61 
_ isripe, easily set free from its stalk. The antheridium is obtuse at 
the upper end. The antheridia represented in “The Alge of the 
 ‘Gazelle,’” Plate XI., had not come to perfection. ‘ 
The eystocarps (Plate XIV., Fig. 4) somewhat differ in shape from 
those which I have described in “The Alge of the ‘ Gazelle.’” 
They stand upon short, thick stalks, and are about as high as broad. 
In section I found the stalk about 75 p long, with a diameter of 25 p, 
the capsule about 250 » high, and 260 p» in diameter. 
This Polysiphonia seems to me to be nearly related to Ee 
havannensis, Mont., and P. insidiosa, Cronau, and to be distinguished 
from them by the scanty, irregular branching afd the elongated naked 
branches. It occurs in Australia and Oceania. ' 
_ acquainted with any further remarks upon the 
locality. A classification will commend itself as soon as the number 
of the known forms is somewhat greater. 
Hab.: Deception Bay, Moreton Bay, Dr. Thos. L. Bancroft. 
(Plate XV., Fig. 4; Plate XVI., Fig. 5,6; Plate XVIL., Fig. 1.) 
Prof. Askenasy adds :—“ As an appendix follow two new mariue 
_ alge from a collection which was remitted to me for determination 
_ through the agency of Dr. Christ, of Basle.” 
: SPHACELARIA. . 
Li b diata (n. sp.). Prof. Askenasy first gives the following 
_ satin description :— Habitu et ramificatione Sphacelarie cirrhose, 
ae th., vel Sphacelarie Hystrici, Suhr (Reinke, Sphacelariw, p- 13) 
 ‘Similis, thallus Laurencie Tasmanic Tm Ry 
pepttate, duobus radiis lanceolatis constitute, inter duos radios pilo 
emul porrecto instructs.” (In appearance and branching similar to 
_ Sphacelaria cirrhosa, Roth., or Sphacelaria Hystrici, Suhr. (Reinke, 
_ Sphacelaris, p. 13], thallus adhering externally to Laurencia Tas- 
‘Manica, stalked shoots consisting of two lanceolate rays, between two. 
_ ys furnished with a slender elongated hair). He then adds :—‘* The 
Fé. of attachment of this Sphacelaria are placed upon the outer sur- 
. of the thallus of the Laurencia. From these arise § 1 
q han’ Which bear as lateral shoots branches, germinating buds, an ( 
four pericent . 8 
' ‘icentral cells extend to the outer surface. The hairs procee 
subdivision from the apical cell; they ve ple 8-10 celled cell- 
oj ents, soon falling to pieces and perishing. As a 
| later ates on every transverse subdivision of the a 
" followin, 18 placed horizontally to the partitio 
wing each other often stand upon the same side of the axis. me 
‘Peci The two-rayed germinating buds particularly characteristic 0 ; 8 
ad €s stand upon a 5-8-celled stalk, whose inferior cells are gp! 
Undivided. Towards the upper part it becomes broader. The 
