24 THE GENUS THACHELOMONAS, 



medio spinis ad deuticulos reductis; collo humillimo ore dentato; 

 membrana translucente dilute luteola. 



Long. 36, lat. 25-26; coll. alt. 2, lat. 7; spin. long, ad 2/x. 



Guildford 45; Lismoie 245. 



A broader oval than the type, with minute spines sparsely 

 distributed at each end, but reduced to denticulations, or entirely 

 wanting, towards the middle. Found in quantity in rainwater 

 pools on grass-land; interspersed were many specimens entirely 

 smooth. 



Trachelomonas armata (Ehr.) Stein. 



Chi. corpore ovato subgloboso, utrinque rotundato, fusco, ubique 

 setis brevibus hispido, corona apiculorum postice nigra. 



The above is Ehrenberg's description of his Chcetotyphla armata; 

 it indicates a broadly ovate lorica covered with short spines, and 

 with a ring of short, somewhat stouter spines behind. Such a 

 form, I have never seen, the nearest to it being var. longispina, 

 infra, which differs from Ehrenberg's description only in the 

 great length of the posterior spines. 



Var. GLABRA, n.var. (Pl.iii., f.l7). 



Lorica oblonga vel ovale-oblonga, perfecte glabra interdum 

 punctata, a tergo corona spinarum validarum ornata, inter 

 coronam interdum paucis spinis minutis. 



Long. Corp. 34-46, lat. 28-34; spin. c. 10-16, long. 2-8 /x. 



Botany 151; Guildford 114; Parramatta 96, 165, 166; Lismore 

 241,242. 



This is Stein's, T. xxii., f.37. Upon f.38, Lemmermann has 

 founded Tr. arynata var. Steinii Lemm., which is smooth, but 

 with small scattered spines at the anterior end, besides the pos- 

 terior ring of larger awns. Cf. Dr. Volz gess. siissw. Alg. p. 16 5, 

 where he gives the size as 29 //- long and 22 /z, broad. This is 

 somewhat smaller than any I have noted. Stein's figures measure 

 37 X 27 ji without spines, corresponding almost exactly to the 

 smallest sizes here. Australian forms are invariably smooth or 

 granulate ; excepting the very rare var. longispina described 

 below, I have never seen a specimen that could be described as 

 hispid. 



