U. S. NATIONAL MUSEUM 



PROCEEDINGS, VOL. 80, ART. 15 PL. 5 



HEMICYCLOPS AMERICANUS AND OlTHONA BREVICORNIS 



A-H, Ilemicyclops anifrkamis: A, Dorsal view of ffinale; B, second antenna; (', mandible 

 and palp; D, second maxilla; E, maxilliped; F, first swimming leg; G, fourth leg; H, fifth leg. 



I-N, Oithona hrevicornis: I, Dorsal view of female; J, second antenna; K, first maxilla; L, 

 second maxilla; M. maxilliped; N, first swimming leg. 



