330 PROCEEDINGS OF THE ACADEMY OF [June 



Syllid gen. et sp.? 



A small syllid, probably a true Syllis or Eusyllis, from an unknown 

 station, cannot be identified, and its characters are put on record for 

 the use of a future describer. 

 Length 11 mm., segments 72. 



Prostomium nearly twice as wide as long, rounded laterally, slightly 

 convex anteriorly and nearly straight posteriorly. Eyes very imper- 

 fect (probably abnormal), represented by a minute speck of pigment 

 close to the base of the palp on one side, and a larger but still very small 

 eye with a lens on the other side. No trace of tentacles remains, but 

 it seems very improbable that they should be normally absent in a 

 syllid of this type. Palps projecting forward and curved downward 

 pistally, free, broad, subelliptical, flattened, their length nearly equal 

 to width of prostomium, and their combined width exceeding that of 

 prostomium. 



Peristomium very short above, swelling to a broad lip at the sides 

 and below. An incomplete, strongly moniliform, dorsal tentacular 

 cirrus with seventeen joints remaining exists on one side, but the others 

 are lost. 



Body strongly arched anteriorly, but more flattened behind. First 

 twelve segments very short and separated by deep furrows, the others 

 becoming longer until in the middle region they are one-fourth as long- 

 as wide. Pygidium a very short ring with a slight median lobe, bear- 

 ing a pair of very long, slender, moniliform cirri as long as the last 

 twelve segments and consisting of more than forty joints; in addition 

 there is a very minute unjointed median cirrus. 



Parapodia small, the neuropodia cylindroid, little compressed, 

 truncate, the distal end divided into nearly equal, short, thick, rounded 

 presetal and postsetal lips. Neurocirri rather slender, tapered, un- 

 jointed, blunt, reaching slightly beyond end of neurocirri. Notocirri 

 arising from prominent swellings and small cirrophores well above 

 neuropodia; very long, flexible, very strongly moniliform, alternately 

 longer (on odd-numbered segments) and shorter (even-numbered 

 segments). At the anterior end mostly lost; on middle segments the 

 short ones exceed the width of their segments and have thirty-five or 

 forty joints, the long ones are twice the width of their segments and 

 have fifty to fifty-five joints. Even near the caudal end they are not 

 much shorter, the longest having forty or more joints and the short 

 ones twenty-five or thirty. 



Acicula three or four in a row ending at the dorso-lateral angle, pale 

 yellow, tapered to blunt, slightly knobbed tips. Setse few, seldom 



