248 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.21 



First ambulatory leg exceeding cheliped in length, its dactyl as long 

 as the propodus. Dactyls of remaining legs shorter, strongly falcate, finely 

 dentate, digital tooth of propodus strong, blunt, and with a hairy tip. 



Abdomen of female with three tubercles on first segment. 



Material examined: The female holotype. In addition a camera 

 lucida sketch of the St. George Expedition female from Charles Island, 

 Galapagos, in the British Museum. 



Measurements: Female holotype: length 7.1 mm, hepatic width 5.3 

 mm, rostrum 2.1 mm. 



Color in life: Unrecorded. 



Habitat : From rocky spit ; among algae. 



Depth: Shore collecting. (Finnegan) 



Remarks: Through the courtesy of Dr. Isabella Gordon of the Brit- 

 ish Museum the writer has before him a camera lucida sketch of the 

 specimen referred by Finnegan (1931, p. 620) to Epialtus peruvianus. 

 It differs from the holotype of Eupleurodon rathbunae in the following 

 minor particulars: the rostrum is shorter and apparently broader, the 

 orbital margins slightly concave rather than convex, the anterolateral 

 margins more nearly horizontal and less oblique, and the hepatic lobes 

 broader and less forward pointing. The walking leg shows the same 

 strong propodal thumb. 



Although a different interpretation is now placed upon the character- 

 ization of Eupleurodon trifurcatus Stimpson than formerly (see Remarks 

 under that species), insufficient information is available to determine 

 whether or not the differences exhibited by the Galapagos specimens now 

 referred to E. rathbunae fall within the normal range of variation of 

 Stimpson's species. It is felt that males of the two will finally determine 

 whether or not E. rathbunae should be made a synonym of E. trifurcatus. 



Subfamily PlSINAE 



Pisinae Alcock, 1895, pp. 165, 200. Balss, 1929, p. 11. 



Pisinae, sensu restr., + Hyasteniinae Balss, 1929, pp. 11, 14. Stephensen, 



1945, p. 218. 

 Blastidae Stebbing, 1905, p. 25. 



Eyes with commencing orbits, one of the most characteristic parts 

 being a large, blunt, usually isolated and cupped postocular tooth or lobe 

 into which the eye is retractile, but never to such an extent as to com- 

 pletely conceal the cornea from dorsal view ; also almost always a promi- 

 nent supraocular eave, the anterior angle sometimes produced forwards 



