VN DR. G. S. WEST ON THE ALGÆ OF 
One form was noticed with four undulations instead of the two wide ones 
on the dorsal margin. Аз this feature at once marks it off from all the 
biundulate forms, it might stand as forma guadrinndulata. Long. 88 p; 
lat. med. 12 p; lat. арг. 85 д. 
63. EUNOTIA CRISPULA, sp. n. (Pl. 3. Но. 14.) 
E. submediocris, cellula ut in visa aspectu valvulari subelongatis et levissime 
curvatis, polis subangustis sed rotundatis, margine ventrali et dorsali valde 
undulato-noduloso, nodulis dorsalibus iis ventralibus alternantibus ; striis 
validis, 8 in 10 ш; nodulis terminalibus eonspieuis; in aspectu cingulato 
rectangulari, lateribus levissime et latissime biundulatis. 
Long. 41-112 w; lat. 11-1275 ш: lat. pol. 5-675 д. 
Hab. Yan Yean Reservoir, at the weedy margins (Mar. and June, 1905). 
This species of Æunotia is very characteristic, and I can find no published 
record of one which agrees with it. The crinkled nature of the valves, with 
the alternating nodulations of the dorsal and ventral margins, and the com- 
paratively slight curvature, are its distinguishing features. The apices are 
somewhat narrow, but rounded and exactly equal, and the terminal nodule is 
ventral and conspicuous. The striations are rather coarse and very distinct. 
The individuals varied much in length and consequently in the number of 
nodulations. According to the length there are from 3 to 7 nodulations on 
the dorsal margin and from 2 to 7 on the ventral margin. In the more 
elongated individuals both margins possess an equal number of nodulations, 
but in the shortest forms there are three dorsal and only two ventral 
nodulations. In the girdle-view the cell is rectangular and the longer 
margins of the valve are very slightly biundulate. 
The nodulation of Æunotia crispula reminds one very much of Actinella 
mirabilis, Grun., but the extremities of the valves are not asymmetrical, and 
the cells are not united to form colonies as in Actinella and Пезтадотит. 
E. erispula was also frequent in some collections made by Mr. Hardy at 
Heidelberg, Victoria (Mar. 1905). 
Family NAVICULACEZE. 
Genus NAVICULA, Ehrenb. 
64. NAVICULA BICAPITATA, Lagerstedt, Spitsberg. Diat. p. 23, t. 1. fig. 5 ; 
Van Heurck, Synops. Diat. Belg. р. 18, t. 6. fig. 14. 
A form identical with Pinnularia interrupta, №. Sm. (1853), forma biceps, 
(Greg.) Cleve, Synops. Navic. Diat. ii. (1895) р. 76 (= N. biceps, Greg., 
1856 ; P. interrupta В, W. Sm. Brit. Diat. ii. p. 96). (РІ. 3. fig. 13.) 
This Diatom occurred in considerable abundance both in the plankton and 
among the weeds at the lake-margin. The extremities are less capitate than in 
