d 



1923] NATURAL SCIENCES OF PHILADELPHIA 257 



/ Nemidia microlepida Moore. 



A caudal end agreeing with the type from Station 4485, off 

 Santa Cruz Lighthouse, 39-108 fathoms, soft green mud and sand. 



Aphrodita castanea Moore. 



Station 4475. 



Euphrosyne hortensis Moore. 



Another young sju'cimen from Station 4463 with the setae so 

 protuded that they project far above the branchiae which they 

 completely conceal. Jr , / 



Nephthys cseca (Fabricius) 



Stations 4366, 4452, 4457 and 4508. 



Nereis paucidentata Moore. 



One example from Station 4546, off Point Pinos Lighthouse, 

 849 fathoms, fine black sand. 



Nereis procera Ehlers. 



The anterior end of an epitokous female filled with eggs from 

 Station 4428 and a very slender example aljout an inch long from 

 Station 4463. The latter retains one ordinary "fish-bone" seta 

 in addition to the characteristic homogomphs throughout the 

 notopodia of the middle region. 



Lumbrineris bifilaris Ehlers 



Station 438 L 



Lumbrineris inflata Moore. 



Station 4431, off Santa Rosa Island, 38-45 fathoms, green and 

 yellow mud, coarse gray sand and rocks; 4445. 



Explanation of Plates XVH, XVIIL 



Unless otherwise stated all figures are drawn from the tj'pes. 



Plate XVII. 



Figs. 1, 2. — Tharyx gracilis. 



Fig. 1. — Lateral view of head region. (X 24) 



Fig. 2. — Two neuropodial setaj in situ, somite L. ( X 250) 



Figs. 3-7. — Acrodrrus crassifilis. 



Fig. 3 — Dorsal view of head region, (x 3.5) 



Fig. 4. — Lateral view of same. ( X 3.5) 



Figs. 5, 6. — Compound seta^ from X and L respectively. ( X 250) 



