— 136 — 



10 — 20 fathoms. It is found in the sea round St. Jan. Off Cruz 

 Bay and off America Hill. It was growing partly on shells and 

 stones, partly also upon the loose bottom itself. 



Halimeda Opuntia (L.) Lamx. 



Lamouroux, 1. c. p, 186. Barton,'], c. p. 18. 



var. typica Barton, 1. c. p. 20. 



var. triloba (Decsne.) Barton, 1. c. p. 20. 



H. Opuntia occurs most often in shallow water, but once I 

 have found it in deeper water in about 10 fathoms; it occurs both 

 on sheltered and on more exposed coast, var. triloba being a more 

 sheltered form, var. typica also occurring on more open coast; it is 

 often found in the lagoons lying like large cakes loose upon the 

 bottom. 



It is a very common species, found everywhere with the ex- 

 ception of at the most exposed localities only. 



Halimeda incrassata (Ellis et Solander) Lamx. 



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

 Barton, The genus Halimeda 1. c. p. 25. Corallina inrassata Ellis et Solander, 

 The natural history of many curious and uncommon Zoophytes, London 1786, 

 p. Ill, tab. 20, fig. d, di-d 3 , Di-D 6 . 



Halimeda tridens, Howe Phycological studies III, (Bulletin of the Torrey 

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



Howe (1. c.) is of the opinion that the name of this species 

 ought to be tridens and not incrassata contrary to Mrs. Gepp 

 who called the species incrassata. Both these species-names were 

 created by Ellis and Solander I.e. and afterwards used by later 

 botanists, until we now, in recent years, consider them as belong- 

 ing to the same species, and the question is therefore open which 

 name we shall prefer. In his paper quoted Dr. Howe writes as 

 follows: "Mrs. Gepp, in her monograph of "The Genus Helimeda" 

 (Siboga-Exped. LX) has adopted the specific name incrassata, presu- 

 mably because Ellis & Solander's description of .their Corallina in- 

 crassata was accompanied by the more numerous and more de- 

 tailed figures. The Rochester and the Philadelphia codes of bo- 

 tanical nomenclature give preference in such cases to the name 

 having "precedence of position", which would here call for the 

 adoption of the specific name tridens, the name which, fortunately, 

 in America, at least, has been the more generally employed". As 



