KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 25. N:0 5. 77 



10. E. ansatum, Focke (Phys. Stud. I, p. 64, t. I, f. 8, 1847; non P]hrb. Lebensd. p. 82, 

 1832; nec Infus. p. 162, t, XII, f. VI, 1838; E. didelta Ralfs in Annals, p. 190 ex p., 

 t. VII, f. 2 c— f, 1844). 



»The sporangiurn is tubereulate», G. C. W. (Beng. Desm. p. 283). 



Near Mungulpore, 21 Oct. 1855 (W. Mscr. No. 200 c. icone); Zellbr et Rabil, 

 Arracan, 1873; Khasia, corara. G. v. L., 1889. 



Concerning the zygospore, the above is noted from Wallich, 1. c. p. 283. The 

 icon, however, given in his Mscr. No. 200 (' E. didelta?') is in outline exactly like 

 /V suprapositid Nordst. (Desm. N. Z. p. 33, t. 3, f. 4), but as it internally difters 

 therefroni I propose to name it: 



— — / supposita, n. v. Semicellulae lobis basalibus sinuosis, tunioribus binis 

 supra isthniuni horizontaliter ordinatis et insuper tumöre unico ornatae. Long. 78, 

 lat, 42 ,u. 



Witli respect to Dr. Wallich's remark on the zyg. being tubereulate, this con- 

 flicts with Nordstedts observation (Norg. Desm. p. 9) »Zygosporae globosie verrucis 

 obtuse conieis hyalinis obsessae», probably Wallich confused with this the zyg. of 

 the Bucceeding speeies. 



11. E. didelta, (Tdrpin?) Ratjfs (= Heterocarpella didelta? Tubp. Mém. p. 295, f. 16, 1828; 

 Cos. didelta, Mengh. Synops. p. 219, 1840; Eu. didelta, Ralfs ex. p. in Annals t, VII, 

 f. 2 a, b, 1844; Focke Phys. Stud. p. 64, t. I, f. 9, 1847; Cos. fenestratum Corda» 

 Alm. t. V, f. 29, 1839). 



Long. 130, lat. 65, diam. zyg. 77 f< (fide Wallich Mscr. No. 190 as. Eu. an- 

 satum?). W. Desm. Beng. p. 283. 



T. XI, f. 7 (zygospore only, after G. C. W., Mscr. 1. c). 



\\ AELicii s descr. in D. Beng. 1. c. does not accord with the figure in Mscr. which, 

 on after consideration I am disposed to think is novel. It may be described as />' 

 Ben^alicum, Lagerh. (Desm. lieng. p. 6, t, I, f. 3) forma simples, n. f. Lateralibus 

 vix sinuosis; semicellulae basi dilatatse, supra incavata'; sinu lineari brevi, subito ampli- 

 ato; angulis basalibus acuto-rotundatis; tumoribus basalibus tribus örnatum. 



The outline is almost like E. ansatum, the basal portion being dilated, and some- 

 what acutc at the dilated extremity of the side. »The sporangiurn ... is tubereulate», 

 G. C. W. p. 283. As Tlhpin's form is rather a Cosmarium, this speeies ought to 

 rank as Euastrum fenestratum, Corda. 



12. E. humerosum, Ralfs (Br. Desm. p. 82, t. XIII, f. 2, 1848). 



G. C. \V., Desm. Beng. p. 283. 



13. E. afflne, Ralfs (in Annals N. H., vol. XIV, p, 191, t. VII, f. 3, 1844). 



Dr. Wallich is evidently of opinion that this and the preceding are closely re- 

 lated, as he savs (p. 283 1. c-.) the transverse views of these two forms inerge one 

 into the other»; to which I would add that the lateral views do not agree in form, 

 and consequently separate thein. 



14. E. gemniatam, Bréb. (Cosm. gemmatum, Bréb. in Mengh. Synops. p. 221, 1840; Eu. 

 gemmatitm, lvrz. Phye. Grerm. p. 134, 1H45; Eucosmium Hassalianum,^ÄG.FÅT)z.'A]g. 

 p. 121, t. VII b, 1849). 



