182 PROCEEDINGS OF THE ACADEMY OF [Vol. LXXV 



ently at XIX crochets appear, forming a small, almost concealed 

 group below the glandular neuropodial thickening. 



Known only from three anterior ends, one each from Stations 

 4431, off Santa Rosa Island, 38-45 fathoms, green mud, coarse 

 gray sand; 4461, off Point Pinos Lighthouse, 285-357 fathoms, 

 green mud; 4541, same locality, 381-633 fathoms, green mud, 

 sand, (type). . , , ^,-,,_ ( ,. , 



Spionides foliata sp. nov. 



Prostomium T-shaped, with a nearly vertical profile, consisting 

 of a broad, sub-crescentic, anterior limb, from the middle of which 

 the gradually narrowing ridge-like longitudinal limb reaches to the 

 second setigerous somite. At the first setigerous somite it bears a 

 small conical tentacle and immediately anterior to this a pair of 

 conspicuous eyes. Peristomium small and completely united with 

 prostomium, forming a pair of lateral wings uniting behind with 

 the parapodia of II and bounding the cirriphoral scars laterally. 

 No peristomial cirri are in place, but several detached ones which 

 fit the scars measure in their contracted state 8 mm. long and 1 

 mm. in diameter just beyond the contracted base; they taper 

 to a bent end and one margin is strongly frilled. 



Body of nearly uniform width, increasing slightly from the head 

 for several segments and then remaining nearly uniform for upwards 

 of one hundred segments, beyond which it tapers very gradually. 

 Segments are all very short, well marked by distinct but shallow 

 furrows, more or less biannulate and with dorsal and ventral 

 surfaces both slightly convex. Caudal end slender, ending in a 

 slightly enlarged sucker-like pygidium bearing twelve small mar- 

 ginal cirri. 



Parapodia begin on II and are strictly lateral, not encroaching 

 upon the dorsum anteriorly. First 3 or 4 smaller but after attaining 

 full size at about the fifth they remain practically unchanged in 

 size to the end of the branchial region. Both rami sessile on body 

 wall, less crowded together than those of S. sacculata, but just 

 appreciably in contact except on the first six or eight which are 

 separated by a distinct interval. Rami similar, each consisting of 

 broad fiat tubercles with small presetal and large foliaceous post- 

 setal lamellae, between which the spreading fan-shaped setae fas- 

 cicles are borne. Anterior neuropodial post-setal lobes are simple 

 ear-shaped lamellse, strongly convex on the lateral margin and 

 tapering to the sides of the body below. Notopodial post-setal 

 lobes are much larger and rise above the dorsum as erect triangular 

 lamellse which in some of the larger specimens arch across the back 

 and nearly meet. Except that they increase in size to a maximum, 

 the parapodia undergo no change to about XI, beyond which 

 they begin to decrease in size coincidently with the appearance of 

 the interpodal membrane and pockets at from XXIX to XXXVII. 



