372 CEYLON PEAEL OYSTER REPORT. 



a half times the width, right valve smaller than the left ; shell white, smooth, and 

 polished ; size, 0'97 millim. 



In general washings and in washings from Gulf of Manaar sponges. 



Erythrocypris herdmani, n. sp. Plate L, figs. 15 and 16. 



Shell seen from the side subtriangular, the height being about equal to half of the 

 length ; anterior extremity broadly rounded, posterior attenuated and subacumiuate ; 

 dorsal margin strongly arched, almost angular at its highest point, forming a distinct 

 hump, greatest height considerably in front of the middle, and sloping with a steep 

 curve to both extremities, ventral margin slightly sinuated ; seen from above ovate, 

 width fully two-fifths of the length, greatest width about one-third from the anterior 

 extremity, extremities obtusely pointed, rather more acute in front than behind ; 

 valves yellowish, smooth, and shining, covered with numerous short rigid hairs, the 

 left valve has a distinct tooth at its posterior end ; size, 0'85 millim. 



Specimens were found in general washings from Gulf of Manaar, in washings from 

 Cheval pearl oysters, and Manaar sponges, and on Karativo Paar. This species, 

 which is easily distinguished from any of those already described, is named in 

 compliment to Professor HERDMAN, whose labours on the Ceylon pearl banks have 

 added an extensive chapter to our knowledge of the tropical marine fauna. 



Bairdia villosa, BRADY. 

 In general washings from invertebrates from the Gulf of Manaar. 



Bairdia attenuata, BRADY. 

 In general washings from invertebrates from the Gulf of Manaar. 



Bairdia woodwardiana, BRADY. 

 In general washings from invertebrates from the Gulf of Manaar. 



Bairdia amygdaloides, BRADY. 

 In general washings from invertebrates from the Gulf of Manaar. 



Bairdia faveolata, BRADY. 

 In the general washings and in washings from Cheval pearl oysters. 



Bairdia hirsuta, BRADY. 



In general washings, in washings from Cheval pearl oysters, and from Karativo 

 Paar. 



All these species of Bairdia are new to the fauna of Ceylon. 



Bairdia inornata, n. sp. Plate I., figs. 11 and 12. 

 Shell seen from the side subreniform, height equal to more than half the length ; 



