1025 
This miaule species is twisted into two complété turns of a spiral, wliich are so close 
together l liât lhe general aspect of lhe cell is ring-likc. The aclual extremilies of the cell 
are beat away from lhe plane of the spiral in opposite directions, 
A. Mayori should be compared with A. convolutus Corda (consult G. S. West in 
Ann. South African Muséum, IX, 1912, t. 1, fig. 5 -i 3 ), from vvhich it is distinguished 
by its smaller size, its relalively narrower cells, its two spiral turns, and the peculiarly 
compact way in vvhich the spiral is twisted. 
11 1 . Reinschiella obesa W. and G. S. West in Botan. Tidsskrift, XXIV, 1901, p. 100, 
t. 4 , f- 53 , 54 . 
Chromatophora singula, parietali, Ieviter lobala, sine pyrenoide. 
Long. cell. c. spin. 33-3 7 p. ; 1 a t . cell. 1 3 - r 4 p. 
Cundinamarca : n° i 4 - 
I11 the specimens observed the chloroplasts were well preserved. Eacli cell possessed 
one pariétal chloroplast occupying mosl of the side walls except al the pôles. Its margins 
were somewhat lobed and pyrenoids were absent. The species was first observed from 
the island of Ivoh Chang in the Gulf of Siam. 
There is no doubt that the or«anism described as Reinschiella siamensis W. and 
O 
G. S. West., l. c. p. 99, t. 4 , f. 52 [from the saine locality in the East] is an encysted 
state of one of the Peridinieæ. 
112. Scenedesmus bijugatus (Turp.) Kütz. — Antioquia : n os 1, 2 and 10. 
1 1 3 . Scenedesmus obliquus (Turp.) Kütz. — Antioquia : n os 1, 2, 3 , 6 and 8. 
1 1 4 - Scenedesmus denticulatus Lagerii. var. linearis Hansg. — Antioquia: n os 6 
and 8. Cundinamarca: n° 23 . 
Var. lunatus W. and G. S. West. — Antioquia : n° 6. 
r 1 5 . Scenedesmus quadricauda (Turp.) Bréb. — Antioquia: 11» 7. Cundina- 
marca : n° 14. 
Var. maximus W. and G. S. West. — Cundinamarca : n° 24. 
Var. rectangularis var» rsov. 
Cœnobiis e cellulis 2 vel 4 formatis, compactis, a latere visis pleruinque curvalis ; 
cellulis rectangularibus, lateribus redis, polis Ieviter convexis ; spinis ad angulos exte- 
riores cellularum terminalium brevibus et incurvatis et sæpe cuin spinis additionibus 
brevioribus ad cellulas ullas irrégularité!’ dispositis. 
Long. cell. i4-2i p; lat. cell. 6-10 p (Pi. XXI, fig. i 4 - 2 i). 
Antioquia: Laguna Santa Cita near Angelopolis, Central Andes ; altit. ifioo m. 
N os 1 1 and 12. 
This variety occurred in gréai quantity from lhe above-mentioned locality. No olher 
described variety of Scen. quadricauda possesses cells of the same shape as those of var. 
rectangularis. In outline tliey remind one of lhe cells of Scen. perforatus Lemm., but 
in olher respects the colonies are quite different. 
116. Scenedesmus acutiformis Schrôder var. brasiliensis (Boulin) W . and G. S. 
129 
