‘ ~ De B Arch., Form, Nordst., Desm. Arct. P 
22 : | 
i 
with that given by Ralfs, the aaa is not so complete. a yr | 
is C. poate Weer, Freshwater Alg. of Madagascar, p late VIL 
which, however, davinkes in ‘ak Mea different dimensions fl ‘anil differently 
arranged and more widely separated from each other. Compare also C. quaarum, 
ene minus forma, Schmidle, Freshwater Alge of ‘Australia, p- 309, fig. 14. See 
late IT. | 
C. nea cdeateetacene dag und. 
: Johnstone River, os Thos. L. Bancroft. 
C. Askenasyi, Schmidic. Alg. Sumatr., p. 304, Plate IV., fig. 7 
Smaller form with median suture afterwards ” widened ; apex 0 of semi meet 
cells truncated. eek of semi-cells, 65 p; breadth, 91 p; bread 
of age 36-37 wp. (Plate XV.) 
b.: Waters of the Gulf country, Dr. Thos. L. Bancroft. 
maller form, median suture afterwards widened; § eur 
seen om the front with opening of the isthmus rounded ha 
the sides, truncated atthe apices. Length of cell, 137-138 4; brea 
111- pen »3; breadth of isthmus, 45°5 wp. (Plate XV. 
: Rockingham Bay, J. Dallachy. 
i all the specimens re nging to these two forms which I have arg 4 
membrane was finely punctate; on the other hand the ho rizontal row 0 nye 
points which are tu be fg at the isthmus, and which Schmidle trae co 
the Sumatra form. To species may, perhaps, be assigned as @ iar “dle 
rium spec, Mob., Austr. Peibetee Alg. IL., p. 340, Plate IL., fig. 20.— 
_ 99, Plate VII. : 
aryi, 
. 27. Length of cell, 138-159 p ; ‘breadth, 69- 2 B35 " preadth of 
a Nell 35-36 p 
. 1Watdes of the Gulf country, Dr. Thos. L. Baner roft. ing propo 
The form therefore differs a little from —— form in being 
a. slenderer, and having a smaller isthm 
C. turgidum (Br¢i.), — — III.) 
Hab.: Rockingham Bay, J. D 
C. pachyderm Tmum, Lund. Smallerform. Length of cell, 72-73 pi 
breadth, 562; breadth of isthmus, 27-28 ». (Plate III.) 
Hab.: Waters of the Gulf country, Dr. Thos. L. Bancroft. 
C. ellipsoideum, E/fv. Smaller form. is of ¢ 
— 21-22 »; breadth of isthmus, 45-5 p 
b.: Port Denison. 9 
Cc. eS etum (Hantzech), Renisch. Length of cell, ha ar 
bre soy 7 cell, 52-58°5-58°5 »; breadth of isthmus, 3 
s. L. Bancroft i Port ble 
ell, 24-2685 
Ha = Wat f th Th 
Rockingham Bay, J. Dalla a ademas : ah . 
C. pseudoprotuberans, Kirchn. Smaller form. Length of , 
24-25 uw; breadth, 21»; breadth of isthmus, 6'5 p- Gets 
Hab. : Qaebniiend, Gulf of Carpentaria, Dr. Thos. . L. Baneroft. ounded + a 
Larger form with upper corners of the semi-cells anor Length 
back pk at in vertical view semi-cells inflated on each *! ie ) 
of on 44»; breadth, 39 »; breadth of isthmus, sete ( 
+ Waters of the Gulf country, Dr. Thos. L. Bancra, 
