2<J8 CEYLON PEARL OYSTER REPORT. 



proved to be on the Indian coasts generally. The chief rarity worthy of note is 

 Mitra tankei'villei, hitherto a unique shell of unknown locality. 



In the Catalogue we have quoted localities only, as found in the various jars and 

 l>ottles, or as furnished by Professor HERDMAN. Particulars as to nature of bottom, 

 and conditions under which the specimens were obtained, are so fully given under the 

 several headings in the " Narrative" itself (Part I., p. 17) that we do not consider it 

 necessary to repeat them. 



We must thank Professor HERDMAN for the care bestowed in the collection and 

 preservation of his specimens, and for his help in the general assortment of the 

 material. Also we must record our deep indebtedness to Mr. EDGAR A. SMITH, 

 F.Z.S., Mr. J. COSMO MELVILL, M.A., F.L.S., F.Z.S., and Mr. J. M. WILLIAMS and 

 Mr. W. J. HALLS for much valuable assistance and for advice in the case of certain 

 critical species. 



In the classification adopted, we have followed the general sequence proposed by 

 P. PELSENEER in his 'Introduction a 1'etude des Mollusques' (1892), and have also 

 referred often to P. FISCHER'S 'Manuel de Conchy liologie ' (1887). For the characters 

 of the species we have, to a certain extent, followed TRYON'S ' Manual of Mollusca,' at 

 the same time allowing our own views fair latitude. We have considered it quite 

 unnecessary in this instance to burden the Catalogue with the synonymy of each 

 species, but have endeavoured in every case to give the name sanctioned by the laws 

 of priority. 



CATALOGUE OF SPECIES. 



CLASS: CEPHALOPODA. 



(In addition to the species of Cephalopoda recorded by Dr. HOYLE in his report, 

 Part II., p. 185, the shell of Spirula peroni, LAMARCK, was obtained at Watering 

 Point, Galle, and at Trincomalee.) 



CLASS: GASTROPODA. 

 ORDER : PROSOBRANCHIATA. 



FAMILY: PATELLID^. 

 Helcioniscus testudinarius (LiNN.). S. of Modragam Paar. 



FAMILY: FISSURELLID^. 



Fissurella tenuistriata, SOWERBY. S. of Modragam Paar. 

 Olyphis salebrosa, REEVE. Trincomalee. 



