160 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 18 



Pylopagurus (?) affinis Faxon 



1893 Pylopagurus affinis Faxon, Bull. Mus. Comp. Zool. 24 p. 169. 

 1895 Pylopagurus affinis Faxon, Mem. Mus. Comp. Zool. 18 p. 64, PI. 

 12, figs. 2-2d. 



Type: Male holotype, dredged in 85 fathoms by the Albatross in 

 the Gulf of Panama, Albatross station number 3397, in the Museum of 

 Comparative Zoology, Harvard University. 



Description: Chelipeds dissimilar, unequal, the right much larger; 

 upper margin of carpus armed with two or three spines, the anterior 

 spine largest, outer face of carpus smooth except for a light tubercular 

 ridge along the middle; external (opercular) face flat, covered with 

 minute, spinulous granules, and surrounded by border of sharp spines, 

 the proximal border not sharply defined by spines from basal portion; 

 lower surface of chela smooth. 



Minor cheliped very hirsute; inferior border of chela conspicuously 

 toothed. 



Ambulatory legs hairy; the vasa deferentia are extruded from the 

 base of the fifth leg on each side, appearing as slender threads, the right 

 much longer and twisted. 



Telson symmetrical, subcircular in outline, its posterior border 

 convex and entire. 



Discussion: The preceeding description was adapted from the 

 original description by Faxon (1895). From this, and the very clear 

 figure (pi. XII, fig. 2 C), it is apparent that the extruded vas deferens 

 precludes the assignment of this species to Pylopagurus, or indeed, to any 

 existing genus. The formation of any opinion regarding the placement of 

 this form is probably best reserved until more specimens are examined, 

 since the single male obtained in 1891 is the only report of this form. 



Discussion 



The results of this study indicate that Pylopagurus is predominately 

 a tropical form in the Eastern Pacific as it is in other waters. P. longi- 

 manus and hirtimanus are obviously Panamic species and the information 

 now at hand clearly confirms this assignment for varians and cervicornis. 

 It is also the writer's belief that coronatus, spinicarpus, hancocki, and 

 longicarpus should definitely be considered as belonging to the Panamic 

 fauna, in spite of the small number of existing records many of which 



