; 23 
C. Be ea ninil, Bréb, Form agreeing with 0. gestae Elfv. 
Hab.: Waters of the Gulf country, Dr. Thos. L. Baner, 
C. trachypleurum, Zuvnd., var. minor, Rae. 
Hab.: Waters of the Gulf country, Dr. Thos. L. Bancroft. 
C. binum, Nordst., var. australiensis, Borge (n. var.). 2 
tion about twice as long as broad; sides ve semi-cells almost abated: 
upper corners eonndeds notches about 20; median granules 
distributed in 5 vows and below one re ntal row of 5 granules ; 
membrane granulated towards the margin, granules distributed sinely 
in one interior series and in pairs in two exterior series. Length of 
| seni-cll, 21-22 rh breadth, 28-29 ,; breadth of isthmus, 1 pb 
Borge. (Plate XY.) 
Hab. : ie of the Gulf country, Dr. Thos. L. me meus perhaps be 
signed to C. binu um, var., Rac. Non. Desm., p. 21, Plate V., fig. 
C. Phaseolus, Breb., 8 elevatum, Nordst. Smaller form. 
length, 19-20 nw; ‘bread th, 18 »; breadth of isthmus, 5°5 p. 
Hab.: Johnstone River, Dr. Thos. L. Baneroft. 
C. angustatum (Wittr.), Nordst. Form with semi-cells 
pally attenuated from the base. Length of cell, 27-28 »; breadth, 
#; breadth of isthmus, 4 p. (Plate X 
Hab.: Waters of the Gulf country, Dr. Thos. Zz Bancroft. 
in th ot without ane ye that I have assigned this form to C. angustatum ; 
e principal form vertex is more depressed ; a form which seems somewhat 
Mere nearly Sa to that described by me is f. australis, Rac. Desmidya Ciastoni, 
P. 366, Plate L, fig. 2 
¢ dubia, Borge (n. spec.). Small Cosmarium twice as long as 
ad, almost rectangular, sinus straight and narrow ; semi-cells with 4 
und tions ; sides almost straight ; inferior corners somewhat straight; 
el 
ta ea of the Gulf country, Dr. Thos. L. Bancroft, 
sranatum, Breb. Dimensions, 32-20 p. 
wy Pnogge District ; Blackstone, 7 wich; and Jenkins’ Quarry, B 
2. Byrom ks ar. ot the Gulf country, Dr. Thos. . Ba cart ; 
og. 
ant 
igh Bay, z. Dal 
= rag Schmidie 8a a ‘Phe cell-dimensions are 38 : : 25-28 pb. ess 
& Rembrat’ are slightly. rounded at the vertex, and have ange a ae 
e thickened inwards. The latter is covered va ee 
- Very slightly raised elevations. The appearance 
me: pet a sane t at sides.” 
— Plate I) that of a narrow ellipse, with almost pa 
Seal : Bi calls in some respect 
ackstone, Ipswich, W. J. Pyram. The form recalls i 
natum uence 7 punctata, Tuer, Alg# 0 of the _ ie ae 
: aoe Bar | Pate II, figs. 8a and 4. For comparison Turner's hg 
ih se "coke W. Schmidle (n. var.). Pro-- 
