CONSTITUTION AND DEVELOPMENT OP TERMITES. 45 



contractile vacuoles, and possesses a large nucleus in the 

 neighbourhood of the flagellar tuft. It exhibits, however, the 

 following important diflferences : 



1. Instead of the denser and more opaque protoplasmic 

 region occupying the anterior half of the body of Lopho- 

 monas, it possesses a complex endoskeleton, which seems of 

 cuticular substance, and lies nearly in its long axis. This 

 consists of — 



(«) A rod similar to that found in Trichomonas, and 

 tapering posteriorly. Anteriorly it is widened and bilaterally 

 symmetrical, owing to the presence of a recess which lodges a 

 large part of the nucleus. 



(b) Numerous curved and claviforra rodlets, which appear to 

 be inserted into the anterior end of the rod by their lesser 

 extremities, so as to form an encircling ring, which is incom- 

 plete, owing to their absence over a small portion. This circle 

 of rodlets sometimes exhibits a bilateral symmetry, which does 

 not, however, correspond with that of the rod. At times a 

 filament may be observed apparently to connect the rod with 

 the base of the flagellar tuft ; I do not know whether this should 

 not be considered part of the endoskeleton. 



2. The posterior part of the body is ciliated in Joenia, and 

 the cilia are never motile. 



Joenia feeds on particles of wood, which it ingests in a 

 manner not yet determined, and which may exceed half its 

 body in length or bulk. Ingestion and elimination of dejecta 

 probably take place at the anterior half of the body, except 

 over the flagellate area, and are accompanied with amoeboid 

 movements. 



II. 



Trichonympha agilis, Leidy (PI. 20, figs. 1 — 5.) Leidy, 

 ' Proc. Ac. Sci. Phil.,' 1877, p. 147. 



Heaching the dimensions of Joenia, variable in shape, 

 sometimes oval, sometimes transversely constricted into two 

 unequal portions at the level of the front of the nucleus. The 



