1905.] NATURAL SCIENCES OF PHILADELPHIA. 541 



particularly beautiful specimen has the body nearly without pigment, 

 and the elytra with large irregular spots and a narrow posterior border 

 of reddish-brown. The ventral surface generally and the parapodia, 

 except their dorsal surface, are unicolor, sometimes clear pale brown, 

 often dark brown or purplish or even nearly black, but always uniform 

 and unspotted and highly characteristic. The nem'opodial cirri are 

 always pale and in strong contrast to their dark siuroundings. 



Many of these large-eyed examples are sexually matm-e and, as men- 

 tioned above, it is probable that they represent the epigamous phase, 

 which the long setae indicate may be pelagic. The single small-eyed 

 individual is only 14 mm. long and immature, but the neuropodial setse 

 are elongated and exactly like those of the larger specimens. 



A. -tnacrolepida is quite plentiful at the more northerly stations, but 

 occurs as far south as the Gulf of Georgia, at station 4,192, in 89 to 97 

 fathoms, but also in 293 fathoms in Chatham Strait, from which the 

 t3^pe came at station 4,264. 



HOLOLEPIDA gen. nov. 



The body is much elongated; anteriorly elytra and dorsal cirri alter- 

 nate in the usual manner, but in the middle and posterior regions all 

 segments bear elytra only; a large free nuchal plate overlaps the pros- 

 tomium dorsally 



Hololepida magna sp. nov. PI. XXXV. figs. 24-29. 



Unfortunately but a single specimen represents this interesting 

 species. This is in three pieces, apparently making up the entire worm, 

 as they fit together accurately. If this be the case the total length from 

 the anterior margin of the prostomium to the posterior margin of the 

 pygidium is 250 mm., the number of somites 120 and the arrangement 

 of the elytra as indicated below. The form is elongated and depressed, 

 increasing in width to about XXV, then remaining uniform to about 

 the last 20 segments. 



The prostomium (fig. 24) is twice as wide as long, omitting the ten- 

 tacular prolongations, deeply divided by an anterior cleft and a median 

 dorsal furrow, its posterior border straight and concealed and the lat- 

 eral angles very prominent. Anteriorly it is prolonged into a pair of 

 prominent tentacidar processes in the fashion of Lepidoriotus, though 

 they lie on a somewhat lower plane than in that genus, being slightly 

 ventral to the median tentacle. The two pairs of eyes are very large, 

 occupy the entire postero-lateral portion of the prostomium and their 

 pigment cups are coalesced. Both are blue-black and possess distinct 

 leiLses. The anterior pair looks forward, upward and outward and the 

 posterior upward and backward. The median tentacle arises from a 



