WEBER-VAN BOSSE—MARINE ALG 285 
preparations the peculiar glands described by Mr. Borgesen. To what extent, however, 
these differences depend upon the depth at which the plant was gathered, I do not 
venture to say. The specimen—and it is only a fragment—gives the impression of being 
still very young and therefore I wish to be doubly cautious in my opinion as to it. 
Fam. DELESSERIACE A. 
Hypociossum, Kitzing. 
1. HYPoGLossuM spec. 
Amirante, 25 fms.; dry specimen. 
A fragment; probably Hypoglossum spathulatum (Wiitz.), J. Ag. (Delesseria hypo- 
glossoides, Harvey, Austral. Alg.), but the specimen is too badly preserved to be 
identified with certainty. 
NitopHyLium, Greville. 
1. NrvopHYLLUM spec. 
Amirante, 25 fms. 
Only a poor fragment, attached to other alge and indeterminable, but with a. 
_tetraspore-bearing sorus typical of this genus. 
Fam. RHODOMELACEA, 
Subfam. LAURENCIE&. 
LAURENCIA, Lamouroux. 
1. Lavrencia nipiFica, J. Ag. 
J. Agardh, Spec. Alg. ii. 1863, p. 749. 
De Toni, Syll. Alg. vol. iv. sect. 11. 1903, p. 785. 
Aldabra, reef. 
Distribution. Sandwich Islands; Malay Archipelago. 
9. LAURENCIA OBTUSA (Huds.), Lamx. 
Hssai de classification, p. 42. 
De Toni, Syll. Alg. vol. iv. sect. 111. 1903, p. 791. 
Fucus obtusus, Hudson, Flora Anglica, ed. 3, p. 586. 
Aldabra, reef; dry specimens. 
Coetivy, reef; dry specimen. 
Egmont, reef and shoal; in alcohol. 
Distribution. Mediterranean ; Fiji Islands; Malay Archipelago. 
Laurencia obtusa is represented by two forms in the Stanley Gardiner collection ; from 
Aldabra there are three packets (nos. 4, 5, 8). No. 4 is the stoutest plant, no. 5 and 
SECOND SERIES—ZOOLOGY, VOL. XVI. 37 
