BY G. I. PLAYFAIR. 15 



which it is connected by var, intermedia. All three are stages 

 of development. 



Var. AUSTRALis, n.var. (PL ii., fig.-). 



Lorica levis, subovata, postice latior, collo quadrato valido 

 semper instructa; parte majore corporis suboblonga, fronte usque 

 ad collum attenuata, a tergo latissime-rotundata; collo ad basin 

 annulo incrassato plerumque ornato. 



Long. 34-38, lat. 16-20; coll. alt. 4, lat. 4 /x. 



Botany, 108, 142, 152; Lismore 225, 240, 241. 



This is the full-grown form of Track. Volzii, and a very distinct 

 type; the colour is generally a clear yellow. 

 Var. INTERMEDIA, n.var. (PI. ii., f.3). 



Lorica in ambitu ut in var. australi sed angustior, collo autem 

 ad formam typicam potius pertinente. 



Long. 34; lat. fronte 11, postice 15; coll. alt. 3, lat. 3 fx. 



Botany 142. Cum forma typica. 



I had var. australis down as a separate type (it is much more 

 common than the other two forms) when I came across Tr. Volzii 

 and this variation, both in the same gathering, showing unmis- 

 takably the connection of all three. Var. intermedia has the 

 thin outer primordial membrane of the lorica stretched between 

 the shoulder and the tip of the neck as in Tr, Volzii, type. 

 Var. CYLiNDRACEA, n.var. (PI. ii., f.21). 



Lorica modice cylindracea, lateribus parallelis; a tergo late- 

 rotundata; a fronte conica, lateribus ad collum convergentibus; 

 collo recto valido, annulo basali ornato, instructa: membrana 

 levis. 



Long. 34-38, lat. 16; coll. alt. 4-5, lat. 4 /x. 



Centennial Park 133; Botany 152. 



This form has not, so far, been noted at Lismore, but it is 

 almost certain to turn up eventually. It lies between var. inter- 

 media and var. australis. The latter is broader and more ovate. 



Trachelomonas EUCHLORA(Ehr.) Lemm., forma. (PI. iii., f.l). 

 Lorica ovalis vel oblonga, semper autem minus rectangularis 

 quam forma typica. 



Long. 29-30, lat. 19-20; coll. alt. 5, lat. 4/x. 



