846 AUStRALiAiJ ftlEStlWATER PLANKTON, 



of an Arthrodesimis, and somewhat retuse above and below, the 

 angles acute, hardly inflated and furnished with a minute spine. 



Tetraedron striatum, n.sp. (PI. Iviii., f.30). 



Cellulae tetraedricee; lateribus valde concavis; angulis baud 

 inflatis in processus angustos breves protractis, extremis trun- 

 catis, transverse striatis. Cell, diam ■26/x. 



Enoggera. 



The cell is tetraedral, with very concave sides, angles not in- 

 flated but produced in short processes, like certain forms of 

 Staurastrtmi; processes narrow, transversely striate (? rows of 

 puncta), ends truncate. 



Tetraedron Wasteneysii, n.sp. (PL Iviii., f.31). 



Cellulfe tetraedricse; lateribus convexis; angulis obtusis in 

 processus breves hyalinos claviformes singulos productis. 



Cell. diam. c. proc. 20, corp. 8|-/;i. Enoggera. 



Named in honour of my erstwhile correspondent, Mr. Hardolph 

 Wasteneys, who sent me the Enoggera-samples. The cell is 

 tetraedral, the body with convex sides; the obtuse angles are 

 produced into short, hyaline, club-shaped processes, with smooth, 

 rounded ends. 



PHYTHELIE^. 



Genus Richteriella Lemm. 



Richteriella botryoides (Schm.) Lemm. (PI. lix., f.l, 2). 



Cell. diam. 3-8; setae long. 20-30//.. 

 Parramatta Park (136). 



Genus Lagerheimia Chodat. 



Including Chodatella Lemmermann. In "Plankton of the 

 Sydney Water-8upply," these Proceedings, 1912, in consideration 

 of their evident connection, one with another, I felt bound to 

 arrange the various forms of Lagerheimia as variations of one 

 species. While just as much as ever convinced of the biological 

 connection, I find this method of nomenclature cumbrous, and of 



