194 SOME NEW OR LESS KNOWN DESMIDS FOUND IN N. S. WALfilS, 



serie horizontali paullulo arcuato ordiiiabis, ornatae. A vertice 

 visae ellipticae graiiulis gemiiiatis ubriiique instrucbae. Mem- 

 brana minube puncbaba. 



Long. 22-24; lab. 22-25; crass. 12-15/.. 



Murray's Lagoon, Collecbor. 



GtC OS. pseudofaxicliondrum Nord. var. Africcnu(m^e^t,Jo\x\\\. 

 Bob. XXXV., T.367, f.l4; and C. heterochondrum Nord., De Alg. 

 Babav. T.l, f.3. 



Cos. viCENiSTRiATUM, n.sp. (T.v. f.l6). 



Cos. parvum, subquadrabum, circa bam longum quam labum, 

 medio sinu lineari profunde consbricbum. Semicellulae subreni- 

 formes, basi labo, piano; dorso bruncabae, angulis inferioribus 

 obtusis; laberibus labe robundabis; angulis superioribus obbusis; 

 granulis circa 20 in seriebus radianbibus uljique brans marginem 

 ordinabis ornabae; granulis 2-3 inbra marginem; supra isbhmum 

 leviter inflabae. A verbice visae ellipbicae, in medio ubrinque 

 inflabae, apicibus labe robundabis. Nuclei amylacei singuli. 



Long. 21-27: lab. 18-27; crass. 15;^.. 



Rose's Lagoon, Collecbor; Bobany. 



Young forms have blie sides of bhe semicells converging bo bhe 

 broad bruncabe apex, nob broadly rounded, and fewer lines of 

 granules across the mai-gin. Cf. G. striatum and C. jenisejense 

 Boldb., Sibil-. Chlor. T.5, f.9 and 13; also C. polonicum Rac. var. 

 alpinum Schm., Alp. Alg. T. 15, f.21. 



Cos. FLUVIATILB, n.sp. (T.V. f. 18). 



Cos. parvum, subov^ale, paullo longius quam labuni, medio sinu 

 lineari exbremo ampliabo profunde consbricbum. Semicellulae 

 subreniformes a basi labo ad apicem abbenuabae; angulis inferi- 

 oribus obbusis; laberibus leviber convexis convergenbibus sub 

 apicem paullo rebusis; apicibus angusbis, bruncabis; granulis 

 obscuris in seriebus 3 brans margines laberales ordinabis, granulis 

 inbra marginem 2; supra isbhmum granulis validioribus geminatis 

 ornabae. A verbice visae ellipbicae ubrinque in medio granulis 

 geminabis praedibae; apicibus obbusis, granulis in seriebus 3-4 

 bransversalibus ornabis. Membrana subbilissirae puncbaba. 



