370 CEYLON PEARL OYSTER REPORT. 



FAMILY: HALOCYPRLTXE. 



Conchcecia magna, GLAUS. 



Two specimens belonging to this species were taken in the tow-netting collected in 

 the Suez Canal, between Port Said and Suez, on the outward journey. 



Conchcecia clausii, G. O. SARS (?). 



Two specimens apparently belonging to this species occurred in the above collection, 

 but their very poor condition makes their identity uncertain. 



Conchoecetta acuminata, GLAUS. 



One specimen in the above collection, one from near Perim Island in the Red Sea, 

 and a third from the middle of the Indian Ocean. 



Halocypris concha, GLAUS. 



This species occurred in a number of the collections taken between the Mediter- 

 ranean and Ceylon on both journeys, and also on the pearl banks in the Gulf of 

 Manaar. 



SECTION II.: PODOCOPA. 

 FAMILY: CYPRIOTE. 



Macrocypris decora (BEADY). 



In general washings from invertebrata and in washings from sponges dredged in 

 the Gulf of Manaar. 



Macrocypris orientalis, BRADY. 

 In general washings from invertebrata from the Gulf of Manaar. 



Macrocypris similis, BRADY. 

 Also in general washings from invertebrata from the Gulf of Manaar. 



Macrocypris maculata (BRADY). 



In the general washings from the Gulf of Manaar and in washings from Cheval 

 pearl oysters. 



Pontocypris robusta, n. sp. Plate I., figs. 17 and 18. 



Shell seen from the side subtriangular, the height being equal to slightly more 

 than half the length, anterior extremity moderately broad and obliquely rounded, 

 posterior attenuated and almost acuminate ; dorsal margin boldly arched, highest in 

 the middle, sloping with a steep curve backwards, and more gently towards the front ; 

 ventral margin deeply sinuated well in front of the middle. Seen from above the 



