PART 1 GARTH : PACIFIC OXYRHYNCHA 437 



rows, and the general surface covered with punctures, crowded together. 

 Two or three small pits in the depression between the branchial and 

 gastric regions. The anterolateral margin behind the cervical sulcus 

 armed with eight triangular, denticulated teeth, the posterior one being 

 a little longer, the others equal in size. Front smooth. Rostrum of mod- 

 erate size, subtriangular, deflexed ; sides slightly concave, unarmed ; apex 

 obtuse. 



Chelipeds long; surface smooth above, except the merus, merus with 

 a median, tuberculated ridge ; edges of merus, carpus, and [manus] 

 armed with small teeth, spiniform on the superior edge of the merus ; 

 outer edge of [manus] with sixteen teeth alternating in size. Below, 

 chelipeds smooth and glabrous except the tuberculated inner edges, the 

 tubercles being small. Sternum with a strongly prominent, almost capi- 

 tate tubercle on each side at the base of the chelipeds, chelipeds also 

 bearing a small tubercle on the basal [segment] ; these four tubercles 

 somewhat flattened at the top and bent forward. 



In the female abdomen the segments each armed with a transverse 

 ridge, more or less developed ; on the second and third [segments] this 

 ridge strongly toothed, and on the penult [segment] appearing in the 

 form of a median tubercle. (Stimpson, modified) 



In the male abdomen the segments each armed with a transverse 

 ridge, more or less developed ; on the second and particularly the third 

 segment this ridge strongly toothed, and on the penult segment appear- 

 ing in the form of a median tubercle. 



Material examined: Sixteen specimens from 10 stations. (See Table 

 93) From Tenacatita Bay, Jalisco, Mexico, to Salango Island, Ecuador. 

 In addition, 3 specimens from 3 Askoy stations, previously reported. 

 (Garth, 1948) 



Measurements: Largest specimen, female: length 20.4 mm, width 

 23.3 mm, rostrum 1.7 mm, width 2.4 mm, cheliped 58 mm, merus 20.5 

 mm, manus 27.2 mm, dactylus 10.6 mm, height of palm 8.5 mm. Male 

 specimen: length 10.7 mm, width 12.3 mm, rostrum 1.5 mm, width 1.7 

 mm, cheliped 26 mm, merus 9.5 mm, manus 13.2 mm, dactylus 5.0 mm, 

 height of palm 4.5 mm. 



Color in life: Carapace light pinkish lilac, small area between gastric 

 and cardiac regions light pink orange, crest of branchial regions pur- 

 plish lilac. Eyes dusky yellowish brown. Chelipeds white with a strong 

 lavender hue. Inside of hand and base of fingers red orange. Ambulatory 

 legs cream color with a brown band on middle of merus and base of 

 carpus and propodus. Ventral side grayish white. ( Petersen, of a speci- 

 men from Tenacatita Bay, Mexico) 



