PART 1 garth: pacific oxyrhyncha 125 



The range of the species is extended northward to Hughes Point 

 on the west coast of Lower California and to Rocky Point in the Gulf 

 of California, westward to the Revilla Gigedo Islands, shoreward to 

 2 fathoms, and downward to 50 fathoms. The irregularity of distribu- 

 tion should be noted : south of Tres Marias Islands, Mexico, there is 

 no record of occurrence to Secas Islands, Panama. An Askoy capture 

 (Garth, 1948) extends the Velero III series southward from Colombia 

 to Ecuador. 



Podochela margaritaria Rathbun 

 Plate H, Fig. 8 



Podochela mar gar it aria Rathbun, 1902b, p. 283, pi. 12, fig. 2; 1910, 

 p. 570; 1925, p. 43, pi. 15; pi. 209, fig. 1. Boone, 1927, p. 132, 

 fig. 35. Garth, 1946, p. 369, pi. 64, figs. 5, 6. 

 Type: Male holotype, U.S.N.M. No. 24834, length 15 mm, width 



11 mm. 



Type locality: Tagus Cove, Albemarle Island, Galapagos Islands, 



12 fathoms, Hopkins-Stanford expedition. 



Localities subsequently reported, with collectors: Galapagos Is- 

 lands: Albemarle, James, Marchena [Bindloe], Indefatigable, and 

 Hood Islands, 3-70 fathoms, Velero III (Garth). 



Atlantic analogue: None. 



Diagnosis: Rostrum thin, hood-shaped, a sharp median carina. 

 Postorbital granule wanting. Basal article of antenna concave ventrally. 

 First ambulatory leg two and three-quarters times carapace length, 

 dactyl between one-fifth and one-sixth length of propodus. Male manus 

 inflated, spinulous, but not gaping. Sternal plates separated, sternum 

 and bases of legs granulate. Curved hair count 8. Galapagos only. 



Description: Carapace about one and a third times as long as 

 wide, gastric and cardiac regions very high, each surmounted by a 

 tubercle. Hepatic region with a prominent tubercle projecting down- 

 ward below the lateral line. No postorbital lobe. Front long and hood- 

 shaped, posterior part flat and thick, the anterior and outer part thin, 

 hollow beneath and with a sharp median crest above. Marginal crests 

 of the basal segment of the antennae thin and finely denticulate. Ptery- 

 gostomian region armed with a tubercle. Sternum and outer portions 

 of the abdomen covered with pearly granules. 



Palms of the chelipeds strongly inflated ; fingers narrowly gaping 

 when closed. Ambulatory legs diminishing rapidly and uniformly in 



