81 



remarked that this species of KiiTzixG cannot be satisfactorily 

 distinguished from A. crenulata. On the faith of some original 

 specimens in KiiTzixci's Herbarium he has referred this species 

 to A. crenulata, being most probably founded on few and 

 badly developed specimens. The figure of A. caraibica of 

 KiiTziXG in »Tabul* phycologic8e«, vol. VI, tab. 93 also resembles 

 somewhat .4 . 6'a/iCM/?^5' and related forms, a fact Solms points out 

 when writing: »0n the other hand, it may resemble the following 

 form (A. Suhrii) very much if the apiculum disappears; indeed 

 Agardh has united them, as appears from his diagnosis ; however, 

 they are to be distinguished by the number and positions of the 

 coronal segments*. As to the last remark of Solms, referring to 

 Dr. Howe's paper 1. c, I may point out that in a specimen from 

 the Museum of Berlin and \\dthout locality, determined by Solms 

 as A. caraibica, three and four hair-scars were found whereas this 

 species according to Solms is said to have only two hair-scars. 

 In accordance with Howe I therefore think it impossible to main- 

 tain KiiTziXG's species^). 



Acetabularia Caliculus was found 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: 

 Specim. ex lierb. Mertens et Suhr (sub. nom. A. Suhrii Solms) in herb. Berol. 

 Geogr. Distrib. West Indies, Indian Ocean, Australia. 



Acetabularia crenulata Lamx. 



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

 1816. Solms-Laubach, Monograph, p. 24. Borgesex, 1. c, 1908, p. 281. 



Acetabulum crenulatum (Lamx.) Kuntze, Howe, Observations on the 

 algal genera Acicularia and Acetabulum (BuU. Torr. Bot. Club, vol. 28, 1901, 

 p. 331). 



It is much to be regretted that W. Arnoldi in a newly published 

 paper (Algologische Studien. Zur Morphologie einiger Dasycladaceen 

 (Bornetella, Acetabularia), Flora, Bd. 101, 1912) has referred an Ace- 

 tabularia from the Malayan Archipelago to A. caraibica mthout know- 

 ing Howe's and my treatises. When Arxoldi here WTites that both 

 the figures of Kutzing and the new figure of A. caraibica of MUe Vickers 

 are useless, then as to Kutzing's I quite agree with him, but that ol 

 MUe Vickers is a very good picture of a quite different plant, namely 

 Acicularia Schenckii. 



