— io36 — 



i>oi. Cosmarium angulosum RnÉn. \;ir. concinnum (l\Aiii:Mi.) ^^ . and (i. S. ^VEST. 



— Cuiiilinarnarca : ii" -l'S. 



2(ii. Cosmarium antioquiense sp. nov. 



('.. iiiiiuilissiimiiii, ciroilei' i '/(j-plo longius (|iiam latum, iiiodice constriclum, sinu 

 vaKle aiieiti) cl roltmilatci ; istlimo elons^alo ; scmicolliihi' obrenifornics, apice concavo el 

 glabro, marsrine roUmclald lalcrali uiioquotiiie (et iiailc |iarva apicis) cmii yraïuilis coii- 

 spicuis /|, el iiitra parlem lalcralçni inuiiii(]iieini|ii(> scmicclliila' ^raiiulis /( vel 5 iiislriu'- 

 ta-; celliila' a latere visa> ohlont^a-, vi.\ loiisliirla', parle siipcridii semicellulcC graïuilala'; 

 a vertice visa' oblonga-, laleiibus redis, polis roluiiclalis el. conspieue giaïuilalis. 



Long. i/( y.; lat. 12 (^.; iat. istlim. 7,5 [j. ; crass. 6,5 u. (PI. XXIII, li;;-. 04). 



Anlioi//ii(i : Lagiina aliove Medellin, Ceiilral Andes ; allil. ■2?>nn m. N°* i 

 and 1'.. 



Tliis minute species sliould be carefullv cunipared wilh f,'. Norae Scmllae Wii.lk, 

 and its var. sibericiim Boldt, from botli of wliieli il is distinguislicd l>y llie more roinuled 

 latéral angles of the scmicells, which are riiriiished willi bltintly ronndcd granules (not 

 acute denliculations\ by the absence oF ibe central papiila of the scmicells, and l)y ihe 

 oblong vertical view with parallel sides. 



203. Cosmarium bacillare Lûtkem. (= Peniiim Inconxpirnum W. and G. S. West). 



— Anlioquia : n" .5. 



Long. i5,5 p.; lat. 4,7 ."•• 



204. Cosmarium bireme Noudst. — Cundinamarca : n" 28. 

 Long. 10 \j.\ lat. 10, .5 !^.; lat. isthm. 2 p.; crass. (c. papill.) 7^.. 



205. Cosmarium Blyttii Wille. — Antioquia: n" f). 



206. Cosmarium Clepsydra Nobdst. (= C. Blcardld Reinscii). — Aiitioquia : ii" 5 

 (fréquent). 



207. Cosmarium columbianum sp. nov. 



C. subparvum, circiler i Vs-plo longius quam latum, profnnde constriclum, sinu 

 angusto-lineari exiremo levissime ampliato ; scmicelluhe pyramidato-lrapeziformes, angulis 

 inferioribus rotundalis, lateribus in parte snperiori levissime concavis, in parle inferiori 

 Iriundulatis, angulis superioribus paullo rotundatis et vix emarginatis, apice recto vel 

 levissime convexo el biundulalo, intraangulum inferiorem unumquemque granulis 4 vel 5, 

 et infra apicem série transversa granulorum 4 (granulis binis in medio majoribus), in 

 centro semicellularum leviter incrassato; a vertice visic elliplica-, polis leviter 5-undulalis 

 el cum granulis paucis intra polos, lateribus leviter lumidis el incrassatis ; scmicellula' a 

 latere visa' subglobosœ. 



Long. 4'^>-47 V-; lai- 36-,'38 \i-\ lat. apic. 20-21 ;/•; hil. isllmi. 1 i-ii,5 p.; crass. 24-2.5 \j. 

 (PI. XXIII, fig. 68-6.)). 



Cundinamarca: Laguna de Ubaque, Easlcrn Andes ; altil. 2066 m. N" 28. 

 This species was fréquent amongst large numbers of C. Onadriim. The form ol 

 the semicells and the nature of the granulation are quite distinclive. In gênerai outward 



