110 CEYLON PEARL OYSTER REPORT. 



Nellia oculata, Busk (2). 

 Locality : Gulf of Manaar. 



Family : TUBUCELLARILLm 



Tubucellaria cereoides (Ellis and Sol.). 



Localities : Off Galle and onwards up the West Coast of Ceylon, deep water ; 

 Navakaddu Paar, Gulf of Manaar (several colonies). 



Family : MEMBRANIPORIDiE. 



Membranipora favus, Hincks (8). 



There are tubercles between some of the zocecia in the colonies of this species which 

 otherwise agree with Hincks's description of the species. 

 Locality : Gulf of Manaar (on Conus shells). 



Membranipora irregularis, D'Orbigny. 

 Locality : Gulf of Manaar. 



Membranipora hastilis, Kirkpatrick (21). 

 Locality : Gulf of Manaar. 



Amphiblestrum cervicorne, Busk (2). 

 Locality : Off Manaar Island (several colonies). 



Amphiblestrum papillatum, Busk (1). 



Localities: Station XLVL, off Mount Lavinia, 25 to 30 fathoms; Navakaddu 

 Paar, Gulf of Manaar. 



Amphiblestrum granuliferum (Hincks, 3). 

 Localities : Gulf of Manaar ; oft* Galle ; and oft" Mount Lavinia (several colonies). 



Amphiblestrum marginella (Hincks, 8). 



The lateral avicularia of these specimens are more pointed than in Hincks's 

 description, and are directed upwards instead of downwards. The large avicularia 

 occupying a whole zocecial area are present. 



Locality : Gulf of Manaar. 



Amphiblestrum delicatulum (Busk). 



The Ceylon specimens show the serrated denticle of this form and have no avicularia. 

 The zocecia are not quadrangular but of a diamond shape, resembling one of the zocecia 

 in Hincks's figure (3, plate xi.) of this species. There are no knobs such as Hincks 

 describes on his specimens. Ocecia are present, not described before ; they are sunk 



