CEYLON PEARL OYSTER REPORT, 



OPISTHOBRANCHIA. PI.ATI-: vi 



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t total. Lilt Edi' 



ROBRAKCHUS HORNELLI. 71 sp uYLLAPLYSIA ALBOMACULATA.n.sp 7-10. PLEUROBRANCHUS C1TRINUS 



H.APLYSIELLA Moms.n.sp 12,PHYLLAPLYSlAPELl,UCiDA.n.sp. 13-22, OTJCHIDIUM VERRUCULATUM. Cuv. 



'6.MARSENIA PERSPICUA (Linn.) 



