SOME JERSEY OLIGOCBjETS. 461 



Salivaries slender and forked like certain species of Fridericia. 

 Girdle from 12 to 1/2 13 with dense gland cells rendering it 

 opaque. Septal glands of three pairs not of the normal shape. 

 Two kinds of ccelomic corpuscles. Brain convex behind as 

 in Fridericia. SpermathecaB with duct longer than bulb and 

 ampulla, and possessing a pair of large glands at the 4/5 

 opening. Ampullae fairly large, about 3x1 with long irregularly 

 coiled duct, and considerable atrial gland and large male pores. 

 Nerve enlarged somewhat in segments 2-3. Nephridia with long 

 duct from near the septum. 



It will be seen that some of the characters are decidedly 

 Friderician, while in some respects the creature resembles H. 

 multispinosa. It is distinguished from all other British forms by 

 the position of the dorsal vessel ; while the setse, spermathecse, 

 salivaries, brain and other characters serve to separate it from 

 others. Now described for the first time. The trivial name is 

 in allusion to the habitat. 



2. Henlea parva (?), Friend. 



Description. — Length about 6-8 mm. Segments 35-40. 

 Setse 5-7, shortest in the middle of the bundle. Bulb in 

 segment 8, dorsal vessel arising in the middle of segment 9. 

 No oesophageal glands or salivaries. Brain not deeply incised, 

 but slightly concave behind. Girdle 12 to 1/2 13. Spermathecse 

 short, simple ducts gradually narrowing towards the intestine. 

 Ampullse small, about 2x1. Nephridia with small anteseptal 

 and large postseptal, but origin of duct could not be discovered. 

 Three pairs of septals and ccelomic corpuscles like those of 

 Fridericia. 



This comes very near H. parva, Friend, and I have therefore 

 refrained from giving it a separate name. More material is 

 needed before a final decision can be reached. See Trans. 

 Notts. Nat. Soc, 1911-12, p. 60. 



The genus Mesenchytrceus is but poorly represented with us. 

 In Jersey two species occur. M. setosus has already been 

 reported for other localities. The following paragraph refers to 

 a species not found previously in Great Britain, and, so far as I 

 can judge, equally new to science. 



