25 
C. moniliforme (.urp.), Ralfs, forma. Cells twice as long as 
i ited by a narrow isthmus; four semi- 
cells often in series; cell membrane smooth. Diameter, 16-24 p.— 
Wolle’s Desmids of the U. S., 65. (Plate VIL.) 
C. utu forma. Professor Schmidle says:—‘ The cells 
agree well in their shape with O. minutum f. novizelandica, Nordst., 
yet the cell-membrane is strongly punctate, almost granular, like that 
= 0. ellipsoideum, var. notatum (from Sydney) in Raciborski 
esmids (wbi. sup.), p13. Dimensions, 29: 21p.” (Plate IV.) 
“aa Herston road, Brisbane, W. J. Byram. For Nordstedt’s figure see 
C. venustum, Bred. Length of cell equal to about 14 diameters ; 
constriction deep; sinus narrow linear; semi-cells have a flat base, 
hotches of equal size; ends truncate, and slightly retuse. One 
cholorophyl mass in each semi-cell; membrane smooth. 
24-30 u. “(Plate V. 
Form, Borge, with semi-cells gradually attenuated from the base, 
*pex slightly concave, membrane furnished with scrobicula above the 
7 breadth of 
Hab.: Rockingh: i is f is identical with C. 
40.: Rockingham Bay, J. Dallachy. Possibly this form is iden 
* ideas Wills, which ‘e cinnihed ven Roy and Bisset in Scott. Desm., p- 48, as 
YMous with C. venustum 
c. Venustum (Breb.), Arch.,f. minor, Wille. Nov. Seml., p. 
or Schmidle says:—‘ The dimensions are barely 18 : 12 » 
& 
= 
o 
bos 
@ 
DR 
BL 
: (In Wille 24: 18 p; in ‘West, Ireland, 21:16). The side lobes are 
a 
4 » 8 sna “re Galt are taken from Turner 
ly perceptibly inflated at the margins.’ 
ab.: Blackstone, Ipswich, W. J. Byram ; rare. 
f,Yenustum, var. hypohexagonum, Vest. 
e AXY., fig ze. 
Hab.: Herston road, Brisbane, W. J. Byram ; somewhat abundant. 
. hexagonum, Elf. 
‘ b.: Blackstone, Ipswich, W. J. Byram; rare. 
obsoletu Mask. The following is 
m, var. punctatum, “7%. 
eer Schmidle’s met te: Dimensions, 56:56 p.. The corners 
Polos netines furnished with spines on the under portion, sometimes 
ee into sharp points. A portion of i te 
have “ore according to Turner (Freshwater Alge of Hast in ia), 
: “a classed with C. palustre, Turner. (Plate III.) 
40. : : i 2 
The Lackstone, ipswiol, 1. J, BytS™ 2 card ea obsoletum, forma 
followi are lating to : 
) Wing descriptions of and eh water Algew of East India, 
Treland, p. 147, 
Plate III.) 
