jo33 
1 8 1 - Euastrum columbianum spec. nov. 
E. submediocre, pæne i 1 / 2 - p 1 ° Iongius quam latum, profundissime constrictum, sinu 
anguslo-lineari extremo leviler dilatatô ; semicellulæ trilobæ, in cisu ris inter lobos latérales 
et lobum polarem apertis et rotundatis; lobis lateralibus bilobulatis, incisura mediana 
rotundato-excavata, lobulis truncatis, lobulo superiori tridenlata, lobulo inferiori minus 
conspicue tridentata ; lobo polari lalissime cuneato-lruncato, apice recto, incisura mediana 
subprofunda et aperta, lateribus sursum divergent ibus, angulis dente majore et angulis 
incisuræ medianæ dente minore instructis, infra marginem apicalem cum dentibus 4; in 
centro semicellularum tumore magno cum annulo granulorum subirregulariter disposilio, 
dente obtuso intra lobulos inferiores juxta sinum ; a verlice visæ oblongo-elliplicæ, 
tumore magno granulato in medio utrobique, polis rolundalis cum dentibus parvis et 
lobo tridentato utrobique, lobo polari subrectangularibus cum dentibus majoribus 6 utro- 
bique et dente majore uno in medio lateris terminalis uniuscujusque ; a latere visæ rec- 
tangulari-trapeziformes, tumore magno granulato ad basin utrobique, angulis apicalibus 
denlatis, apice recto. 
Long. 72 [j.; lat. 54 [>■', bit. a [»ic. 42 p. ; lat. istlun. 11 p. ; crass. 35 - 3 7 p. (PI. XXII, 
fig. 34 ). 
Cundincimarca : Laguna du Paramo Gruz Verde above Bog'ota, Easlern Andes ; 
allit. 2700 m. No 24. 
E. columbianum appears to be a very characteristic species wbicb is perhaps nearest 
to E . incud /forme Bôrgesen (in Vidensk. Medd. naturli. Foren. Kjôbenli. 1890, p. q 4 o, 
t. 3 , f. 22). It differs, hovvever, in the nature of its central protubérance, in thc divided 
character of the upper latéral lobules, and in the general rectangular lorm of the polar 
lobe (as seen in vertical view). 
The lower latéral lobules of E. columbianum are entire, whereas l lie upper ones are 
divided inlo two sublruncate lobules (vide vertical view). The polar lobe, which is rec- 
tangular in vertical view, in fringed ail round witli large teeth, differing in lliis respect 
from any of the al lied species. 
182. Euastrum crassum (Bréb.) Kütz. var. scrobiculatum Lund. — Antioquia : no 5 
(abundant). 
1 83 . Euastrum crispulum (Nordst.) W. and G. S. West, Monogr. Brit. Desm. II, 
K)ô 5 , p. 72. (== E . sub/obalum var. crispulum Nordst., 1873 ; E . pyramidatum W. West, 
1892). 
Long. 28 p. ; lat. 18-19 F ! Jat. istlun. 4,5 p.. 
Antioquia: n° 5 (abundant). Cundinamarca : n° 24. 
184. Euastrum denticulatum (Ivracux.) Gay. — Antioquia : n° 5 . 
1 85 . Euastrum elegans (Bréb.) Kütz. 
Forma angulis basalibus semicellularum ut in E . fisso W. and G. S. West, ceteris ut 
in E. déganté (ypico. 
Long. 32 p. ; lat. 22 p. ; lat. istlun. 5 p.. 
IÔO 
