382 CEYLON PEARL OYSTER REPORT. 



SECTION III. : PLATYCOPA. 

 FAMILY : GYTHERELLID^E. 



Cytherella ondaatjei, n. sp. Plate II., figs. 33 and 34. 



Shell seen from the side subquadrangular, height rather less than two-thirds of 

 the length ; anterior extremity broadly rounded, posterior obliquely rounded, sloping 

 steeply inwards ; dorsal margin slightly arched, highest behind the middle, ventral 

 deeply sinuated in the middle ; seen from above elongate narrow, widest behind the 

 middle, width equal to one-third of the length ; anterior extremity bluntly rounded, 

 posterior almost truncated, margins much hollowed above the middle ; surface of the 

 shell marked with numerous shining spots, and a conspicuous triangular groove ; 

 covered with fine spinules, anterior extremity and ventral margin finely spinulate ; 

 size, 0'6 millim. 



In a dredging from Karativo Paar. 



Named after Dr. ONDAATJE, a former naturalist and collector in Ceylon. 



Cytherella vraspillaii, n. sp. Plate II., figs. 35 and 36. 



Shell seen from the side subelliptical, height less than two-thirds of the length ; 

 valves unequal, left valve larger than the right ; anterior extremity rounded, 

 posterior rounded and slightly produced in the centre ; dorsal margin slightly arched, 

 highest in the centre ; ventral flattened, slightly sinuated ; seen from above pear 

 shaped, widest behind the middle, width slightly less than two -thirds of the length, 

 obtusely pointed in front, broadly rounded behind, lateral margins boldly convex ; 

 surface of the shell smooth and polished ; size, 0'55 millim. 



In general washings from dredged material from Gulf of Manaar. 



This species is named in honour of Mr. V. VRASPILLAI, the well-known Adigar of 

 Musali, who has rendered able service in connection with the pearl banks for many 

 years. 



