PART 1 GARTH : PACIFIC OXYRHYNCH A 421 



extending from the sides of the cardiac elevation to the smaller marginal 

 tooth, postlateral in position. No anterior lateral protuberance. A ridge 

 of granules defining the intestinal region. 



Basal antennal article broad, produced anteroexternally, and termi- 

 nating in a granule resembling a tooth. External maxilliped with merus 

 longer than ischium, outer external angle greatly expanded and rounded, 

 palp appearing to arise from midpoint of concave inner surface. Palpus 

 with first segment broadened slightly, second cylindrical, third insignifi- 

 cant; all three segments hairy. 



Male cheliped weak, manus slightly compressed, tapering distally, 

 fingers slender, incurving, denticulate, tips almost spooned. Ambulatory 

 legs short, decreasing regularly in length from first to last; meral seg- 

 ments but moderately broadened for the genus; posterior margins of 

 lamellae differing from anterior only by their coarser denticulation, a 

 median granulate ridge extending the length of each merus; carpi simi- 

 larly ridged ; propodi likewise ridged but without granules ; denticles 

 strongly curved, tips corneous. 



Male abdomen with seven free segments, the last four slender; tip 

 narrowly triangular. Male first pleopod slender, tapering to a blunt 

 point extending little beyond aperture, lateral flanges not present. (See 

 Plate Y, fig. 6) 



Material examined: 14 specimens from 6 stations, all but one in the 

 Gulf of California. (See Table 89) From Isla Partida to San Gabriel 

 Bay, Espiritu Santo Island, Gulf of California ; Tenacatita Bay, Jalisco, 

 Mexico. 



Measurements: Male specimen: length 8.0 mm, width 6.4 mm, 

 length of rostrum 0.9 mm, width 1.2 mm, cheliped 5.0 mm, chela 2.2 

 mm, dactyl 0.85 mm, height of palm 0.55 mm, walking legs 6.5, 6.0, 

 5.5, and 4.8 mm, respectively. Female specimen: length 8.4 mm, width 

 7.0 mm. 



Color in life: Unrecorded. 



Habitat: Mud with shell and sand; rock with sand. 



Depth: 1-35 fathoms. 



Size and sex: Males in the present series range from 4.7 to 8.0 mm, 

 females from 5.0 to 8.7 mm, ovigerous females from 6.4 to 8.0 mm. 



Breeding: Ovigerous females were encountered by the Velero III 

 in May and by the Velero IV in March in the Gulf of California. 



Remarks: It is believed that the above redescription is warranted in 

 view of the fact that the original description, based upon the erroneous 

 assumption that Hemus analogus was the Pacific analogue of H. cris- 



