F. Børgesen: Rhodophyceæ of the Danish W. Indies. 



243 



cellular rhizoids ending with a small, lobed disc; but longer and 

 pluricellular rhizoids, too, are present. 



St. Croix: Christiansted's Lagoon. St. Thomas: Bovoni Lagoon. St. 

 Jan: Coral Bay. 



Geogr. Dis t rib. : Warmer parts of the Atlantic Ocean. 



2. Ceramiiim strict urn Grev. et Harv. 



in Harvey, Phycologia Brit., pi. 334. J. Agardh, 

 Spec. Alg. vol. II, p. 123. 



Specimens belonging to this species were 

 found in some few collections together with 

 other algæ. 



The axial cells reach a length of up to 

 400 /i, the breadth being up to 100//. The zones 

 -^re 50— 60/i high and 70— 110 a broad, thus 



a little smaller than is usually 



the case. Plants with tetra- 



spores and cystocarps were 



found. The tetraspores are 



arranged verticillately and 



often developed in the 



nearly straight summits of 



the filaments. 



This species has been found occasionally in 



shallow water in both sheltered and exposed lo- 

 calities. 



St. Croix: In the harbour of Christiansted, Coak- 

 ley Bay. St. Thomas: Store Nordside Bugt. 



Geogr. D ist rib. Warmer shores of the Atlantic 

 Ocean; Mediterranean Sea. 



Fig. 232. Ceraniium 



strictum Grev. et Harv. 



Zone of a filament. 



(About 225:1). 



H. E. P. del. 



Fig. 233. Cera- 

 mium transver- 

 sale Collins et 

 Hervey. Part of 



a filament. 

 (About 370:1.) 



3. Ceramium transversale Collins et Hervey. 



Collins, F. S. and A. B. Hervey, The Algae of Ber- 

 muda in Proc. of the American Acad, of Arts and Sciences, 

 vol. 53, No. 1, p. 145, pi. V, figs. 29—31. 



This well defined Cerammm-species has been 

 described in the above mentioned paper, recently 

 published. It is especially characterized by the 

 transversely elongated lower cells of the zones. 

 Specimens with tetraspores were found. 



16* 



