112 



but in the dimensions and form of the joints it is well 

 separated. 



Var. Ujpica is found in shallow water in sheltered localities, 

 especially in the lagoons where it often grows abundantly in the 

 soft bottom but also on more exposed coast and in deep water 

 down to a depth of about 30 meters. It is common at the islands. 



Forma gracilis was only found in Christiansteds Lagoon, 

 where it was growing in shallow water upon the soft bottom. 



'<^- 



Fig. 90. Halimeda incrassata (Ellis et Solander) Lamx. 

 var. monilis, f. rohustn Borgs. (About -h.:l). 



var. monilis (Ell. et Sol.). 



Barton, The genus Halimeda, p. 27. Corallina monile Ellis and So- 

 lander, Nat. Hist. Zooph. 1786, p. 110, pi. 20, fig. c. Halimeda monile Lamx., 

 Sur la classif. d. Polyp, corall., (N. Bull. Soc. Philom., Paris 1812, p. 186). 

 Howe, Phycol. Studies III, 1. c, p. 501. 



The specimens referred to this variety have commonly small 

 peripheral utricles as pointed out by Howe, in average maximum 

 diameter from 30 — -44 //, but exceptions often occur ; one specimen 

 in my collection (nr, 1695) had such groups of cells reaching even 

 a dimension of 80 ,« while most of the surrounding cells had a 

 diameter of 35 — 40/i. Other specimens from Rendezvous Bay, 

 St. Jan (nr. 1873 b) had also rather large cells (diameter from 

 35 — 60,«). Compare also the specimen (nr. 1601) mentioned in 

 my earlier paper p. 140. 



