610 SOME SYDNEY DESM IDS, 



(Borge) mihi ( = Eu. spinidosum var. ornatum Borge, in Bail. 

 Bot. Bull. xv. T.13, f.13; (6) var. perornatum mihi, the fully 

 developed form. Cf. also Eu. divergens Josh , Burm. Desm. T.23 r 

 £.8,9, 



Eu. turgidum Wall. var. Moebii mihi. 



Eu. verrucosum forma, Mobius, Austral. Siissw. ii. T.2, £.21; = 

 Micr. Mobii West & West., Desm. Singapore, p.162; = Eu. verru- 

 cosum Ehr., var. Mobii Borge, Austral. Suss. Chlor. T.2, f. 18, 19. 



Endochroma in laminas parietales 4 ordinata. Nuclei amylacei 

 8 in quaque semicellula ad bases processuum positi. 



Long. 110-150; lat. 108-120; lat. lob. pol. 72-102; lat. coll. 60-72; 

 lat. isth. 40-48; crass. 66-84/x. 



Auburn (56, 59, 67), Guildford, Fairfield. 



In ' Desmids from Singapore,' 1894, West & G. S. West 

 described and figured a plant to which chey gave the name Micr. 

 Mobii var. Ridleyi, considering it a variation of Micr. Mobii 

 West & West ( = Eu. verrucosum Mob., supra). It seems to me 

 certain that, whether a Micrasterias or a Euastrum, their plant 

 is specifically identical with Eu. turgidum Wall., in Turn. Alg. 

 E. Ind. T. 10, f.28; and with Eu. turgidum {verrucosum) var. 

 crux australis Rac, in Desm. Ciast. T.2, £.26. This connection, 

 the following considerations will, I think, show. Compare West 

 & West, f.2b, with Turner, f.28c, and Rac. f.26c, right figure; and 

 West & West, f.2e, with Turner, f.28b. 



The slight dissimilarity in front-view is not sufficient to make 

 up for the decided agreement in end-view. It is true that 

 Turner's figures would perhaps make Eu. turgidum verrucose, 

 but the difference between verrucose and scrobiculate membranes 

 has not always been noticed. Raciborski's figures also are not 

 above reproach, both front-views being evidently tilted; but the 

 likeness to Eu. turgidum is quite recognisable, and is indeed 

 commented on in the text. Without doubt his plant and that 

 from Singapore should at least be Eu. turgidum Wall., var. crux 

 australis (Rac.) and Eu. turgidum Wall , var. Ridleyi (West k 

 West), respectively, even if var. Ridleyi be not regarded as a form 



