140 AUSTRALIAN FRESHWATER FliAGELLATES, 



trailer noted. Three deeply excavated longitudinal ridges run down both the 

 upper and under face, the central one somewhat spiral. End view subrect- 

 angular, with 3 strongly marked ridges front and back, the other two sides 

 slightly hollowed. Side view broadly fusiform or lenticular. Membrane smooth; 

 cytoplasm hyaline, transparent, homogeneous. No paramylum, no granulation 

 of the ridges. 



Sphenomokas spiralis, n.sp. (PL ix., fig. 2). 



Cellulae ambitu late-fusiformes, superne acutae, interne obtusae; rugis 

 spiralibus 5 — G paene transvei-se dispositis alte excavatae; meinbrana glabra; 

 cytoplasmate retraeto, granulato, hyalino; flagello recto, crasso, interdum secundo 

 retrorsum directo. 



Long. 40, lat. 34/i. Botanic Gardens, Sydney (15fi). 



Broadly lenticular in general outline, pointed above, obtuse below, deeply 

 scored by 5 or (5 spiral ridges laid almost horizontally and from left to right. 

 Membrane smooth; cytopla.sm retracted, hyaline, granular; a stout flagellum 

 directed straight forward, sometimes also a trailer. 



Var. axgusta, n.var. (PI. ix.. fig. 3). 



Cellulae ambitu longe-ovales ; utroque polo obtusae infra nmrginem spina 

 praeditae; rugis si^iralibus 3 — 4 oblique dispositis alte excavatae; cytoplasmate 

 baud retraeto; ceteris ut in forma tyi>ica. 



Long. 40, lat. 21^. Lismore. 



General outline long oval; obtuse at each end, with a sharp point within 

 the margin; only 3 — 4 ridges spirally and obliquely wound; cytoplasm not re- 

 tracted; a flagellura and a trailer observed. 



Sphenomonas MiRACiLis, n.sp. (PI. ix., figs. 4, 5). 



Cellulae oblongae, utroque ])olo rotundatae; costis spiralibus 6 oblique vel 

 per longitudinem dispositis ornatae; membrana glabra, costis baud granulatis; 

 cytoplasmate retraeto, hyalino, granulato; flagello valido recto. 



Long. 34- -36, lat. 18—23^.' Lismore (328, 345, 365). 



Cell oblong, rounded at each end; membrane smooth, ridged l)y 6 sharp- 

 edged spiral costae longitudinally and more or less obli()uely wound and from 

 right to left (the opposite way to Sjili. spiralis). Cytoplasm retracted, liyaline, 

 granulate, flagellum stout, straiglit. no trailer noted. End view circular. 



Fain. PERANEMACEAE. 



Genus P e r a n e m a (Ehr.) Stein. 



Peranema TRiooPHORUM (Ehr.) forma. (PI. ix., fig. (i). 



Forma angusta arcuata. Long. 50, lat. 10/x. 



I doubt if I have ever seen the type of this species. The European form 

 is fusiform. The specimen figured is narrower and arched. Botanic Gardens, 

 Sydney (15G). Cf. Senn., p. 180, f. 130a. 



Peranema cuneatum. n.sp. (PI. ix., figs. 7 — 9). 



Long. 25—70. lat. ,5— 1.5;x. Auburn (139, 140); Botanic (Jardens (156); 

 Parramatta (132) ; Lismore (187). 



I 



