ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



353 



Nematohelminthes. 



Study of Acanthocephala.— H. J. Van Cleve {Bull. Nat. Hist. 

 Survey Illinois, 1919, 13, 225-57, 7 pis.). The primary host of Acan- 

 thocephala is usually an Arthropod ; the final host is a Vertebrate ; 

 there may be an intermediate host. The parasites effect mechanical 

 injury, physiological disturbance and actual poisoning. There are but 

 few evidences of a fixed specificity of hosts such as is found in the case 

 of most parasites. A survey is taken of numerous Illinois species ; a 

 new definition is given of the family Neoechinorhynchidge, two new 



Surface view of proboscis of gravid female of Ch-acilisentis gracilisentis, 

 showing the types of hooks and their arrangement. 



genera are established, the question of specific characters is discussed, 

 and a key is given. In Octospinifer n.g. the short globose proboscis 

 has three' circles of eight hooks each; in Oracilisentis n.g. the size is 

 small, the body proper is unarmed, the proboscis has three circles of 

 twelve hooks each, only a small part projects, the hooks of the terminal 

 circle have remarkable root-processes. J. A. T. 



Study of a Nematode. — Thomas Byrd Magath {Trans. Amer. 

 Micr. Soc, 1919, 38, 49-170, 10 pis., 17 figs.). A detailed account is 

 given of the structure of Camallanus americanus sp. n. from the small 

 intestine of various species of turtle. The cuticle consists not of chitin, 



2 B 



