226 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 24 



Megalobrachium festai (Nobili) , new combination 

 Plate 16, fig. 10 ; plate 40, fig. 3 



Porcellanides festae Nobili, 1901b, p. 21 (type locality not designated). 

 Porcellanopsis festae, Rathbun, 1910, p. 601. Chace, 1942, p. 99. 

 Porcellanopsis festai, Haig, 1957b, p. 15 (type locality designated as 

 Bahia de Santa Elena, Ecuador). 



Previous records: Ecuador. Bahia de Santa Elena: E. Festa 

 (Nobili). 



Diagnosis: Carapace covered with small protuberances; broadly tri- 

 angular, with anterolateral margins strongly diverging, antero- and 

 posterolateral margins forming a distinct angle well behind mid-bran- 

 chial level; front with three teeth separated by deep, rounded notches; 

 carpus less than one and a half times as long as wide, anterior margin 

 with a broad, strongly projecting tooth occupying proximal half, sur- 

 face with large protuberances; manus with protuberances; telson with 

 five plates. 



Description: Carapace about as broad as long, broadly triangular, 

 with anterolateral margins strongly diverging posterior to epibranchial 

 angles, antero- and posterolateral margins forming a distinct angle well 

 behind mid-branchial level ; surface granular and punctate, covered with 

 small protuberances defined by grooves; naked or with traces of hair 

 anteriorly. Front strongly projecting beyond eyes, broadly triangular 

 in dorsal view; tridentate or strongly trilobate in frontal view, lateral 

 lobes broad, truncate, median lobe narrow, triangular, pointed at tip, 

 lobes separated by deep, rounded notches, the three about equally pro- 

 jecting. Eyes very small, not visible in dorsal view. 



Movable segments of antenna finely granular, without anterior pro- 

 jections; flagellum shorter than carapace, with short hairs. Outer max- 

 illipeds smooth or punctate. 



Chelipeds covered with coarse granules, naked or lightly pubescent. 

 Merus with protuberances on anterior and posterior margins and on 

 dorsal surface. Carpus less than one and a half times as long as wide, 

 anterior margin with a broad, strongly projecting tooth occupying proxi- 

 mal half; surface with large protuberances. Manus covered with pro- 

 tuberances, outer margin with a series of large granules. Gape of fingers 

 naked. 



Walking legs short and stout, covered with protuberances; merus 

 with a fringe of plumose hairs on anterior margin, other segments with 

 scattered plumose and non-plumose hairs. 



