112 CEYLON PEARL OYSTER REPORT. 



broken specimens of about 2 centims. in height, flat and branched in yarious ways 

 and of a grey colour. The incrusting form has all the appearance of a Steganopurella 

 to the naked eye. 



Family : MICROPORID^E. 



Stegunoporella buskii, Harmer (17). 



There is a large colony of this species measuring about 10 square centims. It is 

 growing in a loose honeycomb-like form and is of a remarkably light and brittle 

 texture. Another colony, the same in detail, is incrusting a seaweed and is much 

 smaller in every way. 



Locality : Cheval Paar, Gulf of Manaar. 



Steganoporella sulcata, Harmer (17). 

 Locality : Gulf of Manaar. 



Steganoporella simplex, Harmer (17). 

 Localities : Gulf of Manaar ; and oft" Trincomalee. 



Thalamoporella rozieri (Aud.), form indica, Hincks (3). 

 Localities : Gulf of Manaar ; Palk Bay ; and oft Galle. 



Thalamoporella rozieri (Aud.), form falcifera, Hincks (3). 

 Locality : Generally distributed round the Ceylon coast. 



Family: CRIBRILINID.E. 



Cribrilina radiata, Moll. 



Localities : Off* Galle ; Gulf of Manaar ; off Mount Lavinia ; and Station XL. , 

 10 miles off Watering Point, 34 fathoms. 



Family : MICROPORELLID^E. 



Microporella violacea, Johnston, form plagiopora, Busk. 

 Locality : Gulf of Manaar. 



Microporella ciliata (Pallas). 

 Locality : North of Cheval Paar, 7 to 10 fathoms. 



Microporella ciliata, var. personata, Busk (2). 



The avicularia on the Ceylon specimens have wing-like membranous extensions of 

 the sides of the mandible. Two of the colonies are of a pink colour. 



Localities: Gulf of Manaar; and Station XXXIII.. south-east of Ceylon, 

 18 fathoms. 



