218 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 24 



ington 6-99 (Type)." This specimen, one of two so labelled, is hereby 

 selected as the lectotype of the present species (see Remarks). 



Diagnosis: Carapace nearly smooth; lateral margins rounded; front 

 with three lobes separated by shallow rounded notches; carpus about 

 one and a half times as long as wide, anterior margin with a narrow, 

 blunt tooth on proximal third, surface with longitudinal crests; manus 

 with longitudinal crests; telson with seven plates. 



Description: Carapace about as broad as long, lateral margins 

 rounded ; surface covered with punctae and fine granules, the latter 

 most distinct on ephibranchial regions; naked or with traces of hair 

 anteriorly. Front strongly projecting beyond eyes, rounded in dorsal 

 view; trilobate in frontal view, lateral lobes broad, rounded, median 

 lobe narrow, triangular, lobes separated by shallow rounded notches. 

 Eyes very small, partly visible in dorsal view. 



Movable segments of antenna granular, first with a slight projec- 

 tion on anterior margin ; flagellum naked or with vestigial hairs visible 

 only under magnification. Outer maxillipeds punctate. 



Chelipeds covered with coarse granules, naked or with traces of 

 hair. Merus armed on anterior margin with a low granular lobe. Carpus 

 about one and a half times as long as wide, anterior margin with a nar- 

 row, blunt tooth on proximal third ; surface with three longitudinal 

 crests, sometimes very strongly marked, and a fourth along posterior 

 margin, these crests defined by broad grooves. Manus with three crests 

 on dorsal surface, often strong as in carpus, and a fourth along outer 

 margin, these crests defined by broad grooves. Gape of fingers devoid 

 of pubescence. 



Walking legs rather slender, finely granular, with scattered short 

 plumose and non-plumose hairs. 



Telson of abdomen with seven plates. 



Material examined: See Table 65. 



Measurements: Males, 1.9 to 5.9 mm; non-ovigerous females, 2.2 

 to 6.0 mm; ovigerous female, 4.5 mm. Lockington's largest specimen 

 was said to measure 5.5 mm in length, but this specimen may have 

 been M. garthi (see Remarks). The lectotype here selected is a female, 

 4.0 by 4.4 mm. Glassell's male neotype is 6 mm in length, 6 mm in 

 width; his female neoallotype, 4.5 by 5.0 mm. 



Color: The color in life varies from light cream to buff; ventral 

 side slightly iridescent. (Glassell, 1937) "One of the vividly white crabs 



