui^ macaco), which 

 had lived in the Gardens three yeai^s and three months, contained 



* See No. I. of this series, P. Z. S. 1911, p. 651. 



