374 CEYLON PEARL OYSTER REPORT. 



anterior end, sloping very slightly towards the posterior, ventral margin slightly 

 sinuated in front of the middle ; seen from above ovate, widest in the middle, 

 tapering to the extremities, both of which are acuminate, the posterior much 

 attenuated ; width equal to less than half the length ; shell marked with numerous 

 puncta arranged in fairly regular, slightly curved, longitudinal rows. Size, 0'35 

 millim. 



A single specimen in general washings from dredged invertebrates from Gulf of 

 Manaar. 



Paradoxostoma cingalense, BRADY. 



One or two specimens in general washings from dredged invertebrates from Gulf of 

 Manaar. Off Kalpentyn is the only previous locality given for the species. 



Paradoxostoma attenuatum, n. sp. Plate I., figs. 32 and 33. 



Seen from the side pear-shaped, about two and a half times longer than broad ; 

 anterior extremity very narrow, rounded, posterior broad and truncate, sloping 

 inwards, forming a distinct tooth at the junction with the lower margin ; dorsal 

 margin boldly arched, highest considerably behind the middle, ventral margin sloping 

 outwards from the anterior extremity ; very slightly sinuated, convex at the widest 

 part ; seen from above much compressed, with acute extremities, greatest width in 

 the middle, length four and a half times the width ; shell amber coloured, smooth and 

 transparent; size, - 6 millim. 



In washings from Gulf of Manaar sponges. 



Paradoxostoma stebbingi, n. sp. Plate II. , figs. 1 and 2. 



Shell seen from the side pear-shaped, two and a half times longer than broad ; 

 anterior extremity narrow, obliquely rounded, posterior subacute in the centre ; 

 dorsal margin boldly and evenly arched, highest slightly behind the middle ; ventral 

 margin sinuated near the anterior extremity; seen from above compressed, ovate, 

 widest in the middle, and nearly four times longer than broad, extremities acute ; 

 shell smooth, white and semi-transparent ; size, 0'6 millim. 



In general washings from dredged invertebrates. 



I name this species after the Rev. T. R. R. STEBBING. 



Xestolebris margaritea, BRADY. 



In the general washings, in washings from Cheval pearl oysters and Gulf of Manaar 

 sponges, and in a dredging from Karativo Paar. 



Xestolebris tumefacta, BRADY. 

 In the general washings from Gulf of Manaar. 



Xestolebris aurantia, BAIRD. 

 Also in the general washings. The specimens were first identified as Xestolebris 



