SYSTEMATIC DISCUSSION 



PART I 



MARINE ALGAE 



There were but two species of marine algae obtained by the 

 "Alva" World Cruise of 1931-32, both of which were collected 

 incidentally with marine invertebrates on Teviatoa Reef, Raiatea 

 Island, Society Islands. The first plant, Caulerpa %vehhiana Mon- 

 tagne variety tomentella (Harvey) , a littoral, circumtropic species 

 of the Chlorophyceae, is here reported for the first time from the 

 Society Islands and is apparently the only published record of 

 this variety in an American museum. A very fine cluster of Cheilo- 

 sporum sagittatum Lamouroux, a remarkably beautiful calcareous 

 algae, member of the Corallinaceae, establishes the first record in 

 the Society Islands and greatly extends the known geographic 

 range of this species to the eastward in the south Pacific. The 

 present material is apparently the only specimen of sagittatum 

 in an American depository. 



Chlorophyceae 



Siphonales 

 Family: CAULERPACEAE 



Genus: CAULERPA Lamouroux 

 Caulerpa webbiana Montagne variety tomentella (Harvey) 



Plate 1 



Type: The type of C. ivehhiana was collected in the Canary 

 Islands and is deposited in the Paris Museum; the type of Dr. 

 Harvey's tomentella came from the Tonga Archipelago and was 

 deposited in his cabinet. Trinity College, University of Dublin. 



Distribution: This species, together with its several varie- 

 ties, is practically circumtropic in the littoral zone, having been 

 reliably recorded from the Canary Islands, the West Indies, espe- 

 cially the Virgin Islands, also at Pernambuco, Brazil, the Red Sea, 

 Japan, Tongatabu and now from the Society Islands, the present 



