300 ENTOZOA. 



intervention of a long neck. The segments are distinct from the 

 very commencement near the head, and so rapidly do they increase 

 in width that the anterior end of the body becomes lancet-shaped. 

 About fifty joints only are immature ; and, in the longest example, 

 (115 centimetres) Leuckart counted a total of 660 joints. It is, 

 however, a smaller species than B. latus, and is further distin- 

 guished by displaying a greater number of calcareous corpuscles, 

 and, more particularly also, in the " form of the uterine rosette, 

 which is not only smaller and longer, but likewise exhibits a 

 greater number of lateral processes." Leuckart thinks that the 

 T. vulgaris of Linneus and Pallas may be identical with this species. 

 To the naked eye (judging from the figures, and from the prepara- 

 tions which Leuckart has kindly contributed to my cabinet,) B. 

 cordatus, at first, reminds one of Groeze's thick-set Taenia jpectinata ; 

 but the structure of the latter is very different. Lastly, from 

 the history of the solitary case quoted by Leuckart, the Bothrio- 

 cephalus cordatus does not appear to give rise to very formidable 

 symptoms in the human subject. 



