16 
21. C . subspeciosum Nordst. 
Desm. arct. pag. 22, tab. 6, fig. 13. 
Forma paullo minor. 
Long. = 35 //; lat. = 27 p ; lat. isthm. = 14//; crass. 
= 21 //. 
Hekla Havn. 
22. C. capitulum Roy & Biss. 
Jap. Desm. pag. 195. 
var. Grönlandica n. v. tab. nostr. 1, fig. 5. 
A forma typica f. mea præcipue differt istbmo latiore, late- 
ribus semicellularum paullo rectioribus, angulis superioribus 
paullo magis productis et tenuioribus ; semicellulæ a vertice 
visæ angulis magis productis, crassitudine majore. Membrana 
distincte punctata. 
Long. = 23,5//; lat. = 21//; lat. isthm. = 9,7//; crass. 
= 13 //. 
Hekla Havn. 
23. C. microsphinclum Nordst. 
Desm. Ital. pag. 33, tab. 12, fig. 9. 
Forma, quæ a Boldt (Desm. Grönl. pag. 11) commemorata 
est. Tab. nostr. 1, fig. 6. 
Long. = 44//; lat. = 29//; lat. isthm. = 16//. 
Hekla Havn. 
24. C. Meneghinii Bréb. 
a) Formæ vulgari Jacobs. (Apercu, pag. 197.) f. Grön¬ 
landica proxima, differt autem medio semicellularum 
elevatione minore prædita. Cellula paullo profun- 
diore constricta. 
Tab. nostr. 1, fig. 9. 
Long. = 28 // ; lat. = 19// ; lat. isthm. = 5,5// ; 
crass. = 11//. 
Hekla Havn. 
b) Forma Reinsclm Istv. 
Borge: Sib. Chlorophyl. pag. 12, fig. 8. 
