30 
D. Ehrenbergii, 2a//s. 
Hab.: Waters of the Gulf country, Dr. Thos. L. ean Whitewater, near 
Mount Albion, Ch. W. Birch ; Rockingham Bay, J. Dalla 
D. basiundatum, W. and G. West. yea Alg. Madagase., 
a 45, Plate V., fig. 35 (sub sh wear ag, 3 Form 17-19 times longer 
an its diam ter ; apices attenuated. Length "of semi-cell, 253 
(call 543 »; breadth of semi- ‘Sil, 29- (cell) 30 pw; breadth of apex 
19°5-(cell) 19:5 p. (Plate XVI 
Hab. : Endeavour River, Persieh. 
W. G. West assert that the a pa form is about 26 times as it ng as 
broad ; peng to the dimensions cited, however, it is only 21-22 times ® 
long as broad. 
. burmense, Josh. Form with 14-16 constrictions in the ie 
cells, Breadth of base of semi-cell, 43-47 »; length of semi-cel, 
12-15 times greater; breadth of apex, 32-36 p. (Plate XVI) 
Hab.: Rockingham Bay, J. Dallachy. 
In the 2 Senet furnished by Joshua it is mentioned that the pa se 
is 15-20 t ong as broad; in a figure supplied, however, the semi-ce 
is at ieans: 12 cee as long as bro 
D. nodosum, Bail. Form with smooth membrane ; inflations i 
semi-cells, that is with elongated constrictions. Length of se Oe 
87-97°5-120-130-(cell) 274 1; greatest breadth, 31-34-39-42-45°9 Pi 
breadth of isthmus, 12-12-14- 22 Sip XVI.) Ba 
ab. : Waters of the Gulf country, as tae te oft Rockingham ?9y) 
J. Dallachy ; between Norman and Gilbert Rivers T. Gul 
Form agreeing with next form, but very large. Length of gs! 
cell, ~~ 267 »; greatest breadth, 84-85 p; breadth of “isthmus, P 
(Plate XVI.) 
Heli: Rockingham Bay, J. Dallachy. h 
D. nodosum, var. mammillata (2. var.). Varia ee 
inflations of the semi-cells furnished each with two pap! illee f isthmus, 
ef semi- co agit 128 »; greatest breadth, 53-54 p ; breadth of 18 
2 p. e XVI.) 
Hab. : tad Norman and Gilbert Rivers, 7. Gulliver. 
: th, 
D. tesselatum, Josh. Length of semi-cell, 208-280 pi ne 
36°5-44 uw. 
Hab.: Rockingham Bay, J. Dallachy. 
Plate IJ., fg: 
?D. cylindricum, Zurn. Alge of East India, p. 7 ets ells i 
ength © 
Hab. :  Wites of the Gulf country, De. Thos. L. Bancroft. -162'5 Bi 
? Form smaller, apex dilated. Le ngth of s emi-cell, 12 09.96 P 
greatest breadth, 26-29 »; breadth above the inflations, 
(Plate XVI.) 
Hab. : Johnstone River, Dr. Thos. L. Bancroft. 
dum (n. spec.). Large Dociaium, 4-6 times longer * rl on - 
ath about 
D. horrid . 
diameter, slightly constricted in the middle ; seni co al whot res 
4 whorls of projecting double spurs ; prominence b 
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