109 



Gepp's monograph, the anatomical structure of our form agrees 

 exactly with the description and figures given by Mrs. Gepp. 



Fig. 87, Ealimeda gracilis Harv. var. ojmntioides Borgs. 

 (About 1:1). 



St. Jan: Off Hermitage in the sound to the north of this island and 

 Tortola in a depth of about 30 meters. It was earher found at St. Thomas 

 by the »Challenger« Expedition and Mrs. Gepp tells me that forms from this 

 island exactly like mine are in the British Museum. 



Geogr. Distrib. In the tropic parts of the Indian and Pacific Oce- 

 ans, more seldom in the Atlantic. 



5. Halimeda incrassata (Ellis et Solander) Lamx. 



Lamouroux, Sur la classiftcation des Polypiers etc. (1. c. 1812, p. 186) ; 

 Barton, The genus Halimeda 1. c. p. 25. Borgesen, 1. c. p. 136. 



Corallina incrassata Ellis et Solander, The natural history of many 

 curious and uncommon Zoophytes, London 1786, p. Ill, tab. 20, figs, d, 

 di— d3, Di— Dc. 



Halimeda tridens Howe, Phycological studies III, (Bulletin of the Torr. 

 Bot. Club, vol. 34, 1907, p. 501). 



In my paper quoted I have given my reasons why I mean 

 we may use the specific name incrassata and refer to it here. 



Howe refers four species to his Halimeda tridens group, 

 namely, H. faviilosa Howe characterized by very large peripheral 

 utricles ; a form like this I have not found in the Danish West 

 Indies. Further besides the typical H. incrassata he considers 

 the var. monilis as a species and describes finally the new species 



