287 



Total length of colony . 

 Length of rachis . 

 Breadth of rachis . 

 Length of stalh . 

 Thickness of stalk 

 Number of pinnules 

 Number of rays . 



Length of pro-rachidial margin of largest pinnule 

 Breadth of insertion of largest pinnule 

 Breadth of largest pinnule {i.e., from the pro- 

 rachidial insertion to the middle of the meta- 

 rachidial margin) ...... 



Distance between pinnules .... 



This specimen agrees with KoUiker's description of F. nigrum, but although 

 the outer covering of the stalk and keel contains abundant limy needles, none 

 were found corresponding to his maximum mea.surement, riz., 15 mm. The 

 pinnules are fan-shaped and are supported by numerous longitudinally disposed, 

 interlacing calcareous rods. There is no indication of grouping into distinct 

 rays. The zooid-plate is large and basal and there is also a long narrow zooid- 

 streak on the upper part of the meta-rachidial surface. The polyps occur on the 

 upper surface of the pinnules in three or four rows, and each is supported by a 

 sheaf of small longitudinally disposed needles. The colour in spirit is whitish, 

 but there is evidence of loss of colour, bluish-black streaks occurring here 

 and there on the pinnules and on the keel. 

 Locality : Ganjam Coast, 14-9 fathoms. 

 The locality of KoUiker's specimen is unknown. 



Pteroeides lacazii, var. spinosum, Kolliker. 



To this very variable species we refer three specimens in the collection. 

 In all respects they fall within the degree of variation indicated by Kolliker 

 for the variety spinosum. 



Total length of colony . 



Length of rachis .... 



Breadth of rachis .... 



Length of stalk .... 



Thickness of stalk 



Number of pinnules . 



Number of rays .... 



' + denotes that the exact length is not definitely known. 



