138 ' AUSTRALIAN yRLSHWATKR FLAGELLATES, 



Genus A s t a s i a Dujardiii. 

 Astasia margaritifera Schmarda. (PI. viii.. tig. 9). 



I am doubtful about the identification of this inlusoiian, having never 

 observed it in the tree-swimiuing form figured by Senn, I.e., p. 177, f. 128a. (Inly 

 when travellinj,' with its eharacteri.stic uietabolie movement does it draw one's 

 attention, and so I represent it here. The fiagellum is very often (generally?) 

 wanting; cytopla.sm granulate. On one occasion half a dozen individuals were 

 found living parasitically within the tissues of a living specimen of the Tur- 

 bellaria: they were devoid of a fiagelluin and worked themselves to and fro 

 with their usual metabolic progression. 



Long. c. 20— 50;it. Auburn (139) ; Pott's Hill (121); Lisraore (312). 



Genus S p n E X o M n a s Stein. 

 Sphenomonas QrAUHANfiULAiiis var. CRUCiFORMis, n.var. (PI. viii., tig. 10). 



Ovate, pointed in front; with four, more or less elevated, longitudinal 

 ridges each containing at the summit a series ol' granular nuirkings. The 

 European form (type) is rbomboidal in outline, witli lounded lateral angles; 

 in end view almost s(]uare. witli slightly cuspidate sides and sharp angles. Oui-s 

 are cruciform with deeply excavated sides and rounded tips to the arms. Kare. 

 For the type see Stein, T. xxiii., f. 49—53; Kent, T. xxiv.. f. 21—23. 



Long. 24—27. lat. 10- 13ju. Rookwood (107); Lismore (297, 345. .347). 



Sphenomonas australis, n.sp. (PL viii., tig. 11). 



Cellnlae pyriformes. sursmn attenuatae. subacutae; interne rotundatae; 

 lateribus arcuatis; rugis (i (visis 4) granulatis per lon_gitu<linem dispositis ornata. 

 Vertice visae hexagonae lateribus emarginatis. 



Long. 25—26, lat. 10—12^. Rookwood; Botanic Gardens. Sydney (15(i); 

 Lismore (312). 



This species is more frequently met with here than any other of the genus. 

 It is drop-shaped, narrowed and subacute in front, rounded behind. End view 

 hexagonal, as the body is ornate with longitudinal granulate ridges. The 

 hinder part of the body is generally a solid ball of some perfectly transparent 

 highly refringent substance (leucosin ? or paramyluni ?). So homogeneous 

 and pellucid is it that the granules on the under side can be seen, magnified, 

 through it. 



Var. klliptica, n.var. (PI. viii., fig. 12). 



Cellnlae longe-ovatae, paene ellipticae, I'ronte ncuniinatae, postice rotun- 

 datae, lateribus Icvissime arcuatis. Dimensiones ut in f. typica. Rookwood 

 (107). 



A much less common elliptic form of similar size and characteristics to the 

 type. 



Var. RTiojiDOJDBA, n.var. (Fl. viii., tig. 13). 



Cellnlae rhomboideae, lateribus angulatis, utro(|uc polo acuniinatac. 



Long. ad. 30, lat. l(y. Guildford (45). 



The cells are rhomboidal, sides angled, ends sut)acutcly rounded. 



