48 



As minor peculiarities of nomenclature, not sanctioned by any 

 of the current codes, one notes, in Halimeda, the change of the 

 Ellis and Solander substantive specific name Monile to the ad- 

 jective form monilis and the attributing under Halimeda discoidea 

 of a var. typica to Howe, which superfluous varietal name was 

 never published or suggested by the person named. If "var. 

 typica'' were to be used at all in this case it should be made to 

 cover the original plant now preserved in the Museum d'Histoire 

 Naturelle of Paris and attributed (erroneously?) to Kamtschatka 

 rather than the larger and otherwise somewhat different plant 

 of Florida, to a photograph of which Borgesen refers. In 

 Caulerpa, one notes, several times repeated, the name C. Vickersii 

 Borg., which, being manifestly dedicated to the late Miss Vickers, 

 seems to violate Recommendation XII of the Vienna-Brussels 

 Rules by appearing in the masculine rather than the feminine 

 form. 



The numerous illustrations include half-tones from photo- 

 graphs, habit sketches, and drawings of microscopic details of 

 morphologic or diagnostic importance, and are both excellent 

 and artistic. 



The use of a sketch of the graceful Batophora Oerstedi, origin- 

 ally described from the Danish West Indies, on title-page and 

 cover, is most fitting and happy. 



In Part 2 of "The Marine Algae of the Danish West Indies," 

 which is concerned with the Phaeophyceae, Borgesen enumerates 

 40 species, distributed in 17 genera. The largest genera are 

 Dictyota with eight species, Ectocarpus with seven, Sargassum 

 with four, and Dictyopteris and Padina with three each. As 

 novelties are described and figured Ectocarpus coniferus, E. rho- 

 dochortonoides, Padina Sanctae-Crucis, and the genus and species 

 Rosenvingea Sanctae-Crucis. The new genus, which is dedicated 

 to the author's compatriot, the well-known phycologist, Dr. L. 

 Kolderup Rosen vinge, is placed in the Encoeliaceae, near Scy- 

 tosiphon and Chnoospora. Three extra-limital species also, 

 hitherto variously referred to Asperococcus, Encoelium, and 

 Hydroclathrus, are placed in the new genus. The type of the 

 genus, Rosenvingea Sanctae-Crucis, presumably came from the 



