PART 1 GARTH : PACIFIC OXYRHYNCH A 317 



San Diego County, C. R. Orcutt (Rathbun, 1893a, as Herbstia campta- 

 cantha) ; San Clemente Island, H. N. Lowe (Rathbun, 1925) ; south- 

 ern California, W. H. Dall (Rathbun, 1893a, as Herbstia camptacan- 

 tha). Lower California, Mexico: Off Magdalena Bay, 34-36 fathoms, 

 Albatross (Rathbun, 1893a, as Herbstia camptacantha) . (See Remarks 

 below. ) 



Atlantic analogue: None. A southern California-west coast of Lower 

 California endemic species. 



Diagnosis: Basal antennal article with only two outer marginal teeth 

 including anteroexternal tooth. Two interorbital teeth. First movable 

 article of antenna short, not reaching tip of rostrum. Movable finger of 

 male with one tooth in gape; palm with proximal spinules. Ambulatory 

 legs spinulous. Male first pleopod with a trianguliform subterminal 

 flange protecting opening and spiraling toward pointed tip. 



Description: Carapace ovate, punctate, flattened above, tuberculate, 

 and hairy; gastric region with four inconspicuous tubercles in a trans- 

 verse row in front and a median rounded tubercle on the posterior por- 

 tion ; three or four small tubercles on the cardiac region, and about five 

 or each branchial region ; two tubercles in a transverse line on the intes- 

 tinal area; intestinal area projecting slightly beyond posterior marginal 

 level. Rostral horns very short, one-ninth to one-tenth the length of the 

 carapace. Spine at anteroexternal angle of basal antennal article promi- 

 nent, on margin behind it one spine, with a second spine posterior to it, 

 but lying external to the article. Preocular spine present, acute; two 

 small spines or teeth on the margin of the orbit between the preocular 

 and postocular spines, beloiv the latter a spine on the inferior orbital 

 margin ; beside the postocular tooth the anterolateral margin furnished 

 with about five spines, and several smaller ones above these and on the 

 posterior margin. (Schmitt, modified as indicated by italics) 



Three prominent subhepatic spines and a row of five or six pterygo- 

 stomian spinules. First two movable articles of antenna short, cylindrical ; 

 first article not much more advanced than anteroexternal spine and fall- 

 ing considerably short of rostrum. Merus of external maxilliped broadly 

 produced at internal angle; outer angle spinulous margined. 



Cheliped of adult male more robust than walking legs and exceeding 

 first in length. Merus with five larger spines on superior inner margin 

 and numerous smaller spines external to these ; carpus with ten or eleven 

 spinules; manus with five or six blunt spines on superoproximal border, 

 otherwise smooth and bare ; dactyl with a low denticulate ridge in gape, 

 fingers meeting along distal halves, edges denticulate. 



