324 



PROCEEDINGS OF THE ACADEMY OF 



[June^ 



All of the appendages are strongly moniliform. The tentacles are 

 rather stout but gently tapered. The median arises between the eyes, 

 is nearly twice the length of prostomiuni and palpi and consists of 22 to 

 30 joints. The lateral tentacles arise from the antero-lateral face of 

 the prostomiuni, are H times as long as the latter plus the palps and 

 consist of about 20 joints. The perjstomial cirri are quite similar in 

 form, the dorsal consisting of about 20 to 25 joints and equalhng the 

 median tentacle and the ventral consisting of 15 joints and equalling 



Syllis alternata — a, cephalic region from above, X 24; 6, parapodium X, X 32; 

 c, parapodium LI, X 32; d, a moderately long-bladed seta from the dorsal 

 part of parapodium X, X 600; e, a short-bladed seta from the ventral part 

 of the same, X 600; /, ends of two acicula, X 600. 



the lateral tentacle in length. The first dorsal cirrus is very long, 

 especially on the type, in which it has about 35 joints. 

 • The parapodia (6 and c) are rather stout and short, blunt and broadly 

 roimded distally. Ventral cirri are slender, unjointed, little tapered 

 and reach beyond the end of the neuropodium. The dorsal cirri, on 

 the other hand, are all very strongly moniliform and gently tapered 

 throughout. They are longest and nearly uniform on the anterior 15 

 segments, on which they nearly equal the diameter of the body. 

 Farther back they are alternately long and short, but never equal to 

 the anterior ones. From about 25 and 18 respectively in this region 

 the number of joints becomes reduced at the caudal end quite rapidly 



