.< 
a, 
—— 
~ 
"ee, 
20 
arranged in two rows (7 x 7), the remainder smooth. Length of cell, 
59-60 »; breadth, 46- 47 »; breadth of isthmus, 14 p. — Borge. 
(Plate XIV.) 
| Johnstone River, Dr. Thos. L. Bancroft. 
mbles very much X. acanthophorum, Nordst.; differs, however, from that 
ae in a longer curved spines, which are hook- “shaped and arranged in $ 
different order.— Borge 
X. superbum, £/fv. Form wi ith sinus sbarp, not straight; 
semi- si 4 on each side furnished with 5 very slightly- -curved spurs 
and having 2 warts at the apex. Membrane in the middle use 
brown and scrobiculate. Length of cell with pte 91 p; brea 
with Shai 65 »; breadth of isthmus, 16-17 p. (Plate XV. 
: Rockingham ee J. Dallachy. 
_ x. i: * 
Hab.: Waters of the ae anc Dr. Thos. L. Bancroft ; Rockingham Bay; 
 ¥ Dallacky. 
* Tite 
ae ee 
a 
X. octonarium, Nordst. Freshwater Alge of New Zealand and 
Australia, p. 42, Plate IV., fig. 22. Yer ry rare. (Plate TL) 
yston road, Brisbe ane, W.J. Byram. The alga has probably ™ 
been seen . ee than by Nordstedt from 5 Zealand. 
ARTHRODESMUS, Ehbrenb. 
_ A. convergens, Fhrenb. 
ab.: Rockingham Bay, J. Dallachy ; Port Denison. 
r.). 
A. convergens, var. mucronatus, pete Ca hod “the 
view semi -cells 
breadth, 45-46 # 
breadth of isthmus, 9 p.— Borge. (Plate XIV. ) 
Hab. : Waters of the Gulf country, Dr. Thos. L. Bancroft. J 
A. apiculatus, Josh. Form tess sinus soon greatly ee tah ; 
back less curved than the semi-cells; in front view inflate f isthmus, 
side. Length of cell, 38-34 p; reaitl 32-33 p; breadth 0 
IV.) 
Hab.: Waters of the Gulf country, Dr. Thos. L. Bancroft. 
“ COSMARIUM, Corda. oe ee 
tesselatum, Delph. Nordsteatii, V 
Trashaates Alge, ’». 443. Pa 16. Length of ¢ : ell, roe BS 
breadth of cell, 48-51-58°5 2; breadth of isthmus, 32 5-325-36 Rockin tgha 
Bey Jt b Waters of the Gulf country, Dr. Thos. 5: Bancroft; ® 
Qe. cylindricum, Re alfs. 
pe Bay, J. Dallachy. 
Length 
C. excavatum, Nordst. Larger form, more excava tee g-11 & 
of cell, 3 38-49 BS breadth, 22-23°5 p; breadth of isthmus, 
(Plate XV. ) 
Hab.: Waters of the Gulf country, Dr. Thos. L. Bancroft: 
