114 PROCEEDINGS OF THE NATIONAl. MUSEUM vol. loi 



joint about one-fourth the length of second and longest joint. Ter- 

 minal joint with two setae at apex. 



Peraeopods. — See figure 13, c-e. Gnathopod typical, bearing a 

 large tooth on inferior propodal margin and seven rows of three 

 setae on inner surface near anterior end of propodus ; anterior carpal 

 tooth as large as propodal tooth. 



Uropod. — Endopodite not exceeding telson length. Exopodite 

 widened distally and having a sinuate posterolateral margin. 



Second male pleopod. — Stylus with a simple apex with no lobes or 

 setae. 



Types. — Holotype, allotype, and 2 male, 3 female, and 1 juvenile 

 paratypes collected at the type locality, Tomales Bluff (reef) , Tomales 

 Point, Marin County, Calif., June 9, 1948, by R. J. Menzies ; washed 

 with formalin from the holdfast of the alga Laminaria. Type ma- 

 terial has been deposited as follows : 



United States National Museum, holotype male. No. 87706; allo- 

 type, No. 87707; 1 male, 1 female, and 2 juvenile paratypes, Nos. 

 87708-87709. Allan Hancock Foundation, 2 juvenile paratypes. 

 Paciific Marine Station, 2 female paratypes, accession No. 1250 Arth. 



Geographical distribution. — California, from Marin County to 

 Monterey County. 



Material examined. — Specimens were examined that had been col- 

 lected from the following California localities : 



Makin County : Tomales Pointy Tomales Bluff, reef, June 9, 1948 

 (R. J. M.), holotype, allotype, and 6 paratypes; bay side. May 23, 

 1948 (R. J. M.), 2 juveniles. Monterey County : Point Pinos, Jxilj 

 3, 1947 (L. Kellen), 1 juvenile. 



Ecology. — Specimens were collected from the lowest exposed areas 

 of the exposed rocky coast localities. They were found on holdfasts 

 of the algae Egregia and Laminaria. 



Remarks. — This proposed new species differs from the known spe- 

 cies of Cyathura in having small but well developed eyes, in lacking 

 dorsal pits and dorsolateral keels, and in having the stylus of the 

 second male pleopods simple in structure. Of the known species it 

 appears to be most nearly related to Cyathura crucis Barnard. It 

 differs from that species in having a more ovoid telson and a distinctly 

 concave telsonic posterior border. 



Genus COLANTKURA Richardson, 1902 



COLANTHURA SQUAMOSISSIMA, new species 



Figures 14-16 



Holotype. — Male, length 4.5 mm., width at widest part of second 

 peraeon somite 0.4 mm. 



Allotype. — Ovigerous female, length 5.2 mm., width 0.5 mm. 



