186 University of California Publications in Zoology [Vou. 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 Rathbun, Amer. Nat., 34, 519, 1900. 
Clythrocerus planus Rathbun, H. A. E., 10, 168, pl. 9, fig. 4, 1904; Nininger, 
Jour. Ent. Zool., Pomona Coll., 10, 36, figs. 9 and 10, 1918. 
Fig. 115. a, Cyclodorippe plana, 8, X 6; b, Cyclodorippe, 3, sp.?, X 6 (from 
Rathbun, U. 8. N. M.). 
Characters.—Carapace subcireular, 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 buecal 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 (Rathbun). 
Type Locality—Southern California, either at Catalina or Monterey, doubtless 
the former, as another specimen has since been collected there. 
