516 PROCEEDINGS OF THE ACADEMY OF [J^lv, 



rently of the first pair which are detached, are somewhat irregularly 

 qua(lratel>''"o\'ate. thick and of a soft, somewhat gelatinoid texture. 

 Their margins are somewhat folded and irregular but without trace of 

 cilia or sensory papillae. The exposed surface is somewhat irregular, 

 the white spots being somewhat raised, but there are no spines or 

 papilla? of any kind. The narrow, transversely elongated area of 

 attachment is situated nearest to the anterior and lateral borders. 



Neuropodial setae form a dense fascicle arranged in 3 supraacicular 

 and 7 subacicular horizontal series. They vary but little, are rather 

 stout but less thickened at the end than in many species ; the pectinated 

 region (fig. 33) is rather extensive and the smooth tip relatively short 

 and strongly hooked. The notopodials (fig. 34) are a close tuft of 

 rather stiff, acutely tapered setae marked with close transverse rows of 

 fine teeth. The peristomial parapodium bears a notopodial process 

 with a small tuft of setae on one side, but lacks it on the other. 



Except for a median series of dull brown spots, one on the posterior 

 margin of each segment, the body is colorless. The cephalic and caudal 

 appendages are all deep brown with white tips, the dorsal cirri with but 

 little l:)rown and the ventral cirri white. The elytra are reddish-brown 

 and white. No pigment is found along the anterior border or on an 

 extensive area anterior to and laterad of this scar. A transverse 

 area of clear reddish-brown passes from j\ist in front of the scar to 

 the median border and is concealed by the preceding scale; from 

 this a mottled brown and white area spreads to and along the median 

 and posterior borders, the brown predominating medially, where it is 

 marked by small, round, discrete white spots, w^hile laterally the white 

 becomes predominant owing to the increase in size, number and con- 

 fluence of the spots. On many elytra there is a narrow, scarcely broken 

 posterior Ijorder of brown. The round white spots are slightly raised, 

 and in the center of each is a small yellowish opaque pigment spot or 

 excretophore. 



The only known specimen was taken from a hermit crab at station 

 4.291. 48 to 65 fathoms, in t^hehkof Strait. 

 Lepidonotus oaeloris Moore. PI. XXXVI. figs. 36, 37. 



This species, originally described from specimens dredged off the 

 coast of Japan, proves to be one of the most abund-ant and generally 

 distributed species throughout the region covered by these explorations. 

 It represents in the Pacific the widely spread L. squamatus of the At- 

 lantic, and in the younger stages resembles that species more closely, 

 but with increasing age and size the fringe of elytral hairs becomes more 

 restricted and the posterior detached tuft is lost. At the same time 



