Vol. 3] Esterly. — Co'pepod Fauna. 73 



Occurrence : Three males and three females, winter trip to 

 San Clemente. Types in the collection of the University of Cali- 

 fornia. 



Genus Augaptilus Giesbrecht. 



Augaptilus, Giesbrecht ('92), p. 65, 400; ('98), p. 120. 

 Augaptihis, Esterly (:05), p. 187. 



Augaptilus rostratus n. sp. 



PI. 9, fig. 19; pi. 11, fig. 42; pL 12, figs. 57, 63; pi. 13, fig. 75. 



Female : Head rounded, rostrum bifid, the prongs short and 

 hooked (PI. 9, fig. 19). Cephalothorax of 5 segments, abdomen 

 of three, genital segment five times as long as second (PL 11, fig. 

 42), anal three times as long as second; furca symmetrical, rami 

 about twice as long as broad. Anterior antennae 25-jointed, ex- 

 tending beyond furca for one-fourth their length. Inner ramus 

 of posterior antenna much longer than outer ; mandible biramons, 

 blade (PL 12, fig. 57) long, with three teeth; first outer marginal 

 lobe of maxilla with nine bristles, first inner marginal with eleven, 

 outer ramus with two, second basal plus inner ramus with one; 

 bristles of maxillipeds with characteristic armature. Swimming 

 feet not unusual, outer marginal bristle of first joint of outer 

 ramus of first foot extending beyond distal end of terminal joint 

 (PL 12, fig. 63). Rami of fifth feet 3- jointed, terminal joint of 

 outer ramus with two outer marginals and three inner marginals ; 

 outer marginal of second basal very long and slender (PL 13, 

 fig. 75). 



Length : Female, 6.8 mm. 



Coloration : Translucent, without pigment, except for broAvn 

 in the mouth region. 



Occurrence : One female. Coll. 1030. Type in the collection 

 of the University of California. 



Genus Arietellus Giesbrecht. 



Arietellus, Giesbrecht ('92), p. 66, 415; ('98), p. 124. 

 Arietellus, Esterly (:05), p. 189. 



