the British Marine Algae . 
Class THALLOPHYTA. 
Subclass ALGAE. 
67 
Series I—CYANOPHYCEAE. 
Cohort L— CHROOCOCCmAE. 
Order I. — chroococcaceae. 
Gloeocapsa Nag. 
G. crepidinum, Thur. 4 ! 5 ! 9 ! 
Polycystis Kiitz. 
P. pallida, Farlow. 4! 
Order II.— chamaesxphonaceae. 
Dermocarpa Crn. 
D. prasina, Born. 4 ! 7 ! 9 ! 
f. olivacea, Holm, et Batt. 9 ! 
var. incrustans, Holm, et Batt. 4 ! 
D. violacea, Crn. 4 ! 
ar rosea, Holm, et Batt. 4 ! 
D. Leibliniae, Born. 419! 
D. Schousboei, Born. 4 ! 5 ! 8 ! 
Hyella Born, et Flah. 
H. caespitosa, Born, et Flah. 419! 
Order III. — hormosporaceae. 
Hormospora Br£b. 
H. ramosa, Thw. 4 18 ! 
Cohort II.— NOSTOCHXNAE. 
Section /. — HOMOCYSTEAE. 
Order I. — oscillariaceae. 
Tribe I. — Oscillarieae. 
Spirulina Turp. 1 
S. pseudotenuissima, Crn. 415! 
S. tenuissima, Kiitz. 4 ! 5. 6. 8 ! 9 1 (S’, oceanica , Crn. 
Holm. Fasc. No. 73). 
1 The Spirulina Hutchinsiae from Cumbrae, in the Trinity College Herbarium, 
Dublin, is stated by M. Gomont to be S. major , Kiitz. Harvey, Syn. p. 200, No, 
379, remarks, under N. Hutchinsiae , Kiitz., ‘Unknown to me’ (1857). 
F % 
