36 



CEYLON PEARL OYSTER REPORT. 



15<| 



' Central lobe with the flanking apices 



bifid. 

 12<^ 



Central lobe with the flanking apices 



simple. 



f Apical sinus in male simple 14. 

 1_ Apical sinus in male sculptured 17. 



r Apical sinus visible from above 15. 

 \ Apical sinus dorsally concealed 16. 



Movable ramus of uropods in male 



stiliform. 

 Movable ramus of uropods in male 

 uncinate. 

 f Apical sinus concealed by a trilobed 

 J process. 



Apical sinus concealed by a simple 

 ^ acute process. 



'Apical sinus with two teeth in the 

 border. 

 Apical sinus with four teeth in the 



border. 

 Apical sinus with six teeth in the 

 border 18. 

 f Teeth in the sinus boldly cut. 

 |_ Teeth in the sinus minute. 



12. C. granulosa, H. Richardson, 1899. 



13. C. li7iguicauda,IL. Rtchardson, 1901. 



17^ 



14. C. stylifera, Whitelegge, 1902. 



15. C. carinata, H. Richardson, 1900. 



16. C. curtispina, Haswell, 1882. 



17. C. ornata, Whitelegge, 1902. 



18. C. beddardi, n. sp., 1905. 



19. C. caudata (Say), 1818. 



20. C. tuberculosa (H. Richardson), 1899. 



21. C. gilliana, H. Richardson, 1899. 



In regard to this list it should be mentioned that Miers treats Haswell's 

 C. crassicaudata and his own C. longispina as two varieties of C. latreittii. The 

 specific name of C. antennalis he adopts from White, who published it in 1847 

 without a description. The species described by G. M. Thomson, in 1879, as Nesea 

 caniculata was recorded by Thomson and Chilton, in 1886, as Ncesa canalicidata, 

 with a notice that Miers supposed it to belong to Cilicaea, and that the type specimen 

 had apparently been lost. Miss Richardson's C. gilliana was described by her 

 under the name C. caudata gilliana, as a new sub-species of C. caudata (Say). 

 Species that may belong to the genus, but which have as yet only been described in 

 the female form, are not included in the list. 



Cilicsea latreillii, Leach Plates III. (B), VIII. 



1818, Cilicaea latreillii, Leach, 'Diet. Sci. Nat.,' vol. 12, p. 342. 



1825, Cilicsea latreillii, Desmarest, 'Consid. g&i. Crust.,' p. 296, pi. 48, fig. 3. 



1836, Cilicaea latreillii, Guerin, ' Iconogr. Regne Animal,' pi. 30, fig, 4 (by error marked 



2 on plate ; see explanation of plates, p. 32, second edition). 

 1840, Nffisea latreillii, Milne-Edwards, 'Hist. Nat. Crust.,' vol. 3, p. 218. 



