— 281 — 



seen in the Brit. Museum of A. CaUculus had 26 rays. 1 ) Lastly, 

 I would remark that the stipe in A. Suhrii, in any case on the 

 specimens examined from the Museum in Berlin, has quite similar 

 spindle-shaped swellings as are found in A. CaUculus; this is not 

 mentioned by Solms. 



Therefore I do not think it possible to take A. Suhrii as a 

 species. 



Acetabularia CaUculus was found at the south coast of St. 

 Croix where it grows in shallow water both in sheltered places and 

 in more exposed localities. 



In the first mentioned locality it was growing at the entrance 

 of a little lagoon with mangroves on sandy bottom fastened to 

 shells and stones. In the other locality it was found on a coral- 

 reef near the shore and was here constantly washed over by the 

 small waves. 



St. Croix. Lime tree bay; Long Point; White Bay. 



S t. T homa s. Herb. Berol., ex herb. Mertens et Suhr (sub. nom. 

 A. Suhrii Solms). 



A. crenulata Lam. 



Lamouroux, J. V., Histoire des Polypiers coralligenes flexibles, Caen 

 1816. Solms-Laubach, Monograph, p. 24. Acetabulum crenulatum (Lamx.) 

 Kuntze, Howe, Observations on the algal genera Acicularia and Acetabulum 

 (Bull., Torr. bot. Club, vol.28, 1901, p. 331). 



The specimens found seem to agree very well with the de- 

 scription 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 were found. 

 The gametangia were spherical except the innermost of them 

 nearest the stipe which were oval, the space in the rays being very 

 narrow here. The gametangia have a very thick wall about 8 jut 

 thick; their diameter is about 140^. 



I have only once found this species in St. Thomas, Bovoni 

 lagoon, where it was growing in a mangrove swamp in shallow 

 water near the shore on shells etc. in muddy bottom. 



Acicularia d'Archiac. 

 A. Schenckii (Mob.) Solms. 



Solms-Laubach, H., Monograph of the Acetabularieae (1. c.) ; Howe, 

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



*) The specimen drawn by Quoi andGaimard seems also to have this number! 



