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



Eu. CUNEATUM Jenii. ,3 SOLUM Nord., Alg. N. Z , p.34, T.3, f.6. 



Long. 102-110; lat. 36-38; lat. ap. 18-21; crass. 23-27/i. 



Botany. 



Some specimens observed diflfer slightly from Nordstedt's in 

 side view, the lower ))art being semicircular, protruding a little 

 and apparently incrassate. The appearance of incrassation, 

 however, is caused by the folding of the membrane above the 

 isthmus. The basal inflation is hardly visible on rolling over, 

 and not at all otherwise. 



Eu. CUN'HUTUM Jenn. y basiventricosum, n.var. (T iii. f 11). 



8upra isthmum ventricosuui, tumoribus nullis; a latere visae 

 semicellulae conicae, apicibus rotundatis, basi piano, angulis 

 brisalibus rectis. Membrana punctata, punctis in lineas longi- 

 tudinales interdum ordinatis. Cetera ut in forma typica. 



Long. 106; lat. 42; lat. ap. 21; crass. 27/^t. 



Murray's Lagoon, Collector. 



A vertice semicellulam non vidi, fortasse undulationibus 4 

 cruciatim dispositis ut in Eu. ansatuin Ehr. 



It is difficult to find out what the forma tj'^pica is in this species. 

 Ralfs, in Brit. Desm. p. 90, says, "I have not detected any inflated 

 protuberances;" yet in T.33, f.3, he gives an end view showing 

 at least three tumours. Cooke, in Brit. Desm. p. 70, observes 

 "empty frond without inflations," and in T.34, f.6, figures an 

 end view differing from Ralfs' but still with three inflations. 

 Lundell, in Desm. Suec, refers to Ralfs without comment. Raci- 

 borkski, however, in Desm. Nowe, p. 30, notes the "semicellulae 

 e basi visae late ellipticae, lateribus (4 undulatis) tumoribus 3 

 humillimis, vix visibilibus praeditae." Of ail the forms I have 

 observed, the one described below is the only one that had any 

 tumours at all, and that had five, three basal and two above; and 

 all, as Raciborski says, " very low, scarcely visible." 



Eu. CUNEATUM Jenn. b conicum, n.var. (T.iii. f. 12). 



Gracilius quam forma typica, 3plo. plusve longius quam latum. 

 Semicellulae magis attenuatae, angulis inferioribus superiori- 



