12 



BK. W. NICOLL AND PKOF. E. A. MIXCUIN ON 



•017 mm., the handle being "01 mm. and the guard '007 mm. 

 long. The prong was of the same length as the guard. There 

 were four well-formed suckei^s, which had been pressed into a 

 somewhat crescentic shape (greatest diameter "042 mm.). 



Text-fiir. 2. 





V ■*./ 



CysticevcoiA oi H^menolepis mi(ri)ia. X 250. 



a. Rostellar spine in full lateral view. X 600. 



b. The same, somewhat tilted. 



Besides the two Cysticercoids described here and the Avell-known 

 Oysticercoid of Dipylidium caninum from the dog-flea and humaii 

 flea, there was only one other instance on record of a Oysticercoid 

 being found in a flea. This observation was made a few months 

 ago by Dampf (Oentralbl. f. Bakt. etc. Ite Abth. Orig. liv. 

 pp. 452-4), who found in a new species of flea Mesopsylla evxita from 

 the jerboa (Alactaga jaculus) a Oysticercoid bearing a close resem- 

 blance to the second of those described here. Dampf was obliged 

 to make his examination from a mounted (type) specimen of the 

 flea, and on that account could not be certain of some of the 

 details, as, for instance, the exact number of the spines and the 

 presence of a tail. So far as he could make out, there were from 



