299 



varies considerably, in one specimen the maximum was eleven while in another 

 it was twenty-eight. They are very strong and conspicuous. They consist of 

 three to four spines and project beyond the margin giving the latter a serrated 

 appearance. The zooid-plate is large and mai'ginal. The polyps occur on both 

 sides of the pinnules, seven to eight rows on the ujjper and five to six rows on 

 the lower surface. There are no limy needles either in the zooid region or in 

 the stalk and keel. No zooid-streak was found. 



Locality : Andamans. 



Previously recorded from Singapore. 



Pteroeidcs hymenocaulon, Bleeker. 



A small very flaccid colony of a brown colour. 



Total length of colony 60 mm. 



Length of rachis 40 mm. 



Breadth of rachis .30 mm. 



Length of stalk 20 mm. 



Thickness of stalk 7 mm. 



Number of pinnules 21 



Number of rays .11 



Length of pro-rachidial margin of largest pinnule . 12 mm. 



Breadth of insertion of largest pinnule ... 4 mm. 



Breadth of largest pinnule 10 mm. 



Distance between pinnules 3 mm. 



The stalk is soft and spongy and contains numerous small needles. Both 

 the pro-rachidial and meta-rachidial surfaces are free throughout their entire 

 length. The pinnules are thin and lancet-shaped, and are supported by long 

 rays, consisting of two to three spines, which project in many cases 2 mm. The 

 zooid-plate is large and marginal but is not visible to the naked eye. The 

 polyps occur on both surfaces of the pinnules in several rows. There are many 

 large limy needles in the polyp region but none in the stalk and keel. The 

 colour is brown with bluish patches occurring irregularly. 

 Locality : Nicobars. 

 Previously recorded from Amboina. 



Pteroeides steenstrupi, Kolliker. 



An imperfect specimen, the tip of the rachis being broken off. 

 Total length of colony ..... 



Length of rachis 



Breadth of rachis . . ' . 



Length of stalk 



80 + mm. 

 45 + mm. 

 37 mm, 

 35 mm. 



