480 
Transactions of the Society. 
Some slender forms of this species were observed from the New 
Forest (long. 405-418 y; lat. 28-34 y), with rather more attenuate 
and slightly recurved apices; some of these were distinctly but 
minutely asperulate, being covered with somewhat irregular and 
depressed granules. 
3. C. turgidum Ehrenb. I. Ep. III. Th. YI. N. VIII. L. 
4. C. frselongum Breb. III. Mp. 
Forma brevior West. I. Ep. II. Put. (with zygospores). 
III. Fh. 
5. C. Pritchardianum Arch. VIII. Tm. (with zygospores). 
Long. 440-590 y ; lat. 35-46 /a ; lat. apic. 7-8 y ; diam. 
zygosp. 83-108 y. 
This species was observed with zygospores in quantity. The cells 
were of the same proportions as those described by Archer, but the 
apices were generally a little narrower. The cell-membrane was of 
a uniform golden-brown colour, and the fine striolations, which con- 
sisted of a series of fine puncta, were arranged subspirally as in forma 
crassa Gutw. (in Bosprawy Akad. Umiej. Kratow. Wydzial. mat.- 
przyr., t. xxiii. (1896) p. 38, t. v. f. 13). Towards the apices, how- 
ever, these puncta became irregular (cf. PI. I. fig. 4). One zygo- 
spore was noticed which had been produced by the conjugation of three 
individual cells (PI. YI. fig. 5). 
6. C. Siliqua sp. n. (PI. YI. figs. 1, 2.) 
C. submediocre, cellulis diametro circiter 10-plo longi- 
oribus, leviter curvatis, dorso modice curvato, in medio subrecto, 
et prope apices levissime concavo, ventre levissime concavo, 
parte mediana cellularum cum lateribus subparallelis, apices 
versus gradatim attenuatis, apicibus subangustatis, levissime 
recurvatis subrotundatisque ; membrana achroa glabra ; pyre- 
noidibus in serie singula subirregulariter dispositis, in semi- 
cellula unaquaque 7 vel 8 ; locellis apicalibus terminalibus et 
corpuscula oblonga singula includentibus. 
Long. 217-250 y ; lat. 21-24 y ; lat. apic. 4 y. 
III. Ew. 
This species is distinguished from C. Pritchardianum Arch, by 
its much smaller size, its much more tapering and narrower ex- 
tremities, as well as by its smooth and colourless membrane. From 
C. littorale Gay it differs in being a little longer, in the absence of 
the slight ventral inflation, and in the blunter and slightly recurved 
apices. It may also be compared with C. subangidatum Gutw., from 
which it differs in the subparallel median portion of the cells, in the 
absence of the ventral inflation, in the more convex dorsal margin, 
as well as in the recurved apices. From all the above, the living 
examples are distinguished by the terminal locellus possessing but 
one oblong movable corpuscle. 
