PART 1 GARTH : PACIFIC OXYRHYNCH A 301 



3a. Three outer marginal teeth on basal antennal article, 

 including anteroexternal tooth. Only one tooth in gape 



of male manus camptacantha 



3b. Only two outer marginal teeth on basal antennal arti- 

 cle, including anteroexternal tooth. Two teeth in gape 

 of male manus. Galapagos only . . . edwardsi 

 2b. Two supraorbital teeth between pre- and postocular teeth. 

 Male first pleopod lacking setiferous fold, although open- 

 ing may be concealed in a loose flap 



4a. First movable antennal article not reaching tip of 

 rostrum. Palm with proximal spinules above. Flap of 

 male first pleopod projecting, triangular . parvifrons 

 4b. First movable article of antenna reaching or exceeding 

 tip of rostrum. Palm entirely smooth. Flap of male first 

 pleopod not projecting, opening concealed within 



tumida 



lb. Ambulatory legs without spines. Orbit non-dentate. Carapace 

 strongly produced posteriorly. Male first pleopod notched at 

 level of spermiducal opening 



5a. Four prominent spines on lateral margin of carapace. Palm 

 of adult male with a spinulous crest. Rostrum longer than 



in 5b. Galapagos only pyriformis 



5b. Numerous scattered small spines on lateral margin of 

 carapace. Palm of adult male with spinulous crest obso- 

 lescent. Rostrum shorter than in 5a . . pubescens 



Herbstia camptacantha (Stimpson) 

 Plate S, Fig. 1; Plate 34, Fig. 1 



Herbstia parvifrons, Stimpson, 1860b, p. 185. (Not H. parvifrons Ran- 

 dall) 



Herbstiella camptacantha Stimpson, 1871a, p. 94. 



Herbstia camptacantha, A. Milne Edwards, 1875, p. 78, pi. 18, fig. 

 3-3e. Rathbun, 1924c, p. 378; 1925, p. 294, pi. 105, figs. 1, 2; 

 pi. 240, figs. 9-13. 



Mithrax armatusf, Lockington, 1877c, p. 70. (Not M. armatus Saus- 

 sure) 



Fisheria depressa Lockington, 1877c, p. 72; type localities, Port Escon- 

 dido and San Jose Island, Gulf of California; types not extant. 

 Herbstia (Herbstiella) depressa, Miers, 1879c, p. 655. 



