538 PROCEEDINGS OF THE ACADEMY OF [July, 



podial setse; they are closely pectinated with | rings of fine spines, 

 leaving a smooth tip somewhat less in length than the greatest diam- 

 eter of the seta. 



The body throughout is colorless, the exposed parts of the elytra 

 mottled with white and rich brown, the caudal cirri, dorsal cirri and 

 cephalic appendages brown with a subterminal white ring and light 

 filament, the palpi only lacking the ring but retaining the white tip. 



This species is represented by four examples, the type from station 

 4,261, Dundas Bay, 8-10 fathoms, and one specimen each from Union 

 Bay, Alaska, and from station 4,270, Afognak Bay, 14-19 fathoms. 

 The latter is labelled "Hermit crab, messmate," and many of the papillse 

 on the elytra bear 2 or .3 spines. 

 Antmoe macrolepida sp. nov. PI. XXXV, figs. 21-23. 



This fine species has a length up to 45 mm. with a breadth of 12 mm. 

 and including the setai of 18 mm. 



The short broad prostomium (fig. 21) is about H times as broad as 

 long, smoothly rounded laterally, broadly cleft and bilobate anteriorly 

 and slightly divided for its entire length by a shallow, dorsal, median 

 furrow. The anterior lobes are broadly rounded and largely occupied 

 by the anterior eyes and the cephalic peaks, usually prominent in the 

 genus, are in this species nearly obsolete. In one small specimen of 

 14 mm., however, they present the ordinary appearance, and, as the 

 eyes are small, it seems quite probable that in the species as here de- 

 scribed we have to do with an epigamous phase in which the great 

 development of the anterior eyes has mechanically or otherwise reduced 

 the size of the peaks. The anterior eyes are very large, provided with 

 well-developed lenses, and occupy the entire antero-lateral aspect of 

 the prostomium, facing forward and outward. The posterior eyes 

 appear by comparison minute, and are widely separated on the pos- 

 tero-lateral curvature of the prostomium; in the preserved specimens 

 they are always partly hidden by the bases of the elytrophores of 

 somite II. 



The median tentacle is long and slender, 5 or 6 times the length of 

 the prostomium; its ceratophore is more than ^ as long as the latter, 

 and the delicate style tapers regularly to the outer ^ where a slight 

 thickening occurs followed by a slender terminal filament. It bears a 

 few scattered clavate cilia. The very small lateral tentacles spring 

 from short, nearly spherical ceratophores situated on the ventral sur- 

 face of the anterior prostomial lobes and partly beneath the median 

 tentacle. Their total length is only 1^ times the prostomium and their 

 slender subulate styles have the terminal half almost filamentous. The 



