204 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 24 



Chelipeds nearly smooth or lightly granular. Merus with a broad, 

 rugose, strongly projecting lobe on anterior margin, this lobe not tipped 

 with a spine ; a few short scattered plumose hairs along posterior mar- 

 gin. Carpus only slightly longer than wide; anterior margin with a 

 strongly projecting, rounded lobe, anterior and posterior margins con- 

 verging from its highest point ; naked or with traces of pubescence. 

 Palm (as well as fingers) lying in a nearly horizontal plane, broad, 

 dorsal surface flat ; outer margin and outer margin of pollex with a 

 long, thick fringe of plumose hairs, this fringe sometimes short and 

 scattered or completely absent. Gape of fingers without pubescence. 



Walking legs stout, lightly rugose ; merus fringed on anterior mar- 

 gin with plumose hairs, that of leg 3 inflated ; other segments with 

 tufts of plumose and non-plumose hairs. 



Telson of abdomen with seven plates. 



Material examined: See Table 61. 



Measurements: Males, 3.2 to 6.9 mm; non-ovigerous females, 3.3 to 

 6.0 mm; ovigerous females, 5.2 to 8.1 mm. The male holotype measures 

 5.8 mm in length, 5.1 mm in breadth ; a female paratype, 5.6 by 5.1 mm. 



Color: Ground color in life bright lavender, with uniform longi- 

 tudinal stripes of bright orange. Chelipeds bright lavender; legs with a 

 white spot on propodus. Ventral side iridescent, pinkish white; longi- 

 tudinal stripes of carapace continued on first three segments of abdo- 

 men. (Glassell, 1936) 



Ecology: "These little crabs are commensal with the large hermit 

 crab, Petrochirus calif orniensis Bouvier, 1895. The usual association is: 

 the Pagurid host, occupying the shell of Phyllonotus nigritus (Philippi), 

 accompanied by a large Pollonoid worm and a pair of these little Porcel- 

 lanids. At times the inner face of the shell may have a Crepidula nivea 

 Gould, attached, and this in turn may be commensalized with the Pinno- 

 therid, Fabia granti Glassell." (Glassell, 1936) "Appeared in the trays 

 wherein we preserved the large hermit crabs Paguristes digueti." 

 (Steinbeck and Ricketts) Commensalism was not noted for specimens 

 dredged by the Velero III, but shells were collected along with them 

 at two stations (480-35, 481-35) and the organisms may have been asso- 

 ciated. 



The type series was collected by S. A. Glassell at low tide in the 

 littoral; other specimens for which data are available were taken in 

 depths of 2 to 50 fathoms. A substrate of sand and shell seems to be 



