KONGL. SV. VET. AKADEMIENS HANDLINGAR. HAND 25. N:0 5. 79 



20. E.? sp. E.? E. erosum, Lund. ut supra, et Cosm. crenatum, Ralfs (Br. Desmi. p. 96, 



t. XV, f. 7) intermedium! 



('renas speciei posterioris et apiees sp. prioris habet, 



Long. 22, lat. 14, lat. isth. 5 ti. T. X, f. 22. 



Possibly also related to the forms given by Reinsch as C. MenegMnii, formen 

 (Contr. p. 88, t. XII, f. 12 a, b), non c, which is C. MenegMnii, while the others are not. 



21. E. singulare, n. sp. E. minus; eirc. 4-ta parte longius quam latum; indistincte hexa- 

 gonum; semicelluhe sub-pyramidataj ; basi valde inflatae, supra attenuatse; lateribus 

 3 — 4 crenato-undatis, crena basali protrudens, apicem versus incavatis; apicibus rotun- 

 datis, incisura apicali rotundata; sinu lineari, angusto, externe ampliato; membrana 

 glabra. Cum pra^cedente valde congruens. 



Long. 26, lat, 21, lat. isth. 4 ,». T. X, f. 45. 



This peculiar form, like No. 20, seems to combine the characters of two genera. 

 The rotund little protrusions upon the rounded basal angles are very distinctive. 



22. E. orientale, Nob. (E. insigne, Wolle Desm. U. S. A., p. 102, 1884, t, XXVII, f. 39—43?, 

 non Hassall Br. Fr. Alg. (sine descriptione; in contextu et Indiee omissum!) vol. II, 

 p. 21 (nomen solum!), t. XCI, f. 2, 1845; = Eu. gracile, Rlfs. Bot. Soc. Edin., et 

 exsicc, 1844). 



E. mediocre, l 1 2 -plo longius quam latum, trilobatum; lobus polaris valde pro- 

 tentus; apicibus euneate incisis; angulis omnibus rotundatis: semicellula> lageniformes, 

 basi late dilatatae, in basali parte tumoribus duobus omatse; sinu acuto, sub-cuneato, 

 extrorsum valde aperto; membrana dense punctata. A latere visum truncato-laneeo- 

 latum, acute constrictum, ad tumöres basales et angulos apicales acuto-rotundatum. 



Long. 64, lat. 42, lat. isth. 12, crass. 28 ,u. T. X, f. 34; XI, f. 26. 



Wolle's form is very near this, but hardly exactly the same; there is a little 

 difference in the basal or vertical view, the tumid parts being (in that view) more 

 angular than in this plant. Mr. Wolle's form is certainly not E. insigne of Hassall, 

 but his E. mammillosum decidedly is so, but with the basal protuberances dejected 

 and lengthened: the latter might stånd as var. />' mammillosum, Wolle, a form I have 

 seen from Fiskeland in Norway, also termed E. insigne c montanum by RaGIB. in 

 Desm. Polon. p. 36, t. IV, f. 1, 1885. E. orientale is apparently between E. insigne 

 Hassall, 1. c., and E. intermedium, Cleve (Bidr. ]>. 484, t. IV, f. 1); from the latter 

 it differs in the tumours at base, and hence in the läteral view, wbieh is more like 

 the side view of K. intermedium of Wolle 1. c, t. XXIX, f. 1 — 5 (= E. Wollei 

 LaGerh. Bidr. Amer. p. 233), not Gleve's speeies. HoAvever, it is diflSoult to reconcile 

 the words of Cleve »eephymatibus nullis», with the remarks of Lundell, Desm. Suec. 

 ]>. 21 (t. II, f. 4), and it seems probable that the distinguished author of the speeies 

 must have been mistaken. 



\_Note. Réspecting the allied speeies K. insigne, I think that Ralf»' naine of E. 

 gracile has priority, as not only was Ralfs' public description and distribution prior 

 to Hassalls woi-k, but Ralfs (Br. Desm. p. 84) says that Di'. H. actuallv published 

 from his specimens distributed »under the nanie» of E. gracile! This seems to be only 

 a portion of the appropriation so far as the Desmidiea* are eoncerned, for, except the 



