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. Distrib. : Warmer parts of the Atlantic Ocean. 



2. Ceramium strictum 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 algae. 



The axial cells reach a length of up to 

 400 //, the breadth beinguptolOOy. The zones 

 are 50 60 // high and 70 110 // 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. Distrib. Warmer shores of the Atlantic 

 Ocean; Mediterranean Sea. 



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. 2931. 



This well defined Ceramium-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* 



Fig. 232. Ceramium 



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.) 



