1906.] NATURAL SCIENCES OF PHILADELPHIA. 221 



II, related to the second tentacular cirrus, is rudimentary and achae- 

 tous ; that on III is larger, perfectly formed and bears setse. The others 

 have the form shown in fig. 5 and bear foliaceous dorsal cirri. When 

 fully developed they are sharply marked off from the ventral glandular 

 swellings by distinct lateral grooves. The notopodium is of course 

 wanting, and the neuropodium is a small somewhat flattened process 

 divided distally into a very small postsetal and a decidedly longer 

 presetal lobe, from between which the single vertical series of setae 

 projects. Each lobe is notched on the edge at the point where the 

 single .straight slender aciculum reaches the surface. The neuropodial 

 cirrus is prominent from III back and is a short, rather thick process 

 attached to the posterior side of the base of the neuropodium. In 

 the middle region it is somewhat foliaceous and reaches to the tip of 

 the neuropodium; in form it is triangular with the broad, somewhat 

 convex base ventral and the apex dorsal, while the attachment is by 

 one of the short sides. Posteriorly they become more slender and 

 project distinctly beyond the end of the neuropodium. 



The dorsal cirri (fig, 5) are prominent and foliaceous throughout. 

 They arise from stout bases situated a short distance dorsal to the 

 neuropodia, which they in most cases exceed in size. All of the cirri 

 have their fibrous and glandular structures arranged pinnately along 

 an axial core. Anteriorly the cirri are rather broadly lanceolate with 

 acuminate, somewhat recurved tips; posteriorly they become more 

 slender and elongated; and finally are very narrowly lanceolate and 

 of a length exceeding the diameter of the body. At the same time 

 their foliaceous character is gradually lost. 



About thirty setae, equally divided between the supraacicular and 

 subacicular groups, form the vertical fan-like fascicle. They are of 

 the usual compound form (fig. 6) with the transparent, colorless stems 

 rather stouter than those of E^ longicornuta, the thickened and nearly 

 truncate end furnished on each side with seven or eight slender teeth, 

 one of which is much larger than the others. The blades are short, 

 broad at the base, and rather conspicuously striated and fringed. 



The type specimen, a female filled with large eggs, retains a dull olive 

 color throughout the l^ody, becoming brown on the dorsal cirri. Be- 

 sides the black pigment in the eyes, there is a diffuse spot near the tip 

 of each dorsal cirrus, and a very minute spot beneath each ganglion 

 of the ventral chain. The cotype shows some indications of a faint 

 transverse band across the dorsum of each segment. 



The type and cotype are from Quarantine Rock, Port Townsend, 

 Washington, June 27, 1903. 



