igoy] Records of the Indian Museum. 241 



anteriorly, and when brought into use are spread out in a fan- 

 shaped manner ; the}' do not, at rest, reach the mouth, and I 

 have not seen them used for prehension of food. The next bundle 

 of setae belongs (y. ant.) to the sixth segment, and is situated about 

 the junction of the middle and posterior thirds of the crop. The 

 two following bundles are placed in the region of the stomach ; 

 other bundles follow segmentally to the posterior end of the body. 



The number of setse in each bundle is ver}^ commonl^^ five ; 

 or, in the second segment, six or seven ; two, three and four are 

 also met with. 



In the only specimen met with which showed sexual organs, 

 the setae of the sixth segment were modified {v. text-fig. 3 B). The}' 

 were shorter, stouter, with well-marked nodulus, not forked, and did 

 not project. In another specimen which, however, had no sexual 

 organs, these setae were shorter than those of the next segment, 

 and did not project as much ; the}' had the usual two prongs. 



The setal sacs are not conspicuous, the internal ends of the 

 setae appearing to be merely connected with a number of fine radiat- 

 ing contractile strands. The setae may be rotated ; the hooked 

 free end pointing sometimes forwards and sometimes backwards, 

 according to the direction of progression, except probabl}' in the 

 case of the first setal bundle. 



Body-cavity . — The body-cavit}' is traversed by septa, of which 

 the first is well-marked, thick and situated behind the pharynx ; 

 the second is thinner and is placed at the beginning of the crop ; 

 these two may be taken as delimiting the second and third segments 

 posteriorly. The next definite septum is near the posterior end of 

 the crop, and there is also a septum at the middle of the stomach ; 

 these show the extent posteriorly of the sixth and seventh segments : 

 septa occur intersegmentally in the posterior part of the animal. 



Besides the septa, there are a number of irregularly placed fine 

 strands passing between alimentar}' canal and bod}"- wall, especiall}' 

 numerous and perhaps contractile in the region of the pharynx. 



On one occasion a number of corpuscles were observed in the 

 body-cavity; these contained a number of colourless, refractile, 

 oil-like globules, of dift'erent sizes, in their substance. Usually, 

 however, the body-cavit}' is free from corpuscles. 



Alimentary canal. — The mouth is large, circular, placed ventro- 

 anteriorh', and reaching as far as the anterior tip of the animal. 

 The buccal cavity {v. text-fig. 4 C) succeeds, with the nerve com- 

 missure round its sides ; the phar^-nx is conspicuous, occupying the 

 second segment, attached by strands to the bod}'- wall, and having 

 normally onl}' a narrow lumen. The oesophagus (text-fig. 2, and pi. 

 ix, fig. i) is a narrow tube leading to the crop ; it occupies almost 

 the whole of the third segment. The crop is the dilated portion 

 of the canal in the fourth, fifth, sixth and part of the seventh seg- 

 ments ; it is usually empty, and its walls are clearer than is the 

 case in the stomach and intestine. A constriction in the seventh 

 segment separates the crop from the stomach, the latter being alsio 

 distinguished from the crop by the number of yellowish , refractile , 



