186 University of California Publications in Zoology [Vol.23 



Genus Cyclodorippe Milne Edwards and Bouvier 



Carapace subcircular; efferent (excurrent) openings to gill chambers con- 

 tiguous, in a common channel which extends to the frontal margin. Antennules 

 free and long; antennal peduncle narrow. No flagellum on the exopodites of the 

 third maxillipeds. Eyes present, eye-stalks short and stout. Male and female 

 genital openings coxal. 



Cyclodorippe plana Rathbun 



Cyclodorippe plana Eathbun, Amer. Nat., 34, 519, 1900. 

 Clythrocerus planus Eathbun, H. A. E., 10, 168, pi. 9, fig. 4, 1904; Nininger, 

 Jour. Ent. Zool., Pomona Coll., 10, 36, figs. 9 and 10, 1918. 



Fig. 115. a, Cyclodorippe plana, $, X 6; o, Cyclodorippe, <$, sp.?, X 6 (from 

 Eathbun, U. S. N. M.). 



Characters. — Carapace subcircular, a little broader than long; dorsally flat, 

 finely granulate, granules larger toward outer margin; the front is occupied 

 by two triangular lobes, each tipped with a blunt tooth; lobes separated from 

 each other by a broad V -shaped sinus, which is prolonged on dorsal surface by a 

 broad, shallow depression continued to the gastric region; outer margin of each 

 lobe slightly concave; outer orbital tooth narrow, blunt, well marked. A little in 

 front of middle of lateral margin is a tooth somewhat larger than the orbital, 

 directed forward and slightly outward; at one-third the distance from orbital to 

 this branchial tooth is a much smaller triangular tooth directed outward. Anterior 

 end of buccal cavern and of merus of outer maxillipeds project slightly in front 

 of median sinus of front. 



Dimensions. — Type, male: length of carapace to end of horns 3.4 mm., width 

 3.7 mm. ; female : length 2.8 mm., width 3 mm. 



Color. — Carapace speckled with small black spots, in alcohol (Eathbun). 



Type Locality. — Southern California, either at Oatalina or Monterey, doubtless 

 the former, as another specimen has since been collected there. 



