66 SOME RECENTLY PUBLISHED DESMIDIEjE. 



In the same paper (taf. iii. f. 16-18) he figures what he considers 

 to be Coswariwn pseuduprotuherans Kirchn., but none of his figures 

 represent this species; they are nearer C. ellipsoideiun Elfv. (or 

 fig. 16 to C. contractum Kirchn,). 



Closterium robustum Hastings (New Desmids from New Hamp- 

 shire, Amer. Monthly Micr. Journal, July, 1892, p. 154, pi. i. f. 4). 

 This is but a form of Closterium Ehrcnhergu Menegh., and is not 

 very well figured. 



Penium Lewisii Turn. (Desmid Notes in Naturalist, Nov. 1893, 

 p. 346, fig. 15). This is but a large form of Penium exiijtnim West 

 {Freshw. Ah/, of W. Ireland, p. 126, pi. xix. figs. 17, 18), differing 

 from it only in size, and may hence be called Penium exijjuum West, 

 forma Lewisii. 



Penium navigium Turn. [Freshw. Ahj. of E. India, p. 17, t. i. 

 f. 9). It is a difficult matter to see the difference between this and 

 some forms of Penium digitus Breb. In gatherings from many 

 places in W. Ireland (and also in N.E. Ireland) we have examined 

 large quantities of Penuim digitus; some of these were almost pure 

 gatherings of it. Forms like P. navigium Turn, and P. lamellosum 

 Breb. were most abundant, amongst them being smaller and larger 

 forms like those in Ealfs' Brit. Desm. t. xxv. f. 3, and we cannot 

 but come to the conclusion that these "species" are forms of one 

 and the same species. 



Cylindrocystis ovalis Turn. (Freshw. Alg. of F. India, p. 16, t. i. 

 f. 5). From the perfectly elliptical form, and smooth thick mem- 

 brane, this appears to us to be a species of Oocgstis. 



Micrasterias Kitchelii Wolle, forma polonica Eichler & Gutw. 

 (Nonn. Alg. Nov., Kralww Akad. 1894, p. 12, t. v. f. 41). This is 

 much smaller and far too different in form to belong to Micrasterias 

 Kitchelii Wolle, which is itself but a variety of Micrasterias de- 

 pauperata Nordst. The lateral and vertical views are neither 

 described nor figured by Eichler and Gutwinski. It is of such 

 a marked form that it should be placed as a proper species, under 

 the name of M. polonica, u. sp. Compare with Fucosntium Kiit- 

 zingianiun Reinsch (Algenji. von Frank, p. 123, taf. viii. f. iii.). 



EuASTRUM vERRucosuM Ehmb. var. Crux-australis Eacib. 

 (Des)uidga. iv podrozy na okolo ziemi, Krakow, 1892, p. 18, tab. vii. 

 f. 26). This is a form of Eiiastrum turgidum Wallich, but the 

 figures given by Raciborski are not sufficiently good to determine 

 whether it is a variety of it or not. Fig. 26c sinistra and fig. 26 c 

 dextra are somewhat at variance with each other, and the two 

 figures of the front view (fig. 26(() are somewhat tilted. It is not 

 quite clear, from his figures, whether or not the Australian form 

 has the additional projection above the basal angles. 



EuASTRUM magnificum Wollc, var. crassioides Wolle (Hastings, 

 New Desmids from New Hampshire, i., Amer. Month. Micr. Journ. 

 July, 1892, p. 153, f. la-c). This is merely a form of Euastrum 

 crassum (Breb.) Kiitz., both in frout, lateral, and vertical views, 

 and does not show any relationship to E. inagni/irum. 



Euastrum octangulare Borge (Siisswasser Chlorophy. Arch- 

 angel, Bidrag till K. Sv. Vet-. Akad. Handl., Band 19, Afd. iii. no. 5, 



