36 



THE AMERICAN NATURALIST 



[Vol. XLI 



Family Cyprididw 



Subfamily Cypridinje 



Genus Spirocypris Sharpe, 1903 



1. Spirocypris passaica Sharj)e 



Length 1.54 mm., height 0.7G mm., hreadth ().7S mm. 



Spirocypris passa^m Sharpe, Proc. [ '. S. Xat. Mus., ynl 2(\, 1903, p. 9S2, 

 pi. 66, figs. 1-3. 



This species and genus were described as new from material 

 in the U. S. National Museum, collected at Passaic, New Jersey. 

 There is no other record for it, as far as I know, up to the present. 

 It is especially interesting, therefore, to be able to record this spe- 

 cies from Massachusetts. Several specimens were obtained from 

 Wellesley, Mass., April 20, 1905, collected })y Mr. Irving 1.. Shaw. 



The Massachusetts specimens were very sliglitly smaller than 

 the types but otherwise the specimens agreed veiy well. The 

 peculiar arrangement of the testes in concentric circles is very 

 apparent and striking. The original description gives the furca 

 as 23 times as long as wide. In the specimen measured from 

 Massachusetts the length was 0.486 mm. and the breadth 0.021 

 mm. A closer ratio of 23: 1 could hardly be obtained in such a 

 structure. Further collecting may show this sj)e('ies to be widely 

 distributed in New England. 



Genus Cypkis O. F. Miiller, 1792 

 2. C3rpris virens ( Jnrine) 



