242 



THE AMERICAN NATURALIST 



[Vol. XL 



I have also observed all the species in Miss Rathbun's list 

 except Heterocope and Cyclops prasinus. Eurytemora afjinis has 

 never been observed before in America outside the Gulf of Mexico 

 (Foster, :04). The previous eastern range of Diaptomus ash- 

 landi is Indiana; Diaptomus massachusettsensis and Diaptomus 

 spatulocrenatus are apparently new to science. The ranges of all 

 the species of Canthocamptus here listed, are considerably ex- 

 tended. The ranges of several species of Cyclops are widened 

 somewhat but this is of no very great significance as it is a cos- 

 mopolitan genus and all the species have been previously found 

 in the United States. 



]My thanks are rendered to J. A. Cushman for specimens from 

 various stations and for collections from Nantucket Island which 

 were made by Mariana Hussey, E. W. Morgan, and S. D. Rich- 

 mond. I am also indebted to I. L. Shaw for specimens from 

 Brookline, Wellesley, and Randolph. 



The types of the new species here described have been pre- 

 sented to the -Boston Society of Natural History. 



Genus Eurytemora Giesbrecht 

 Eurytemora afEinis Popj)e. — Ihis species occurred m a collec- 

 tion from Scjuam Pond. Nantucket Island, made bv S. D. Rich- 

 Genus Epischura Porbes 

 Epischura massachusettsensis n. sp. 

 Ihis species is described from nine females collected by I. L. 

 Shaw at ^\ellesley, Mass.. April 20. 1905. No males were taken 

 at that time nor in October when several dredgings were made. 

 Description.— Of medium size, rephalothorax elli{)ti('al seen from above. 



