230 The American Naturalist. 



tion, among which the author distinguished, fatty globular masses and 

 rhombohedral crystals of hjematoidin. In others, there are vacuoles, 

 containing protoplasmic matter which differs from the rest of the 

 endoplasm. It is in the endoplasm also that the nuclear elements are 

 found, often in great number, around which the spores develop. The 

 author traces the development of these spores, describing minutely 

 the various stages of growth. Upon arriving at maturity they remain 

 enclosed in the endoplasm for a varying length of time. When set 

 free it seems to be connected with the destruction of the protoplasm 

 which persists in the mother organism after the formation of the spores. 

 The free-swimming species are expelled from the host either with the 

 faeces or the urine, but the ones imprisoned in the tissues continue 

 where they are until set free by the death and subsequent decay of the 

 tissues of the host. The spores rarely germinate in the old host, never 

 in any exterior medium, but stay dormant until chance provides them 

 a new host. 



As to the food habits of the Myxosporida, ML Thelohan observa- 

 tions are to the effect that they imbibe nourishment from the fluids in 

 which they live. In no case did he see food particles ingested. 



The following classification of the Myxosporida was proposed by 

 the author in 1892, and his subsequent researches confirms the distin- 

 guishing characters. 



r no vacuoles in f 2 capsules. I. Myxidiidse. 

 the plasma. \ 4 capsules. II. Chloromyxida?. 

 form I 



pyriform, a single polar cap- 



able with iodine, at the 



5 species; Chloromyxidse has 1 

 , 14 species ; Glugeidse 3 genera, 

 lb' species. 



The Segmentation of the Hexapod Body.— In a recent 



paper 1 giving the results of work upon the early stages of certain of 



the Orthoptera, Dr. Heymons gives the whole number of segments in 



the Hexapod body as twenty-one, of which six form the head ; three, the 



1 Anhang. Abh. K. prenss. Akad. Wiss., Berlin, 1895. 



