TiENlA ELLIPTICA. 245 



minute and slightly peculiar in form. The full grown strobila 

 attains a length of 8 or 10 lines, and carries from 150 to 170 

 joints. The cysticercal condition is at present unknown ; but 

 Leuckart thinks it may be found in some kind of insect. 



15. T^NJA ELLIPTICA. 



T. elUptica, Batsch ; Rudolphi ; Creplin ; etc. 



T. canino; Pallas ; (also probably Linneus ; Eschricht ; etc.) 



T. caninafelis, Werner. 



T. cucumerina, Bloch ; Rudolphi ; Creplin ; etc. 



? T. cateniformis, Goeze ; Gmelin ; Rudolphi. 



T. cateniformis felis, Gmelin. 



T. cuniceps, Rudolphi. 



? T. osGulis marginalibus oppositis, Linneus. 



? Alyselminthus ellipticus, Zeder. 



A. cuniceps, Zeder. 



? Ralysis elliptica, Zeder. 



Dipylidium elliptica, Leuckart. 



This delicate cestode, when full grown, is usually about six or 

 eight inches in length, and is easily recognized by its double set of 

 reproductive organs, the outlets of which occur in the centre of 

 papillge placed opposite each other, or, in other words, one on 

 either side at the centre of the margin of every proglottis. The 

 head is furnished with a conical rostellum, armed with several rows 

 of minute hooks. 



From the statement long ago made by Eschricht, that he had 

 received a Tcenia canina, passed by a negro slave at St. Thomas, 

 Antilles, and more especially from the clear evidences recently 

 adduced by Leuckart ("Die mensch. Parasiten," s. 402), there 

 cannot be a shadow of doubt that either the Toinia elliptica of the 

 cat or the T. cucumerina of the dog may be reckoned amongst the 

 cestodes Hable to infest man. Those who, with Leuckart, regard 

 the cat's tapeworm as a distinct species from the Tcenia cucumerina 



