PART 1 GARTH : PACIFIC OXYRHYNCHA 129 



Depth: Shore to 10 fathoms. 



Breeding: An ovigerous female measuring 8.0 mm was obtained at 

 Playa Blanca, Costa Rica, in February, 1935, and an 11.0 mm female 

 at Acapulco, Mexico, in February, 1954. 



Remarks: The early confusion of this species with Podochela angulata 

 and this author's care to distinguish one from the other (Garth, 1940, 

 p. 60) appear to have been unnecessary now that Finnegan's species has 

 been identified with certainty and the male described. Actually, P. an- 

 gulata is very close to P. hemphilli, whereas P. zeisenhennci bears little 

 resemblance to either, having a blunt rostrum and short, stout legs with 

 falcate dactyls. The strikingly dissimilar male first pleopod (Plate H, fig. 

 9) bears out this difference. Its relatives are rather P. grossipes and P. 

 macrodera of the Atlantic ; but it does not appear to be strictly analogous 

 to either. 



Genus STENORYNGHUS Lamarck 2 



Leptopodia Leach, 1815a, p. 15; type: Maia sagittaria Leach, 1814= 

 Cancer seticornis Herbst, 1788. Not Leptopodia Leach, 1814, p. 

 431 =Macrcpodia Leach, 1814. 

 Stenorynchus Lamarck, 1818, p. 236 (part). Rathbun, 1897, p. 158 

 (type designated) ; 1925, p. 13. 



Type: The Atlantic Cancer seticornis Herbst, 1788, type of Sten- 

 orynchus Lamarck by subsequent designation of Rathbun, 1897. 



Description: Carapace triangular, longer than broad, smooth. Ros- 

 trum very slender, flattened, longer than the carapace, its lateral margins 

 spinuliferous. Orbits not defined ; postorbital spine small. Eyes short, not 

 retractile. Basal article of antenna very slender; flagellum concealed 

 beneath the rostrum. Epistome very large. Ischium of external maxilli- 

 peds produced at its anterointernal angle; merus somewhat obcordate, 

 bearing the next article at its external angle. Chelipeds long and slender, 

 with merus, carpus, and palm subcylindrical ; fingers much shorter than 

 palm, inner margins dentate. Ambulatory legs extremely long and slender, 

 especially the dactyli. All the legs spinuliferous. 



Abdomen in male six-segmented, in female five-segmented. (Rathbun, 

 1925) 



2 Use of the name Stenorynchus for the genus here treated is contingent upon 

 exercise by the International Commission on Zoological Nomenclature of its 

 plenary powers in validating the generic name Stenorynchus Lamarck, 1818, and 

 the selection by Rathbun (1897) of Cancer seticornis Herbst, 1788, as its type 

 species, as requested by J. S. Garth and L. B. Holthuis, proposal submitted Jan- 

 uary 12, 1953. 



