C. F. ROUSSELET ON DIPLOl's TRIGONA. 123 



and form valuable helps in the identification of obscure species. 

 The little jerks forward, regular and without apparent reason, are 

 very characteristic of this species. 



Size T-4-rr, of which the foot is a little less than one-third. 



A mounted slide of this species will also be placed in the 

 cabinet of the Club. 



Diaschiza megalocephala (Glascott), PI. VII., Fig. 5. 



At the Club's excursion to Totteridge on the 4th of May last I 

 found a Rotifer which I think I can identify with Miss Glascott's 

 Furcularia megalocephala. Her description of the animal is good 

 as far as it goes, but her figure is hardly sufficient for recogni- 

 tion. 



The most prominent feature of this species is the very large 

 head, which is larger and broader than the body. The body is 

 compressed laterally, higher than broad ; the face is very oblique, 

 and the whole front densely ciliated ; two bundles of larger cilia 

 or styles are placed on the frontal part of the head. Behind the 

 head the body becomes sensibly narrower, and tapers thence to the 

 short two-jointed foot and toes, which are of moderate size, 

 decurved and finely pointed. The body behind the head seems 

 invested with a very thin and flexible, but distinct, lorica, slit 

 dorsally and open ventrally. The possession of this lorica makes 

 this species a Diaschiza, to which genus I therefore transfer it. 

 The mastax is large and peculiar, the rami having the appearance 

 of an angular forceps, and the jaws look as if they could be pro- 

 jected out of the centre of the face with a snap, as stated by Miss 

 Glascott, but this I have not seen done. Having only a single 

 specimen, which I mounted, I have not had an opportunity of 

 dissolving out the jaws and making out all the details of their 

 structure. There is a long tubular brain, but I could detect no 

 eye. The alimentary canal, ovary, and contractile vesicle are all 

 normal. The dorsal and lateral antennas were not observed, and I 

 neglected to search for them. The whole body of my animal was 

 very white and hyaline, with no food in the stomach, and it may 

 have been a young one, especially as the size was somewhat less 

 than that given by Miss Glascott. 



Size, according to Miss Glascott, about y^, whilst my animal 

 measured, total yi^, of which the toes formed about one-sixth. 



