176 SOME NEW OR LESS KNOWN DESMIDS FOUND IN N. S. WALES, 



Exact shape of En. circuJare in Ralfs, T. 13, £.5*^/, but a little 

 broader across the middle sinuatioii, making the basal portion 

 more quadrate. Not much like We-t's fig, (I.e.) but the scrobi- 

 culae are there. West gives the size 70 x ;)2^. 



Eu. CAMPANULATUM, n..»p. (T.iii. f.l6). 



Eu. mediocre, medio sinu lineari constrictum, diametro circ. 

 subduplo iongius. Semicellulae trilobntae, campanulatae, suj ra 

 bnsin ventricosae, sursum in collum curtum repente constrictae; 

 aiigulis inferioribus obtusis; lateribus in parte inferiore convexis 

 inflationibus levibus singulis, in parte superiore (coUo) concavis; 

 lobo polari paullulo inflato; angulis superioribus rotund atis; 

 apicibus truncatis; incisura lineari. Semicellulae tumoribus 3 

 basalibus et supra 2 in serie horizontali cum inflationibus latei- 

 alibus ordinatis, praeditae; inter tumoies scrobiculis 3. A latere 

 visae elliptico-ovatae, ad apices attenuatae, basi rotundato- 

 truncatae. Membrana subtilissime punctata. 



Long. cell. 92, 93, 93, 96, 97; lat. cell. 52, 42, 48, 44, 41; lat. ap. 

 24, 18, 20, 19, 19; lat. coll. 22, 17, 18, 17, 18; crass. 33, 24, 30, 22, 

 24^. 



Collector, Botany, Centennial Park. 



This species comes to maturity in three stages, all of which are 

 commonly found accompanying one another. The immature 

 forms ver}^ much resemble Eu. ansatum in outline, and indeed 

 that is the case with several other species of Euastrum. In T.iii., 

 figs. 14, 15, 16 show the mature and the two young forms, all 

 found in the same water. Other transition forms were noticed, 

 and sometimes fronds formed of two different semicells. It is the 

 connecting link between the siniiosum and lorigicolle groups of 

 Euastrum. 



Forma immatuia No.l. (T.iii. f. 14). 

 Forma ad Eu. ansatum accedens basi autem latiore, curtior 

 quam forma typica, aegre ventricosa; lateribus sine tumoribus 

 lateralibus; collo non producto; lobo polari non inflato; scrobicula 

 una tantum. 



