ALG^ feom: the west is^dies. 275 



35. Phormidium, sp. 

 Crass, fil. 1-2-1-5 fi. 



Stratum deuse, thin, and dark SBruginous. 



Hab. On damp wall, Eoseau, Dominica. (5-9-92.) No. 546. 



Ord. Chroococcace^. 



36. Chroococctjs MiJfOR, iVi^ey. {Gattung. e{nzell.alg.^.4i7, 

 t. 1a. f. 4. Bahh. Fl. Eiirop. Alg. ii. p. 30.) [Protococcus 

 minoT^ Kuetz. Species Algar. p. 198; Tahulce pTitjcolog. i. p. 3, 

 t. 3.] (PL XVI. fig. 17.) 



Diam. cell. 2-8-4 /z ; diam. fam. 11-5-30 ^t. 



Hah. On damp wall of dam, Sharp's Eiver, St. Vincent. 

 '^o. 477. On trees, summit of Trois Pitons (4500 ft.), Dominica. 

 No. 603. 



Forma minima. (PI. XVI. fig. 18.) 

 Forma cellulis familiisque minoribus quam forma typica. 



Diam. cell. s. teg. 1-1*9 ^t ; diam. fam. 10-23 /x. 



Hah. Along with the type from the above-named localities, 

 and also on lime-trees, Shanford Estate, Dominica. No. 901. 



37. C. COH^REifs, JS'aeg. (Rahh. FL Europ. Alg. ii. p. 30.) 

 [Pleurococcus cohaerens, Bre'b., 1842. Protococcus cohaerens, 



liuetz.^ 



Diam. cell. 3-S-6-5 /.i (usque ad 7-5 /i) ; diam. fam. 30-173^. 



Hab. Amongst other algae on trees, summit of Trois Pitons 

 (4500 ft.), Dominica. No. 903. 



This usually occurred in small families, but occasionally in very 

 large ones, and now and then in solitary examples. 



38. C. TURGiDrs, A^a^'y. (Gatt.einzell.AJg. -p. 4Q. Bahh. Fl. 

 Furop. Alg. ii. p. 32.) [Protococcus turgidus, Kuetz. TahulcB 

 pligcolog. i. p. 5, t. 5. f. i.] 



Diam. cell. s. teg. 7'5-10*5 fx, c. teg. 21-23 ^. 

 Hah. On damp wall of dam, Sharp's Eiver, St. Vincent. 

 No. 477. 



A rather small form. 



39. C. scHizoDERiiATicus, West. {Alg. of the Fng. LaJce 

 Bistr. in Journ. Boy. Micr. Soc. Dec. 1892, p. 742, pi. x. 

 ff. 61-63.) (PI. XVI. fig. 19.) 



Diam. cell. s. teg. 11'5--13 fx ; diam. c. teg. 23-28 fx. 



Hah. AVith the preceding species, but much more abundant. 



