636 ME. W. JOSHUA ON BURMESE DESMIDIE5!. 



valde elongatis : isthmo nonnihil elongato. Longit. 28 fi, latit. 

 40 fi, crassit. 45 p : isthmi latit. 10 p. 



Cells three times as wide as long, on each side slightly convex, 

 connecting isthmus rather elongated. Cells rather irregular in 

 shape, in end view three-lobed ; base of lobes much elongated. 

 Length 28 fi ; width 40 /u ; thickness 45 f i ; width of isthmus 

 lO/i. 



S. eiliforme, JEhrenb. 



SpHjEkozosma sp. ? Probably new. 



S. excavatum, Balfs. 



S. excavatum, /3. Walltchi, Jacobs. 



5. Gonatozygon, De Bary. 

 G. aspebum, Breb. 



6. MlCEASTEEIAS, Aff. 



M. mahabuleshwabensis, Hobson. Very fine ; abundant. 



M. tbuncata, Cor da, v. c ben at a. 



M. eotata, Qrev. 



M. pinnatitida, Kutz. 



M. teopica, Nordst. 



M. apiculata, Menegh. n.f. (Plate XXII. fig. 13.) 



Jf.prominentiis centralibus in quavis semicellula spinis robustis 

 circumdatis. 



A variety with central protuberances in each semicell circled 

 with strong spines. 



M. cbux-melitensis (Mrenb.), Balfs, var. : see Delponte, 

 pi. iv. 7, 12. (Plate XXII. figs. 10 & 11.) 



M. alata, Wallich (I. c. p. 279, pi. xiii. fig. 11). Entirely 

 identical with the Bengal species, and abundant. 



M. incisa, Kutz., var /3. Wallich. 



M. foliacea, Bailey. 



M. lux, n. sp. (Plate XXII. fig. 12.) 



M. magna, orbicularis, laevis : semicellulis distincte 4-lobatiB, 

 lobis subdivisis, valde attenuatis, basi leviter inflatis, apicibus 

 profunde furcatis, radios rectos sistentibus : lobis terminalibus 

 anguste cuneatis, divergentibus, attenuatis. Longit. (s> ne 



