306 



On the Eel-xoorm in Paper-hangers' Paste. 



process just where the spicule swells into tlie head, and this 

 process is connected by a ridge witli the front wall of the 

 head, which carries a lip-shaped process on its anterior edge. 

 The posterior end of each spicule is bifid, like a pair of 

 piticers. There is what appears to be a wing-like expansion 

 attached, in the greatest part of its length, to the ventral 

 edge of the spicule. It also appears to extend round the 

 posterior end, and can be seen when the spicules are extruded. 

 It is very transparent, and its attachments and limits are very 

 difficult to make out with certainty. The accessory piece is 



Fig. 4. 



B 



A. Anguillula rediviva. Spicule and accessoiy piece, much enlarged. 



B. Anguillula aceti. Spicule and accessory piece, mucli enlarged (after 



Man). 



shaped something like the keel of a boat, and does not appear 

 to have a dorsal expansion like that of the accessory piece of 

 A. aceti. 



Habitat. — Tlie worms occur in sour paper-hangers' paste, 

 and can be grown successfully in flour-paste mixtures inocu- 

 lated with some of the original paste. 



In this paper I do not propose to say anything on the 

 biology of the worms ; but the subject is under investigation, 

 and results will be published in due course. 



