BY G. I. PLAYPAIR. 319 



Pen. cucurbitinum var. subpolymorphum f. crassior, n.f. 



Forma paullo major quara forma typica, prse longitudine paullo 

 latior; apicibus rotundatis nee subtruncatis. 



Long. 25, lat. 50 /x. 



Lismore(185). 



A form somewhat larger and slightly broader than Nordstedt's 

 type, Frw. Alg. N.Z,, p.71, P1.7, f.20. For a length of 95 /x, his 

 figure gives a breadth of 42J/x, which agrees with specimens 

 gathered by Liitkemiiller in Austria (Desm. d. Attersees, p. 8). 

 The latter gives long. 96-100, lat. 40-42, lat. constr. 36 /x. In 

 the very slight constriction, however, our form resembles the 

 type. (PI. xli., f.6.) 



Genus Closterium Nitzsch. 

 Closterium Spetsbergense var. palustre, n.var. (PI. xli., f.7.) 



Forma gracilior, juxta polos acutior; latere dorsali piano psene 

 usque ad polos, quam levissime recurvato in extremis; latere 

 ventrali arcuato polos versus psene recto ; apicibus truncatis 

 incrassatis; membrana hyalina, glabra, punctis nullis nee striis. 



Long. 275, lat. 34, ap. 7-8 /y. 



Lismore(185). 



Cf. CI. Spetsbergense Borge, Siissw. Alg. Spets., p. 8, fig.5, of 

 which the author remarks that a very closely connected form is 

 CI. lanceolaturti /S coloratum (Klebs) Playf., Some Syd. Desm., 

 p.604 Pl.xi., f.l. From the figures in W. k G. S. West, Brit.^ 

 Desm., i., however, it is evident that the latter is not CI. lunula 

 p coloratum Klebs, which it was supposed to represent. It might 

 stand, therefore, as CL Spetzhergense var. australe milii. For the 

 type, Borge gives : Crass, cell. 40-46 /x, crass, apic. 6-7 /x, crassi- 

 tudine 5-6-5-plo longius. The Sydney specimen figured. I.e., 

 measured 270x45, ap. 7-8 /x. Cf. CI. lanceolatum Kutz.(?) in 

 Cleve, Sveriges Sottv. Alg., T. iv, f.7. 



Closterium acerosum var. Casinoense Playf. 



Long. 440, lat. 40/x. Membrana dilute luteola, obscure striata. 



Lismore(248). 



Cf. Biol. Richm. River, these Proceedings, 1914, p.lOl, PI. iii., 

 f.5. 



