DEVELOPMENT OF CYSTOCARPS IN CALLOPHYLLIS. 205 
Fig. 2. The same, x 355, showing terminal and secund sporangia. 
3. The basal cell-layer from which the upright filaments spring, X 355. 
4, A filament showing innovation of the filament after the escape of the 
tetraspores from a terminal sporangium, x 450. 
5. Terminal sporangium with tetraspores and innovation of a subterminal 
sporangium, X 450. 
Figs. 6-11. Rhodochorton Rothii, Nag. 
Fig. 12. R. floridulum, Nag. 
All drawn with Zeiss’s objective E, ocular 2, with drawn tube. The details of 
cell.structure are not indicated. 
Figs. 6, 7, 10. Various stages in the development of sporangia formed by 
innovation. 355. 
Figs. 8, 9. Innovation in vegetative filaments. X355. 
Fig. 11. Development of sporangia from buds of subapical cells; in one case 
the spores have escaped and a second bud is developing in the cavity 
of the empty sporangium. X355. 
Fig. 12. Sporangium in course of formation by innovation in R. floridulum. 
x 855. 
On the Development of the Cys carps in Callophyllis laciniata, 
Kitz. By A. Lorrain SmirH. (Communicated by D. H. 
Scorr, M.A., Ph.D., F.L.S.) 
[Read 5th June, 1890.] 
(Prate XXXV.) 
CALLOPHYLLIS LACINIATA, on which the investigation recorded 
below was made, belongs to the family of the Gigartinaceæ, one 
of the Florideæ. 
It has a flat isobilateral much-branched thallus. 
and the fruiting-thallus bears a large number of cystocarps. 
Harvey in his * Phycologia Britannica,’ vol. ii. plate 121, thus 
describes it under the name of Rhodymenia laciniata :— 
“Frond thickish, subcartilaginous, opake, bright red, more or 
less palmate or flabelliform, cleft into numerous broad wedge- 
shaped segments, which are again divided in a subdichotomous 
manner; the apices obtuse, the margins, when in fructification, 
curled and fringed with minute cilia, in which the tubercles are 
imbedded.” 
It is dicecious, 
