56 J. Shqjhavd: 



Family. — Ptkrodinadae. 



Pterodina. 



*P. intennedia. 



P. patina, Ehrenberg. Treasury Gardens, Melbourne. 



P. reflexa, Gosse. Mr. W. Stickland. 



P. valvata, Hudson. Mr. W, Stickland. 

 *P. trilohata, Shephard. 



A form has been discovered in South Africa which Mr. 

 Rousselet considers specifically identical with this form, though 

 much larger in size. The measurement given in the original 

 description was 1/250 in. or 0.102 mm. The length of the South 

 African form was stated as 1/76 in., or .334 mm. I have had 

 several opportunities of examining specimens of M. trilohata 

 from different localities since the form was first described, and 

 the results of two series of measurements were: — Length of 

 lorica, 0.21 mm. and 0.19 mm. ; breadth, 0.19 mm. and 

 0.18 mm. respectively. 



This form has been collected at Sandringham, Rosstown, and 

 Yarra Glen, some thirty miles apart. Specimens examined quite 

 recently were in close agreement with Mr. Dixon-Nutall's figure 

 in the position of the lateral antennae, the form of the 

 gastric glands, and general appearance, excepting the bosses on 

 the loria, which were absent. 



Family. — Brachioxadae. 



Brachionus. 



*B. riihens. 

 *B. hal-eri. 

 B. haleri, var. hrevisjjina, Rousselet. Heidelberg. 

 B. mulleri, Ehrenberg. Carrum and Warrnambool. In 



brackish water. 

 B. nrreolaris, Ehrenberg. Mr. W. Stickland. 

 B. militaris, Ehrenberg. Heidelberg. 

 B. falcatus, Zacharias. 



This very striking form was found at Willsmere, and com- 

 parison with European specimens kindly sent to me by Mr. 

 Rousselet left no doubt as to its identity. The four very pro- 



