SABELLIDES AND SERPULIDES 



217 



Family ERIOGRAPHIDIDiE. 



MYXICOLA CONJUNCTA sp. nov. 



p1. XXVI, figs. I, 4, a; pi. xxxviii, figs. i-ii. 



Tyfe locality. — Virgin Bay, Prince William Sound. 



In general appearance this species closely resembles the Myxicola 

 steensti'ufi Kroyer from the Bay of Fundy. 



Like that species its body is a pale yellow color, but the pinnae of 

 the branchiae are of a decided brown, which shows through the pale 

 rachises and web, giving a tinge of color to the whole. There is also 

 sometimes a tinge of brown on the thorax. 



The body gradually tapers, both forward and backward, from the 

 end of the thorax, and differs considerably in length in full-grown 

 specimens. The segments, which are well marked, biannular, vary in 

 number from 100 to 115, of which 8 belong to the thorax. 



As the branchiae arise directly from the edge of the first segment, 

 there are no smooth basal portions or lobes visible. There are 20 on 

 each side, which are moderately long and tapered, their rachises con- 

 nected by a membranous web for the greater part of their length, leav- 

 ing comparatively long, slender, unadorned free ends ; pinnae numer- 

 ous, very long and slender. Eyes none. 



There is no collar, but the edge of the first segment is drawn inward 

 on each side on a line with the fascicle of setae, and below it is pro- 

 duced forward into a thin median triangular lobe, to protect the ven- 

 tral branchial opening. A conspicuous membrane arises on each side 

 of the dorsal groove or furrow, passes inward between the dorsal 

 division of the branchiae and around the mouth, forming two loops ; 

 there are no tentacles. 



The dorsal furrow is conspicuous the entire length of the thorax, 

 turns to the right, passes diagonally across the eighth and ninth (first 

 abdominal) segments, and merges into the but faintly indicated ven- 

 tral furrow. 



The fascicles of setae form straight series along the sides of the body, 

 and are at first round and cushion-like in form, but decrease in size 

 and become laterally compressed and somewhat elliptical in form on 

 the succeeding segments. 



On the first segment the setae are of one form, long, with short, 

 rather broad blades terminating' in long slender capillary ends, and 

 are arranged like needles around the edge of a cushion. The setae of 

 the next four segments are similar to these. On the sixth to eighth 

 segments additional, often more slender, spear-shaped or hastate setae 



