342 D. Prain — The Vegetation of the Coco Group. [No. 4, 



348. Gracilaria crassa Harv. 



In both islands ; in pools on coral sand. 



* Indian Ocean. 



349. Gelidium corneum J. Agardh. 



Great Coco ; on coral reefs ; also growing on Halimeda Opunfia, 



Almost Cosmopolitan. 



[A specimen of a Gelidium washed up by the tide on Little Coco, 

 was too much withered and bleached to be identified ; another was 

 collected there on the reefs, but in too early a stage of development to 

 be named.] 

 360. Caulerpa clavipera J. Agardh. 



Both islands ; on reefs. 



Cosmopolitan in tropical seas. 



351. Caulerpa plumaris J. Agardh. 

 Little Coco ; in pools on coral reefs. 



* Indian Ocean. 



352. Valonia pastigiata Harv. 

 Great Coco ; on coral reefs. 

 Indian Ocean and Pacific. 



353. Valonia conpbrvoides Harv, 

 Great Coco ; in pools on coral sand. 



* Indian Ocean. 



[A species of Valonia was collected on Little Coco also, but ia too 

 early a stage of development to be named]. 



354. Halimeda Opuntia Lamour. 



In both islands ; both on sandstone and on coral reefs, rather com- 

 mon. 



Cosmopolitan in tropical seas. 



355. SiPHONOCLADUS ? FiLiFORMis De Toni. 



Washed ashore on the coast of Little Coco after stormy weather 

 that prevailed for three days during our visit. 



356. Vaucheria sp. 



Little Coco ; on sandstone reefs. None of the specimens obtained 

 were in fruit. 



Andaman s and Nicobars, the same species apparently was found by 

 the writer to be plentiful in South Andaman and in Car Nicobar. 



357. Calothrix Pulvinata J. Agardh. 



Little Coco ; in pools above high water mark. 

 Cosmopolitan. 



358. . 



A Nostocaceous Alga in habit, very like the preceding, was obtained 



