46 CEYLON PEARL OYSTER REPORT. 



The others appear to be simply branchial, narrowly oval, without setae. A male 

 pleopod figured shows one of the branches apically divided for a short distance. The 

 smooth inner division is probably the male stilet in preparation. 



The uropods are elongate, the narrowly triangular terminal division being about a 

 quarter as long as the peduncle. Within it is a plate about two-thirds as long and 

 half as broad, with a long seta on its rounded apex. 



The female is brown, with numerous conspicuous white spots, and three dorsal 

 longitudinal dark bands. The males did not exhibit any white spots, and had two 

 dorso-lateral dark bands. 



The length of the female was 6 millims., not including the second antennae which 

 were 275 millims. long. The longest male was 4 millims. From this the detail 

 figures of the male are taken. The male figured measured 2 '5 millims. in length. 

 The sex of the female specimen was beyond question, as it was provided with 

 fourteen large eggs. As to the other much smaller specimens one must speak with 

 more reserve, as they might be young ones of either sex. 



Locality : From pearl oysters, East Cheval Paar. 



The specific name is given out of respect to the assiduous work which 

 Miss Harriet Richardson has devoted to this tribe of the Isopoda. 



Family: IDOTEID^E. 



Idotea, Fabricius. 

 1798, Idotea, Fabricius, ' Supplenientum Ent. Syst.,' p. 302. 



Idotea sp. 



In a tow-net gathering off Marichchukaddi there were two specimens of a young 

 Idotea, 2 millims. long, in which the last pair of peraeopods were not yet visible. 



Family: ASTACILLIILE. 



Astacilla, Cordiner. 



1795, Astacilla, Cordiner, 'Remarkable Ruins . . . and Singular Subjects of Natural History.' 



Section, " AstacillaB," etc. 

 1893, Astacilla, Stebbing, 'History of Crustacea,' p. 370. 

 1897, Astacilla, Sars, ' Crustacea of Norway,' vol. 2, p. 87. 

 1904, Astacilla, Norman, 'Ann. Nat. Hist.,' ser. 7, vol. 14, p. 447. 



Astacilla amblyura, n. sp. Plate XI. (B). 



The head has a minute rostral point and the usual broad lateral lobes in advance of 

 the dark protuberant eyes ; it is rather gibbous between the eyes and apparently has 

 a pair of tubercles wide apart in advance of the hump. The specimen was rather foul 

 with adhesive extraneous matter, by which the excrescences were in part obscured, in 

 part exaggerated, and there was some risk, in clearing away what was adventitious, 



