42 



mil. broad, are usually rather smaller, lighter brown 

 in color, smoother, more oval, and less globular than 

 are those of the Tsenia solium. The egg-capsules 

 show only two consecutive layers, and are more easily 

 broken than are those of T. solium (Kiichenmeister). 



4. Tcenia nana. This entozoon was discovered 

 (and but once seen) in 1851, in Cairo, Egypt, by Dr. 

 Bilharz, in large quantity, in the small intestine of 

 a young man, who died of meningitis. It is of small 

 size and slender, having a length of only 1 3 mil. (Mo- 

 quin-Tandon), and is described by Kiichenmeister as 

 having broad and well-developed segments, and a large, 

 quadrangular head (flat in front, and gradually dimin- 

 ishing in breadth), at the angles of which round discs 

 are placed upon globular elevations. The rostellum 

 is pyriform, and surrounded by a double row of small 

 hooks. No measure of these latter have been given. 

 The neck is slender, and is followed by segments, 

 which gradually become broader, until, at the hinder 

 end of the body, they acquire three or four times the 

 width of the head. 



I can find no. description of its sexual organs ; its 

 eggs are globular, with a thick yellowish capsule, and 

 beneath that a thin, vitelline membrane (Bilharz), 

 within which, in fresh specimens, the six booklets of 

 the Trenioid embryos may be seen. 



5. (Tcenia) Hymenolepis flavopunctata was first de- 

 scribed by Weinland, of Frankfort, while in America, 

 in 1858. It was presented to the Society for Medical 

 Improvement, of Boston, by Dr. Ezra Palmer of that 

 city, in 1842. There were in the phial six different 



