284 CEYLON PEARL OYSTER REPORT. 



Harpa nobilis, RUMPHIUS. Trincomalee. 

 Harpa ventricosa, LAMARCK. N. of Negombo, 9 fathoms. 



FAMILY: MARGINELLID^E. 



Marginella (Cryptospira) angustata, So WERE Y. Pearl banks, Gulf of Manaar ; 

 deep water off Galle ; S. of Adam's Bridge ; Palk Bay ; Chilaw Paar ; S. of Modragam 

 Paar ; Trincomalee ; off Aripu ; off Mutwal Island. 



This species seems to show considerable variation ; in several localities specimens of 

 a very beautiful golden brown colour occur. 



Marginella (Cryptospira) mabellae, MELVILL and STANDEN.* Pearl banks off 

 Manaar ; S. of Adam's Bridge. 



In form this is distinct from any near ally, but most recalls the West Indian 

 M. oblonga, SOWB. It is gracefully oblong, very shining, straw-coloured, with white 

 shining callous deposit over the columellar region and outer lip ; the dorsal margin 

 thick, with straw-coloured callus ; mouth narrow, columella four-plaited. 



FAMILY: OLIVIDM. 



Oliva (Strephona) caroliniana, DUCLOS. Off Galle. 

 Oliva (Strephona) elegans, LAMARCK. Trincomalee. 

 Oliva (Strephona) irisans, LAMARCK. Trincomalee. 



> 



Oliva (Strephona) ispidula, LAMARCK. Trincomalee ; S. of Adam's Bridge. 



Oliva (Strephona) lepida, DUCLOS. Pearl banks off Aripu, Gulf of Manaar ; Galle ; 

 S. of Modragam Paar. Many beautiful colour varieties. 



Oliva (Strephona) polita, MARRATT. Gulf of Manaar. 



Oliva (Strephona) mantichora, DUCLOS. Gulf of Manaar; Modragam Paar. 



Oliva (Strephona) maura, LAMARCK. Trincomalee. 



Oliva (Strephona) pacifica, MARRATT. Pearl banks off Aripu. 

 A dark variety, interesting as being from a new locality. 



Oliva (Strephona) picta, REEVE. Gulf of Manaar ; S. of Modragam Paar. 

 Oliva (Strephona) reticularis, LAMARCK. Pearl banks off Aripu. 

 Oliva (Strephona) tremulina, LAMARCK. Pearl banks off Aripu ; off Galle. 

 * " Moll. Pers. Gulf," ' Proc. Zool. Soc.,' 1901, p. 452, pi. xxiii., tig. 20. 



