82 



The specimens found (Fig. 66) seem to 

 agree very well with the description of Solms 

 and Howe. Younger specimens were often 

 found with 2 — 3 discs above each other, the 

 older ones generally had only one. Plants 

 in all stages of development occurred. The 

 gametangia were spherical except the inner- 

 most of them nearest the stipe which were 

 oval, the space in the rays being very nar- 

 row here. The gametangia have a very thick 

 wall about 8 u thick ; their diameter is about 

 140^. 



I have only once found this species in a 

 mangrove swamp in shallow water near the 

 shore on shells etc. in muddy bottom. 



St. Thomas: Bovoni Lagoon. 



Geogr. Distrib. West Indies, Florida. 



Fig. 66. Acetabularia 



crenulata Lam. 

 Two plants fixed on 

 a shell. (About 1:1). 



Acicularia d'Archiac. 



Acicularia Schenckii (Mob.) Solms. 



Solms-Laubach, H., Monograph of the Acetabularieae (I.e.); Howe, 

 M. A., Observations on the algal genera Acicularia and Acetabulum (Bull. 

 Torrey Bot. Club, 28, 1901, p. 321). Borgesen, F., L c. 1908, p. 281. 



Acetabularia Schenckii Mobius, Bearbeitung der von H. Schenck in Bra- 

 silien gesammelten Algen. Hedwigia, Bd. 28, 1889, p. 309. 



Acetabularia caraibica, Vickers, Phycologia 

 Barbadensis, tab. 49. 



A few specimens were found in a 

 collection of Acetabularia crenulata. 

 They agree very well with the descrip- 

 tion of Howe (1. c. p. 323 — 4). In 

 specimens with gametangia these be- 

 fore decalcification stuck together in 

 the calcareous mass mentioned by Solms. 

 The gametangia were about 70—80// 

 in diameter. Corona superior and in- 

 ferior have both rather thick walls and 

 agree very well with the figures by Solms 

 (1, c. pi. 3, figs. 12 and 4); the first has 



two hair-scars one behind the other. ^. „„ , . , • ^, 



„, ,. ■ r, , , , i-,,i 1 , Fig. 63. Aciculana Schenckii 



Ihe disc IS flattened or a little bent (Mob.) Solms. (About 2M2 : 1). 



