284 CEYLON PEARL OYSTER REPORT. 



Harpa nobilis, Pumphius. Trincomalee. 

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



Family: MARGINELLID^E. 



Marginella (Cryptospira) angustata, Sowerby. 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. 



Oliva 

 Oliva 

 Oliva 

 Oliva 



Oliva 



S. of Modr 



Oliva 

 Oliva 

 Oliva 

 Oliva 



Family: OLIVIDM. 



Strephona) caroliniana, Duclos. Off Galle. 



Strephona) elegans, Lamarck. Trincomalee. 



Strephona) irisans, Lamarck. Trincomalee. 



Strephona) ispidula, Lamarck. Trincomalee ; S. of Adam's Bridge. 



Strephona) lepida, Duclos. Pearl banks off Aripu, Gulf of Manaar ; Galle ; 

 again Paar. Many beautiful colour varieties. 



Strephona) polita, Marratt. Gulf of Manaar. 



Strephona) mantichora, Duclos. Gulf of Manaar ; Modragam Paar. 



Strephona) maura, Lamarck. Trincomalee. 



Oliva 

 Oliva 

 Oliva 



Strephona) pacifica, Marratt. Pearl banks off Aripu. 



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



Strephona) picta, Reeve. Gulf of Manaar ; S. of Modragam Paar. 

 Strephona) reticularis, Lamarck. Pearl banks off Aripu. 

 Strephona) tremulina, Lamarck. Pearl banks off Aripu; off Galle. 

 * " Mull. Purs. Gulf," ' Proc. Zoul. Sou.,' 1901, p. 452, pi. xxiii., tig. 20. 



