io 36 
201. Cosmarium angulosum Bréb. var. concinnum (Rabenh.) W. and G. S. West. 
— Cundinamarca : n° 2 3 . 
202. Cosmarium antioquiense sp nov 
C. minutissimum, circilcr r J / 6 -plo longius quam latum, modice constriclum, sinu 
valde aperto et rotundato ; isthmo elongalo ; semicellulæ obreniformes, apice concavo et 
glabro, margine rotundato laterali unoquoque (et parte parva apicis) cum granulis con- 
spicuis 4, et intra parlem laleralem unumquemque semicellulæ granulis 4 vel 5 instruc- 
tæ ; cellulæ a latere visæ oblongæ, vix constrictæ, parte superiori semicellulæ granulatæ ; 
a vertice visæ oblongæ, lateribus rectis, polis rotundatis et conspicue granulatis. 
Long. i 4 y. ; lat. 12 y.; lat. isthm. 7,5 y. ; crass. 6,5 y. (PI. XXIII, lig, 64 ). 
Antioquia : Laguna above Medellin, Central Andes ; altit. 23 oo m. i\ os 1 
and 2. 
This minute species should be carefully compared wilb C. Novae Semliae Wille, 
and its var. sibericum Boldt, from both of whicb it is distinguished by (lie more rounded 
latéral angles ol' l lie semicells, which are furnished with blunlly rounded granules (not 
acute denticulations), by (lie absence of tbe central pa pilla of tbe semicells, and by tbe 
oblong vertical view witli parallel sides. 
203. Cosmarium bacillare Lütkem. (= Penium inconspicuum W. and G. S. West). 
— Antioquia : n° 5 . 
Long. 1 5, 5 y . ; lat. 4)7 y. 
204. Cosmarium bireme Nordst. — Cundinamarca : n° 23 . 
Long. 10 y. ; lat. 10 , 5 y; lat. isllirn. 2 y; crass. (c. papill.) 7p.. 
205. Cosmarium Biyttii Wille. — Antioquia: n° 5 . 
206. Cosmarium Clepsydra Norbst. (= C. Bicardia Reinscii). — Antioquia : n° 5 
(frequent). 
207. Cosmarium columbianum sp. nov. 
C. subparvum, circiter r J / 5 -plo longius quam latum, profunde constriclum, sinu 
angustodineari extremo levissime ampliato ; semicellulæ pyramidato-trapeziformes, angulis 
inferioribus rotundatis, lateribus in parte superiori levissime concavis, in parte inferiori 
triundulatis, angulis superioribus paullo rotundatis et vix emarginalis, apice recto vel 
levissime convexo et biundulalo, intra angulum inferiorem unumquemque granulis 4 vel 5 , 
et infra apicem sérié transversa granulorum 4 (granulis binis in medio majoribus), in 
centro semicellularum leviter incrassato; a vertice visæ ellipticæ, polis leviler 5 -undulatis 
et cum granulis paucis intra polos, lateribus leviter tumidis et incrassatis ; semicellulæ a 
latere visæ subglobosæ. 
Long. 45-47 y; lat- 36-38 p.; lat. apic. 20-21 y; lat. isthm. 1 1 — 1 1 ,5 y; crass. 24-25 y. 
(PL XXIII, fig. 68-69). 
Cundinamarca : Laguna de LTbaque, Eastern Andes ; altit. 2066 m. N° 23 . 
This species was frequent amongst large numbers of C. Quadrum. The form of 
tbe semicells and the nature of the granulation are quile distinctive. In general outward 
