136 AUSTRALIAX FRESHWATER FLAGELLATES, 



This form retains its sliapc well and is not at all like Tr. gihberosa. T 

 erect it here as a separate tyjie. Specimens a little laiuer than those from Par- 

 ramatta; a new record for the species. 



Trachelojioxas laxceolata, n.s]i. (PL vii.. fi<;s. lil. 2ii). 



Lorica laneeolata. laterihus rotundatis; sursum collo quadrato; inferne 

 sensim sensinuiue attenuala. aeumiiiata: a latere iutenlLim eompressa. Membrauu 

 glabra. 



Lons;-. 30, lat. 12—13; coll. alt. 4, lat. 5— 6/x. Parramatta (136): Lismore 

 (258). 



Lanceolate with rounded sides, above converging to the wide square neck, 

 below gradually running down to a point; membrane smooth. The Parramatia 

 specimen was slightly compressed in side view. 



Trachelomoxas spiralis, n.sp. (PL vii., fig. 21). 



Lorica elliptica, inferne acuminata, lateribus aequaliter arcuatis, sursum 

 collo, lato, humili instructa. Membrana hyalina glabra, teuuissima, torta; costis 

 spiralibus 3 — 4 ornatis. 



Long. 36, lat. 21; coll. alt. 3. lat. 6^. Botany (151). 



Lorica elliptic, pointed below, sides evenly arched, neck wide and low ; 

 membrane very thin, hyaline and with the delicate matt or frosted surface 

 common in this class of Trachelomonas. It belongs to the stipitate group, though 

 it has no tail. Three or four ridges run spirally from end to end, the lorica 

 having probably been an adherent form which has got twisted in growth. The 

 tail itself in these forms is due to twisting, as a close examination will often 

 show. 



Fam. ASTASIACEAE. 



Genus M e x o i n i u m Perty. 



Menoidium pellucidum Perty. (PL viii., fig. 1). 



Long. 40—50, lat. 12—16, ap. 3;u,. Rookwood; Lismore (285, 350). 



Menoididm iNFLATtiM mihi. (PI. viii., tig. 2). 



Forma plana, levissime arcuata. fronte et postice acuta; rostro niinuto 

 angustissimo; cytoplasmate plerumque homogeneo, granulis amylaeeis millis. 



Long. 50— 63, lat. 10— 12ja. Coogee; Botany (92); Guildford (60); Sydney 

 Water Supply. 



Syn. M. pellucidum var. inflatuni Playf.. Flankt. Sydney AVater, p. 547. 

 More common round Sydney than any otiier species, not noted yet at Lismore. It 

 is flat like a i>ieee of card, acutely pointed at each end, under side nearly flat, 

 upper arched but not always as much as figured. Rostrum reduced to a mere 

 spine, but trom Stein's figures it seems likely that this is only the lower edge of 

 the rostrum, the upper edge growing out of tiie body,, a little higher up, later 

 on. Cytoplasm generally homogeneous, without granules. 



Mi;Miniir.M acutissimum, n.sp. (PI. viii., fig. 3). 



Fornui longissima, angustissima ; fronte truncata, baud rostrata; pone longe 

 protracta, acutissima ; latere inferiore fere recto, superiore (luam levissime 

 arcuato; pharynge distincto; stigmato minutissimo; baeillis amylaeeis longis 

 angustis in serie singula dispositis ornata. 



