1910.] NATURAL SCIENCES OF PHILADELPHIA. 353 



setae of this kind occur on the peristomial parapodium; and on pos- 

 terior parapodia the number is much reduced. Neuropodial setae 

 longer and more slender than in H. cceca and pale yellow or straw-color 

 instead of deep yellow. They are few in number, only from one to 

 three in each series and on middle somites usually only one or two 

 supra-acicular and six (or five) subacicular setae or series of two or 

 three setae. The shafts are nearly or quite as stout as the notopodial 

 setae and the long distal enlargements (fig. 25) arise gradually and are 

 never strongly developed but are longer than in E. cceca. They are 

 only slightly curved and taper gently to rather strongly hooked, acute 

 tips (fig. 26) provided with a prominent, slender and acute accessory 

 tooth which becomes progressively smaller on setae of the more ventral 

 rows and is often absent on the ventralmost. Transverse pectinations 

 are equally close and numerous and only slightly more marked than 

 in E. cceca. 



Elytrophores have the same arrangement as in E. cceca but are 

 rather smaller and more elevated. They are situated far out on the 

 parapodia. The dorsal tubercles (fig. 24) which alternate with the 

 elytrophores project very prominently and their free ends come nearly 

 into contact with the notocirrohores. Elytra have small areas of 

 attachment and are readily displaced, nearly all of them being loose in 

 the known specimens. They are nearly indistinguishable from those 

 of E. cceca but are somewhat more membraneous and delicate. They 

 lack marginal cilia and surface tubercles except for a single triangular 

 area of crowded small ones with its base at the hilum and apex at the 

 scar. The branching nerves radiating excentrically from the scar of 

 attachment are particularly large. 



Entire body pale yellow entirely lacking pigment; all cephalic 

 appendages, cirri and elytra quite colorless. 



Stations 4,400, north of San Diego, lat, 32°, 50 1 N., 118°, 03 1 W., 

 500-507 fathoms, green mud (type and cotype); 4,528, Monterey 

 Bay, Point Pinos Light, 545-800 fathoms, soft gray mud (cotype). 



This species resembles E. cceca in general appearance but differs in 

 many respects and especially in the longer and more slender neuro- 

 podial setae with accessory subterminal tooth. It departs in many 

 ways from the more typical species of Harmothoe, especially in the 

 structure of the parapodium. 

 Harmothoe (Evarne) fragilis sp. nov, PI. XXIX, figs. 29, 30; XXX, figs. 31-33. 



In general resembling Evarne impar Malmgren, moderately depressed, 

 greatest width far forward tapering regularly but only slightly caudad. 

 Length of type 19 mm.; maximum width (VII or VIII), 3 mm.; 



