Occasional Powers of the Museum of Zoology 3 



7. Cypris incongruens Ramdohr. — Collected at two sta- 

 tions along Woodruff Creek in the Pinyon Range, August 9. 



8. Cypris testudinaria Sharpe. — Collected among weeds at 

 two stations along Woodruff Creek in the Pinyon Range, 

 August 9. 



AMPHIPODA. 



9. Gaiiintants liiiniaeus Smith. — An abundant species oc- 

 curring in the Humbolt River, Annie Creek, Maggie Creek, 

 and in JMoleen Canyon, July 12 to 30. 



10. Hyalella aateca Saussure. — Numerous among the 

 aquatic plants in ponds near the Humbolt River and along 

 Susan and Maggie Creeks, July 8 to 15. All the specimens in 

 these collections have well developed median dorsal spines at 

 the posterior angles of the first two or three abdominal seg- 

 ments. The number of segments in the flagella of the first 

 antennae of thirty-two individuals collected from Maggie 

 Creek, on July 15. was counted with the following results: 



Males. 



Number of segments in flagellum 10 gun 8 7 



Number of segments in accessory tlagellum y 8 g 10 9 7 8 



Number of animals 4 3 2 i i i i 



Females. 



Num'ber of segments in flagellum 9 10 7 9 8 7 6 6 



Number of segments in accessory flagellum.... 88677556 

 Number of animals 5 4 4 2 i i i i 



11. Hyallela oniata i'earse. — This species was found at 

 higher elevations than the last. It appeared in collections from 

 Annie Creek, July 16, from James Creek. July 29. and from 

 the springs in the Cortez Range, July 9 to 24. The first 

 antennae of the specimens examined do not quite reach to tlie 



