284 
Transactions of the Society. 
Genus Docidiu7n Breb. 
D. coronatum Breb. C. 
Long. 430 /X ; lat. 38-40 /x. 
D. Ehrenbergii Kalfs. P., Do., Penmaenmawr. 
Some peculiar and large forms of this species were noticed which 
were somewhat inflated towards the base of the semicells. 
Long. 448 /x ; lat. medio 32 • 5 /x. 
var. granulatum Ealfs. C. 
var. ELONGATUM nov. var. 
25plo longius quam latum. 
Long. 575 fx; lat. medio semicellularum 22*5 /x. 
This variety has the frond about twenty-five times longer than 
broad. C. 
D. clavatimi Ktz. Do., A., B. 
D. nodulosum Breb. Do. 
JO. truncatmn Breb. P. 
D. baculum Breb. A., Do. 
JO. minutum Ealfs. Do. 
*var. gracile (Wille). (Penium minutum Cleve ^ gracile 
Wille). 
Long. 182 /x; lat. 9-10 /x. C. 
D. ELONGATUM nov. sp. Fig. 17. 
D. quadragies longius quam latum, ad utrumque polum 
sensim attenuatum, apicibus truncatis, medio non inflato. 
Long. 330 /x; lat. medio 8*5-9 /x; ad apicem 6 /x. 
Frond about forty times as long as broad, the straight sides 
gradually tapering from the uninflated base of each semicell 
to the truncate apex. C. 
Genus Closierium Nitzsch. 
G. didymotocum Corda. P., Do. 
Lat. 28-42 fx. 
C. obtusum Breb. C. 
Lat. 12*5 /X. 
C. lunula Ehrb. D., Do. 
C. ace^'osum (Schrank.) Ehrb. Do., A., D., B. 
C. la^iceolatum Ktz. 0., Do. 
C. turgidum Ehrb. A., D., S. 
C. prselongum Breb. C. 
C. inacilentum Breb. C. 
Lat. 11 /X. 
C. gracile Breb. D., Do. 
C. Ehrenbergii Meneg. Moel Fammau. 
C. moniliferum Ehrb. F., B., S. 
C. Jenneri Ealfs. P., Do., F. 
C. Leibleinii Ktz. P., A., B. 
G. Dianse Ehrb. Frequent. 
