BY G. I. PLAYFAIR. 23 



Long., collo incl., 32-45, lat 22-26, s. sp.; sp. long, ad 4 /x, vulgo 

 2 It; coll. alt. 1-3, lat. 6-10 /x. 



Auburn 57, 119, 140, 148, 149, 163; Guildford 45, 114, 146; 

 Botany 92, 145; Canley Vale 110; Centennial Park 133; Botanic 

 Gardens 137; Lismore 225, 241, 245, 254. 



Common and widespread; quite distinct from Tr. hispida, and 

 easily distinguished from it under the microscope. The lorica is 

 elliptic or long-oval, sometimes slightly flattened at the sides, 

 whereas Tr. hispida (here at any rate) is nearly always oblong or 

 oval-oblong. Its colour is characteristic also, being generally a 

 pale straw-colour, the membrane thin and transparent. :7V. 

 hispida is nearly always dark yellow or red, the membrane in- 

 crassate. The spines in T?-. Sydneyensis are sharp-pointed but 

 very sparsely distributed, so that they do not show at the margin 

 the "continuous border of spines" characteristic of Tr. hispida. 

 Moreover, the spines, as a rule (almost invariably), are nothing 

 more than mere denticulations not above 2 jx long, and reduced 

 towards the centre; out of 20 records, I have only one with 

 longer spines. The neck is a low band, broader above, with a 

 crenate or spicate margin, and is nearly always present; in Tr. 

 hispida, it is consistently wanting; I have onl}' one record in 28 

 of a collar (2 x 5 /x) in that species. The spines are occasionally 

 bacillar in character, in which case the denticulations are repre- 

 sented by minute granules. 



Var. OBLONGA, n.var. (PI. iv., f.l7). 



Lorica oblonga ubique rotundata, cetera ut in forma typica. 



Long. 46-48, lat. 34-36 /x, sine spinis. 



Botany 151; Kyogle 218, 219. 



Yar. MINIMA, n.var. (PI. iv., f.lS). 



Lorica minor, late-ovalis vel subglobosa, cetera ut in forma 

 typica. 



Long. 26-28, lat. 21-24, sine spinis; coll. lat. 4/x. 



Auburn 135, 140; Botany 151. 

 Var. OBESA, n.var. (PI. iv., f.l9). 



Lorica exacte late-ovalis, prse longitudine latior quam in f. 

 typica, fronte et a tergo spinis minutis acutis sparsis vestita, in 



