— io38 — 



warts. Morcover, some of llu'se \\ai'ts or verriicii' arc arran^cil riglit arross llic IVoiil of 

 the seinicoll, a disposilioii oC inarkings \\liicl» is uever ol)served iii aiiy l'orrii of C. orna- 

 tii/n. C. Jloriferiim miglit aiso be comparcd with (lie varions l'orms of C. orc/inntiim 

 (BôRGESEN ) W. and G. S. ^^ kst. 



ai a. Cosmarium globosum Bulnii. — Cundinanuirca : n" a/|. 



ai!:'). Cosmarium hiimile (Gay) Nordst. — Antiniiiiia : ii" 6. 



ai'|. Cosmarium impressulum Elfv. — ArUio(|iiia : ii"* i, a and 5. Ciindirnarca : 

 11" aiî. 



ai.'i. Cosmarium lœve IIauknii. — Ciiiidinamarca : n" i/j. 



aili. Cosmarium Lundellii Drli". — (aindinamarca : n° 3a. Long-. 77 [j. ; lai. 58- 

 6a a ; lai. islli. ai a. 



a 17. Cosmarium Mayori sp. nov. 



C. snl)par\um, lain longum qnam latiini, profunde conslriclum, sinii anguslo-liiicnri 

 e.x'tremo leviler amplialo ; semicellula? transverse oblons^o-trapezifonnes, apice subrecio 

 et glabro, laleribus leviler convexis, verruca conica prope sed supra angiiluin inferiorem 

 unumquemque, et verruca conica singuia in medio niarginis lateralis uniuscujusque, angu- 

 lis superioribus minutissime productis et aculis, cum série singuia vorrucarum rotuiidala- 

 rum 6 juxla sed infra apicem, et seriebus subnurvatis duobus granulorum trans niediuni 

 semicellula" ; scrobiculis minutis inter granula ; a vertice visœ elliptica', polis verruca 

 conica singuia instructis, série verrucarum rolundatarum 6 juxta sed inlra marginem late- 

 ralem ununiqiiemque ; semicellula; a latere visœ obovalie, apice leviter convexo, parle supe- 

 riori niarginis lateralis uniuscujusque triverrucosa. Pyrenoidibus biiiis. 



Long. 87-38 (.;. ; lat. 36-87 p.; lat. isthm. lo-ii jj. ; crass. 32-24 y-- (PI- XXIII, fig. 67). 



Cundinaninrca : Laguua de Ubaque, Estern Andes ; altil. 2066 m. N" a8. 



Tliis species was ralher infrequent among large numbers of C. Ouadrain. Its 

 characlers are so distinctive tbat it is not necessary to compare il closely vvilh any ollier. 



218. Cosmarium minimum W. and G. S. West. — Antioquia : n" 5. Long. 9-9,0 \j.; 

 lai. 8-8,5 p. ; lat. isllim. 8,5-4 1^- ; crass. 5-5,3 [j.. (PI. XXII, fig. 52). 



219. Cosmarium moniliforme (Tunp.) Ralfs. — Antioquia : n°* 5 and 10. 



220. Cosmarium nitidulum De Not. forma minima. 

 Forma cellulis innlte niiiioribus, profuiidissime constrictis. 

 Long. i3 ]j. ; lat. 10 p. ; lat. istlim. 1,8 p- ; crass. 6,5 [j.. 

 Antioquia : n" 5. 



221. Cosmarium obtusatum Sgumidle. — Antioquia : n" 5. 



Only one spécimen was observed and it was decidedly smaller than llic avcragc for 

 tliis species. Long. 46 [j.; lat. [\o p. ; lat. isthm. i2-5 u.. 



222. Cosmarium ornatum Ralfs. — riundinaniarca : n° 24. 

 228. Cosmarium propinquum sp. nov. 



G. parvum, circiter 2 '/y-plo longius quani latum, subprofiinde conslriclum, sinu 

 lineari extremo amplialo ; semicellula' longiludinaliter oblongo-rectangulares, angniis 



