286 CEYLON PEARL OYSTER REPORT. 



Corycaeus ovalis, Claus. 

 Taken at 11 stations in the Mediterranean, Red Sea and northern Indian Ocean. 



Corycaeus obtusus, Dana. 



Corycseus gibbulus, Giesbr. 



Corycaeus longistilis, Dana. 



Similar in range of distribution, occurring from Suez to Ceylon at 47, 41 and 16 

 stations respectively. C longistilis however occurred only once about Ceylon, viz., 

 south of Adam's Bridge, the others being generally represented round the island. 



Corycaeus concinnus, Dana. 



First appeared in the Indian Ocean, where it occurred at 13 stations, and at 5 Ceylon 

 localities. 



Corycaeus gracilicaudatus, Giesbr. 

 Similar in range to C. concinnus, but it first appeared in the Red Sea. 



Corycaeus robustus, Giesbr. 

 Taken once only, in the northern Indian Ocean. 



Corycaeus tenuis, Giesbr. 

 Occurred at 3 stations, viz., in the northern Indian Ocean, off Negombo, and at the 

 Cheval Paar pearl banks. 



Corycaeus longicaudis, Dana. 

 One specimen was found at Muttuvaratu Paar, Ceylon. 



Copilia mirabilis, Dana. 



Found in the Mediterranean, Gulf of Suez, Red Sea, at 6 stations in the Indian 

 Ocean, and once at Ceylon, south-east of Cheval Paar. 



Sapphirina ovatolanceolata, Dana. 



Ten species of the genus Sapphirina occur in the collection, the majority being 

 represented at only 1 or 2 localities. >S'. ovatolanceolata was the most widely distributed, 

 and occurred at 12 stations, extending from the Mediterranean to the Red Sea and 

 Indian Ocean as far as Minikoi. 



Sapphirina gastrica, Giesbr. 



Occurred twice, viz., in the Red Sea, and again from Perim into the Indian Ocean. 



Sapphirina ovalis, Dana. 



One specimen was taken in the Indian Ocean after leaving Perim, and another south 

 of Adam's Bridge, Ceylon. 



