i o 1 5 
and the Columbian collections contained several distinctive American types, amongst 
which should be mentioned Desmidium œquale W. and G. S. West, Closterium turgi- 
dum subsp. giganteum Nordst., Euastrum attenuatum Wolle, E. brasiliense Borge, 
E. evolutum (Nordst.) W. and G. S. West, E. quadriceps Nordst., E. pictum Borges., 
Staurastrum Rotula Nordst. and St. trihedrale Wolle. 
There was also a plentiful sprinkling of more or less ubiquitous montane types of 
Desmides, probably to be accounted for by the altitude at which most of the collections 
were made. 
The abundance of ihree species of Co/eochœte ( C . scutata, C. puluinata and C. Nilel- 
larum), ail with spermocarps, from Laguna de Ubaque in lhe Department of Cundina- 
marca, is worthy of spécial mention. 
Several Flagellâtes of the généra Englena , Phcicus and T rachelomonas were obser- 
ved in the collections, bat they were not satisfactorily determined. 
Tliere was one plankton-collection (N° 21) from Laguna Pedropalo (ait. 2000 mètres) 
in the Department of Cundinamarca. This collection contained numerous Copepods and 
Nauplii, a quantity of a stérile species of Spirogyrci , Anabœna jlos-aqiiœ, Lgngbyci sp. 
(fragmenlary, but probably L. œstuari), Eunotia lunaris, Oocgstis natans, Staurastrum 
paradoxum var. longipes and St. leptocladum var. rie g a ns. 
Myxopliyceæ. 
Tamily Chroococcaceæ. 
1. Myxobactron hirudiformis G. S. West in Ann. South African Mus. IX, 1912, 
p. 63 , t. 2, f. 54 - 6 o. — Antioquia : n os 1 and 2. 
This Alga lias only previously been seen from S. W. Africa. 
2. Chroococcus minor (Kütz.) Næg. — Antioquia: n° 10. Cundinamarca: n" s 23 
and 24. 
3 . Chroococcus minutus (Kütz.) Næg. — Antioquia : n° 3 . 
4 . Chroococcus cohærens (Bréb.) Næg. — Cundinamarca : n° 24. 
5 . Chroococcus turgidus (Kütz.) Næg. — Cundinamarca: n os 23 and 24. 
6 . Chroococcus macrococcus (Kütz.) Rabenh. — Cundinamarca : n° 24. 
7. Microcystis pallida (Farlow) Lemm. Diam. colon. 76-102 p. ; diam. cell. 5-6 p.. 
— Cundinamarca: n os i 4 and 23 . 
8. Aphanothece microscopica Næg. — Antioquia : n° 7. Cundinamarca : n° 23 . 
9. Aphanothece saxicola Næg. — Cundinamarca: n° 24. 
10. Merismopedia glauca (Ehrenb.) Næg. — Cundinamarca: n° 24. 
