264 Transactions of the Society. 



correctly described as fixed clusters, in the same sense that Laci- 

 nularia is fixed, although it does affix itself to objects, including 

 the side of the glass bottle. It swims freely in the water as a 

 cluster, and can be gathered in numbers by merely plunging a 

 bottle in the water amongst them. I sent two or three clusters to 

 Mr. Eousselet for identification. 



Ploima Illoricata. 



Triarthra longiseta Ehrenberg. — What was clearly this was 

 found in pools in the Umzinto in January 1904. 



Notommata saccigcra Ehrenberg. — I found a few specimens only 

 of what I supposed was this in February 1902. I could not be 

 quite certain about it. 



Notommata collaris Ehrenberg (not Gosse). — I sent home to 

 Mr. Eousselet in June 1904 a few specimens of a Rotifer that I 

 could not identify, but which he told me were Ehrenberg's Notom- 

 mata collaris — not the species Mr. Gosse has described under that 

 name. They were found in marshy places near Maritzburg, in 

 company with Copeus spicatus, and also with another Copeus that is 

 considered to be new. 



Copeus triangulatus sp. n. (Plate XII., figs. 1, 2). — In June 1904 

 I sent to Mr. Eousselet two or three specimens of an unknown 

 Copeus (to me at least), along with the specimens just mentioned 

 of Notommata collaris ; but they were contracted, and, although 

 of a peculiar form, he was not able to identify them. In 

 June 1905 I tried again to preserve some specimens in a more 

 extended condition, that I might be able to send to him for 

 identification. I also mentioned them to him when he was in 

 Maritzburg with the British Association in August of that year. I 

 understand now from him, since he has had an opportunity of 

 examining the extra specimens, that he has no hesitation in pro- 

 nouncing them to be a new species of Copeus, for which he has 

 suggested the name C. triangulatus, and Mr. Dixon-Nuttall has 

 been good enough to draw the excellent figures illustrating this 

 paper. 



The most conspicuous feature of this fine new Copeus is the 

 shape of the body, the integument of which is expanded in the 

 lumbar region into three large, broad, pyramidal humps, one on 

 each side and the third on the dorsal side, so that a transverse sec- 

 tion of the body in this region forms an equilateral triangle, the 



EXPLANATION OF PLATE XII. 



Fig. 1. — Cojteits triangulatus. Dorsal view, x 130. 

 ,, 2. ,, Contracted, x 165. 



