Oatty Marine Laboratory^ St. Andrews. 37 



minute yellow gramiles. The small tentacles at the margin 

 of the cephalic lobes keep coiistai.itly coiling, and the animal 

 soon covers itself in a glass vessel with debris of various 

 kinds, and through the meshes of its cover the long delicate 

 tentacles everywhere emerge. These tentacles are ciliated 

 on the ridges and their muscular fibres form meshes, and 

 though no circular coat is apparent the oblique and con- 

 necting fibres would to a large extent supplant them. From 

 the nature of the parts no prominent ventral lip is present, 

 but the narrow part of the tirst glandular ventral scute 

 glides under the ventral flaps of the ceplialic plate and runs 

 into the smooth surface which trends as a shallow groove 

 forward to the mouth. 



'J^he body is more or less dilated anteriorly, sometimes 

 being largely distended, and it tapers posteriorly to the tail, 

 which in the preparations is by no means slender, though iu 

 life it is often much more attenuate. It is rounded dorsally, 

 grooved ventrally, and has. numerous segments, 50-88 or 

 more. Posteriorly it terminates in a crenate anus, the 

 central papilla ventrally being tlie most prominent. Occa- 

 sionally the anus is carried outward on a small process or 

 appendix, but such may be due to regeneration. Anteriorly 

 are thirteen pairs of setigerous processes, and behind these 

 about seventy or more unciuigerous processes, which occupy 

 the ventro-lateral region. 



The segment behind the mouth has a single large glandular 

 ventral scute, narrow in front and broad and rounded pos- 

 teriorly. Then a narrow belt follows, its lateral regions 

 expanding to include the second setigerous processes. 

 Thereafter a median band with a central line passes longi- 

 tudinally backward, cutting the scutes into pairs iu every 

 segment, and of these seven or eight are distinct, each 

 marked by transverse lines. The segments of the posterior 

 region have a deep furrovv in the preparations dividing theiii 

 into two, and each of these is again subdivided into three 

 nairow rings. 



Viewed from the dorsum each setigerous process is 

 dorsally bitid, a feature better marked in the smaller than iu 

 the larger examples, and the bristles issue between the 

 limbs. The first setigerous process has a considerably longer 

 anterior cirrus than those which follow, the posterior process 

 being smaller. In the middle of the body the anterior 

 process is shorter and thicker and the posterior process is 

 more distinct, whilst the last setigerous process in one has a 

 rounded boss on the tip of the thick, short, anterior process, 

 and the posterior is at a greater distance from it and smaller 



