284 



ZOOLOGY. 



of concentrated salt water on railroad bridges in New En- 

 gland. Artemia fertilis Verrill abounds in Great Salt Lake. 



\ 



Pig. 245.77iamnocephalvs platyitms, male, natural si/.e. side antl front view, a, 

 head of the female ; 6, end of the body of the female, showing the ovisac. 



They may often be seen swimming about in pairs, as in 

 Fig. 248. This species has a Nauplius young like that of 



Fig. 2&.Bmnchinecles G'oloradensis Pack. 



the brine-shrimp of Europe (Fig. 244 5). It is a signifi- 

 cant fact, bearing on the question of the origin of species, 

 that, according to Schmankiewitsch, Artemia may change its 



