io 38 
warts. Moreover, some of these warts or verrucæ are arranged right across (lie front of 
the semicell, a disposition of markings which is never observed in any form of C. ornci- 
tnm. C. jloriferum might also be compared with the various forms of C. ordinatum 
(Bôrgesen ) W. and G. S. West. 
212. Cosmarium globosum Bulnh. — Cundinamarca : n° 24. 
21 3 . Cosmarium humile (Gay) Nordst. — Antioquia : n° 6. 
2 1 4 • Cosmarium impressulum Elfv. — Antioquia : n oS 1, 2 and 5 . Cundimarca : 
11° 23 . 
2 1 5 . Cosmarium læve Rabenh. — Cundinamarca: n° 14. 
216. Cosmarium Lundellii Df.lp. — Cundinamarca : n° 32 . Long. 77 p ; lat. 58 - 
62 p ; lat. isth. 21 p.. 
217. Cosmarium Mayori sp. now. 
C. subparvum, tam longum quam latum, profunde constrictum, sinu angusto-lineari 
extremo leviter ampliato ; semicellulæ transverse oblongo-trapeziformes, apice subrecto 
et glabro, lateribus leviter convexis, verruca conica prope sed supra angulum inferiorem 
unumquemque, et verruca conica singula in medio marginis lateralis uniuscujusque, angu- 
lis superioribus minutissime productis et acutis, cum sérié singula verrucarum rotundata- 
rum 6 juxta sed infra apicem, et seriebus subcurvatis duobus granulorum trans medium 
semicellulæ ; scrobiculis minulis inter granula ; a vertice visæ ellipticæ, polis verruca 
conica singula instructis, sérié verrucarum rotundatarum 6 juxta sed intra marginem late- 
ralem unumquemque ; semicellulæ a latere visæ obovatæ, apice leviter convexo, parte supe- 
riori marginis lateralis uniuscujusque triverrucosa. Pyrenoidibus binis. 
Long. 37-38 p. ; lat. 36-37 p; lat. isthm. 10-11 p; crass. 22-24 p- (PL XXIII, fig. 67). 
Cundinamarca : Laguna de LTbaque, Estern Andes ; altit. 2066 m. N° 23 . 
This species was rather infrequent among large numbers of C. Quadrum. Its 
characters are. so distinctive that it is not necessary to compare it closely with any other. 
218. Cosmarium minimum W. and G. S. West. — Antioquia : n° 5 . Long. 9-9,6 p.; 
lat. 8 - 8,5 p ; lat. isthm. 3 , 5-4 p- ; crass. 5 - 5,3 p. (PL XXII, fig. 62). 
219. Cosmarium moniliforme (Turp.) Ralfs. — Antioquia : n os 5 and 10. 
220. Cosmarium nitidulum De Not. forma minima. 
Forma cellulis multe minoribus, profundissime constrictis. 
Long. i 3 p. ; lat. 10 p. ; lat. isthm. 1,8 p ; crass. 6,5 p.. 
Antioquia : n° 5 . 
221. Cosmarium obtusatum Schmidle. — Antioquia : n° 5 . 
Only one specimen was observed and it was decidedly smaller lhan the average for 
this species. Long. 46 p. ; lat. 4 o p ; lat. isthm. 1 2-5 p. 
222. Cosmarium ornatum Ralfs. — Cundinamarca : n° 24. 
223 . Cosmarium propinquum sp. nov. 
C. parvum, circiter 2 1 / 3 -plo longius quam latum, subprofunde constrictum, sinu 
lineari extremo ampliato ; semicellulæ longitudinaliler oblongo-rectangulares, angulis 
