292 MESSRS. W. WEST AND G. 8. WEST ON 
In 1890 Béórgesen described two new species of Euastrum 
from Brazil E. incudiforme and E. Glaziovit. These two 
species we must consider as merely varieties of E. evolutum, after 
examining forms which are certainly intermediate between them 
and the latter species. We give a figure of one of the transitory 
forms between the type and var. Glaziovii (Pl. 16. fig. 11). 
E. Nordstedtianum var. elegans, W. B. Turner (in K. Sv. Vet.- 
Akad. Handl. Bd. xxv. no. 5, p. S5, t. 11. f. 17), if correctly 
described with “semicellule tumoribus 9 (6 margine, 2 sub- 
apice, et 1 grandis centrali parte dispositis) ornatz," must belong 
to some other species and not to JE. evolutum. Also E. micra- 
canthum, W. B. Turn. (l. c. p. 82, t. 10. f. 33) may belong here, 
but again if “ tumoribus 8 (4 lateralibus, 2 apicalibus et 2 lobum 
polarem versus) ornate” be correct, it must be relegated 
elsewhere. 
The following are the varieties of this species :— 
Forma minor. (Fig. xylogr. 1c.)—E. Nordstedtianum var. 
minor, Wolle, Desm. U. S. p. 106, pl. 26. f. 8. 
Long 47 p; lat. 30 p; lat. isthm. 8 p. 
Hab. Minneapolis, Minnesota; Orono, Maine; Harvey Lake, 
Pennsylvania, &e. 
Var. INCUDIFORME, nob.—E. incudiforme, Bérgesen, in Vidensk. 
Medd. Foren. Kjóbenh. 1890 (1891), p. 940, t. 3. f. 22. 
Var. lobis lateralibus cum spinis paucioribus; lobo polar 
obverse triangulari, marginibus lateralibus glabris, angulis 10 
spina valida productis, apice truncato cum dentieulis paucis. 
Borgesen’s dimensions are :— Long. 55 p; lat. 39 p; lat. isthm. 
75 p; crass. 24 p. 
Hab. Brazil. 
Var. GUIANENSE, nob.—E. Glaziovii, Bérg., var. guianense, 
Racib. in Flora, lxxxi. (1895), p. 33, t. 4. f. 19. 
Var. lobo polari subrectangulari, angulis apicalibus cum 8p 
valida, apice convexo. 
Raciborski’s dimensions are:—Long. 42 p; lat. 28 p; 
isthm. 5 p; crass. 20 p. 
Hab. Tapakoomasee, British Guiana. 
Raciborski's figure appears to us somewhat crude, but we bare 
no doubt that it is a form of E. evolutum. 
Var. Grazrovir, nob.—E. Glaziovii, Bórgesen, l. ¢. P- 941, t. 3. 
f. 23. 
. . . . + minoribus 
Var. lobis lateralibus subconfluentibus cum spinis mino 
ina 
lat. 
