8 The Philippine Journal of Science isis 



Had I seen but a single preserved colony of L. rigidum, I 

 should probably have felt it necessary to consider it a variety 

 of L. philippinensis, but I have a considerable series of specimens 

 of each species, the individuals of which show characteristic and 

 consistent differences and do not intergrade, and as I have seen 

 the living colonies side by side where the differences are more 

 marked it seems necessary to consider L. rigidum and L. phil- 

 ippinensis to be distinct but closely related species of the genus 

 Lithophytum. 



LITERATURE 



KtJKENTHAL, W. Versuch einer Revision der Alcyonarien. II. Die Familie 



der Nephthyiden. 1 Theil. Zool. Jahrb. Syst. (1903), 19, 99-172. 

 Idem. Alcyonaria des Roten Meeres. Expedition S. M. Schiff "Pola" in 



das Rote Meer, nordliche und siidliche Halfte. Zool. Ergeb. (1913), 29. 

 Light, S. F. Notes on Philippine Alcyonaria. Part I: The Philippine 



species of the genus Capnella. Phil. Journ. Sci., Sec. D (1913), 8, 



435. 

 Shann, E, W. Observations on some Alcyonaria from Singapore, with a 



brief discussion on the classification of the family Nephthyidae. Proc. 



Zool. Soc. London (1912), pt. 3. 

 Thomson and Henderson. Report on the Alcyonarians collected by the 



R. I. M. S. S. "Investigator" in the Indian Ocean. I. The Deep Sea 



Forms. Calcutta (1906). 

 Idem. Ibid. II. The Alcyonaria of the Littoral Area. Calcutta (1910). 



