— 281 — 
seen in the Brit. Museum of A. Caliculus had 26 rays.!) 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. Caliculus; this is not 
mentioned by Solms. 
Therefore I do not think it possible to take A. Suhrü as a 
species. 
Acetabularia Caliculus 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. 
St. Thomas. 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 erenulatum (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 
thick; their diameter is about 140 y. 
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 (Möb.) Solms. 
Solms-Laubach, H., Monograph of the Acetabularieæ (1. c.); Howe, 
M. A., Observations on the algal genera Acicularia and Acetabulum 
1) The specimen drawn by Quoi and Gaimard seems also to have this number! 
