Weber-van Bosse, one notes the proposal of several new species 

 and of one new genus, Herpyzonema, of the family Stigone- 

 mataceae. 



The points of contrast between the marine flora of the East 

 Indies and that of the West Indies are perhaps nowhere more 

 obvious than in the order Siphonales of the Chlorophyceae. Of 

 the twenty-five species of the genus Caulerpa, here attributed to 

 the Dutch East Indies, ten occur also in the seas of tropical and 

 subtropical America. Among the Siphonales of West Indian 

 affinities, one notes that Acetahularia caraihica Kiitzing is main- 

 tained as a valid species. Through the courtesy of Mme. Weber- 

 van Bosse, the present reviewer,* about a dozen years ago, ex- 

 amined most of the original materials on which this species was 

 based and he expressed the opinion that they could not be satis- 

 factorily distinguished from Acetahularia crenulata Lamour., 

 described forty years earlier, the type of this also coming from 

 the Antilles. This view of A. caraihica has since been adopted 

 by Mr. F. S. Collinsf and by Dr. B6rgesen,t both of whom have 

 enjoyed good opportunities for knowing the West Indian plants 

 of this genus. The types of both of the alleged species being 

 West Indian, the question of their validity or identity is essen- 

 tially a West Indian rather than an East Indian question. Among 

 the Siphonales is a new genus Bryohesia Weber- van Bosse, first 

 published, however, two or three years earlier, but now illustrated 

 and described in more detail. 



Among the Phaeophyceae, Madame Weber uses ^^ Ilea (Fr.) 

 Nordstedt" for the genus currently known as Phyllitis, which 

 name, as remarked in the preceding review, legally belongs to a 

 genus of ferns. The name Ilea was first used by Fries for a genus 

 of Chlorophyceae and as such is in current usage. Under the 

 prevailing European rules of nomenclature, the taking up of Ilea 

 for a genus of brown algae may possibly be justifiable, in spite 

 of the confusion that it would entail, but the earlier use of Ilea 

 in an entirely different sense happily forbids any such boule- 



* Bull. Torrey Club 28: 331-333. 1901. 



t The green algae of North America 378. 1909. 



t The marine algae of the Danish West Indies 80, 81. 1913. 



