158 BULLETIN OF THE 



De Saussure, but the outline of its carapace is very different ; in this regard it 

 is similar to G. ruricola from the] eastern coast. Moreover, the front is nar- 

 rower, deeper, and bent down at a sharper angle than in G. quadratus, and the 

 merus of the outer maxillipeds is very different in shape from that of G. quad- 

 ratus or any other known species. 



Family PINNOTHERID^. 



Pinnixa panamensis, sp. nov. 



Male. — Carapace short and very broad, smooth and punctate for the most 

 part, granulated at the sides. The lateral angles form a prominent shoulder, 

 back of which the carapace diminishes rapidly in width. A transverse depres- 

 sion involves the hinder part of the gastric and the fore part of the cardiac 

 regions. This depression is bounded behind by a ridge which extends across 

 the carapace between the bases of the last pair of thoracic appendages. Back 

 of this ridge the carapace is deflected at an angle of about forty-five degrees. 

 Front depressed, divided by a median notch into two not prominent lobes ; 

 margin setose. The chelipeds are small, with very robust carpus and hand, 

 destitute of spines, but furnished with some sets along their edges ; carpus 

 squamose on the anterior and superior parts of the outer side; jiropodus not 

 broader than the carpus, compressed laterally; a row of tubercles along the su- 

 perior border forms a sort of crest ; a longitudinal row of setiferous squamous 

 tubercles runs lengthwise of the hand from the proximal end, stopping short 

 of the base of the immobile finger ; the surface between this and the dorsal 

 crest is thickly beset with tubercles, but below it the surface is almost smooth 

 down to a row of tubercles which runs along the inferior margin ; immovable 

 finger straight, the dactylus closing against it throughout its length; dactylus 

 furnished with long setae on the upper margin; no prominent teeth or tuber- 

 cles on the cutting edge of either finger. First and second ambulatory limbs 

 of moderate length, nearly naked, with slender and straight dactyli; last three 

 segments tuberculate on superior margin. Third pair very much enlarged ; 

 the merus has a convex anterior border, and is pubescent on the anterior third 

 of the upper surface ; posterior margin double, spinulose. Fourth ambulatory 

 legs very small, not reaching beyond the distal end of the merus of the third 

 pair; upper surface smooth. Dactyli of penultimate and last pairs of legs 

 short, acute, set at an angle with the propodi so as to form prehensile hooks. 

 End joint of abdomen broader than the preceding joint, semicircular. The 

 dactylus of the outer maxillipeds articulates with the propodus near the distal 

 end of the latter. The carapace is 5 mm. long by 10 mm. broad. 



The female is larger than the male, the carapace is more highly polished, the 

 transverse depression not so pronounced, and the appendages are more thickly 

 clothed with setae. Length of carapace, 6.3 mm.; breadth, 13 mm. 



Panama, March 12. 4 males, 6 females ovig. 



