COMPLETE HAIG: EASTERN PACIFIC PORCELLANIDAE 221 



projecting beyond ej'es, rounded in dorsal view; trilobate in frontal 

 view, lateral lobes broad, truncate or very slightly rounded, median 

 lobe narrow, triangular, separated by shallow, rounded notches from 

 lateral lobes and slightly projecting beyond them. Eyes very small, 

 partly visible in dorsal view. 



Movable segments of antenna pitted and slightly granular ; flagellum 

 naked or with vestigial hairs visible only under magnification. Outer 

 maxillipeds pitted like carapace. 



Chelipeds covered with pits and coarse granules ; naked or with scat- 

 tered plumose hairs. Merus with a broad, granular, strongly project- 

 ing lobe on anterior margin. Carpus about one and a half times as long 

 as wide, anterior margin with a narrow, blunt tooth or small rounded 

 lobe a little proximad of the center; surface with two or three longi- 

 tudinal crests defined by broad grooves, and another along posterior 

 margin. Manus with three longitudinal crests and a fourth along outer 

 margin, these crests defined by broad grooves, in each groove a row 

 of deep pits. Gape of fingers without pubescence. 



Walking legs rather stout, covered with pits like those of carapace; 

 with scattered plumose and non-plumose hairs. Merus, carpus, and pro- 

 podus with crests on anterior margins; carpus and propodus crested 

 on dorsal surface. 



Telson of abdomen with five plates. 



Material examined: See Table 66. 



Measurements : Males, 2.1 to 7.8 mm; non-ovigerous females, 2.5 to 

 6.6 mm; ovigerous females, 3.1 to 6.5 mm. The largest recorded speci- 

 men is the male holotype, which measures 7.8 mm in length, 7.9 mm in 

 width. 



Color: In alcohol, carapace pale orange brown with a broad longi- 

 tudinal white stripe ; tips of fingers white. The white stripe on the cara- 

 pace is not visible in all specimens. 



Ecology: Shore to 4 fathoms, under stones and in coral heads and 

 sponges. The largest number of specimens came from masses of sponge 

 dredged by the Velero IV at Bahia Santa Lucia, Acapulco, in 1-4 

 fathoms. 



Ovigerous females were collected in February and March. 



Remarks: The reference by A. Milne Edwards and Bouvier (1894) 

 to Pachycheles rotundus (p. 291) and rotondus (p. 293, footnote) is 

 apparently the only one in the literature for a porcellanid of that name. 

 Two specimens bearing the name are in the collections of the Paris 



