24 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 5 



(4) The unusual minor chela similar, but longer than in gardineri; 

 in this respect both differ from M. symbiotica Borradaile (1903), the 

 type of the genus, the chelae of which are alike. 



PINNOTHERIDAE 



Genus PARAPINNIXA Holmes 



Parapinnixa glasselli, new species 



Plate 9, Figs. 1-4 



Type: Female, holotype, Cat. No. 77367, U. S. National Museum, 

 and female, paratype, from "roach" trap, Tagus Cove, Albemarle Is- 

 land, Galapagos; February 9, 1933; collected by Allan Hancock Expe- 

 dition of 1933 at Station 66a-33. 



Measurements: Female holotype: length of carapace 2.8 mm., 

 width 6.5 mm. 



Diagnosis: Displacement of first ambulatory leg equal to nearly 

 one-half volume of carapace. Fingers long and slender, gaping when 

 closed, a small tooth near tips. Immovable finger curving well down- 

 ward. Lines separating abdominal segments sinuous. 



Description: Carapace bare and glistening, 2.3 times as broad as 

 long, anterior and posterior margins subparallel. Front depressed, lobes 

 oblique, a groove behind margin, median furrow not reaching edge of 

 front. Due to configuration of front, the eyes appear anterior to it. 

 Orbits almost circular in shape, orbital hiatus occupied by the minute 

 basal antennal article. Antennules folding obliquely. Buccal area an 

 isosceles triangle with the broad base concealed by the first sternal plate. 

 Ischium of third maxilliped rudimentary, merus broadly triangular, 

 exterior margin finely crenulate and bordered with plumose hairs, first 

 segment of three-jointed palpus with outer margin rounded and bearing 

 similar hairs. 



Chelipeds powerful, contours smooth and evenly rounded, carpus 

 and palm of approximately equal width, fingers long and slender, gaping, 

 prehensile edges with a small tooth near tips, immovable finger curved 

 well downward, dactyl a little longer than upper edge of palm. 



First ambulatory leg greatly enlarged, its displacement equal to 

 nearly one half the volume of the carapace, merus deeply excavated to 

 receive cheliped, widening distally, carpus swollen tremendously, nearly 

 as wide as long, propodus narrowing distally, dactylus long and slender. 



