228 



CEYLON PEAEL OYSTER REPORT. 



as it does no less than 283 species, of which 76 are new to science, while at least ten 

 new genera are required. The list of new forms is as follows : 



Ridgewayia ti/piat, n. gen. & sp. 

 Centrqpages tenuiremis, n. sp. 

 C. dorsispinatus, n. sp. 

 l'oniilhi tlamv, var. reyhmira, nov. 

 Labidocera pedinata, n. sp. 

 L. kroyeri, var. stylifera, nov. 

 var. gallensis, nov. 

 Pomtellqpsis herdrnani, n. sp. 

 Smomstes inopinata, n. sp. 

 S. longipes, n. sp. 

 S. curticwudata, n. sp. 

 Tri/aatis initial mi, n. sp. 

 T. donnani, n. sp. 

 T. twynami, n. sp. 

 T. chalmersi, n. sp. 

 Stenht lia brt vicorrris, n. sp. 

 S. gracilicaudata, n. sp. 

 .S 1 . longicornis, n. sp. 

 S. perpleoca, n. sp. 

 & dentipes, n. sp. 

 )S'. minnht. n. sn 



Peltidium ovale, n. sp. 



P. angulation, n. sp. 



P. spedoswm, n. sp. 



P. serratvm, n. sp. 



P. perplexmn, n. sp. 



Porcellidium brevicaudatwm, n. sp. 



P. acuticaiidatiiiii, n. sp. 



P. ravance, n. sp. 



Pseudanthessius maximus, n. sp. 



P. ehelifer, n. sp. 



P. ivncinnus, n. sp. 



Liclwmolgwi gracilis, n. sp. 



P. ieversi, n. sp. 



P lankensis, n. sp. 



P. buddhensis, n. sp. 



P simplex, n. sp. 



L. elegans, n. sp. 



P. robustus, n. sp. 



P ;//;/(?.*, n. sp. 



P. dentipes, n. sp. 



7) . . .7.--.T. 7 . 



P. robusta, n. sp. 

 P. laticaudata, n. sp. 



P. mnula, n. sp. 

 P. platysoma, n. sp. 



^mravuTWftbO utytulLurltts, II. g<^II. OS Sp. 



Cletopontius serratiis, n. gen. & sp. 

 Stsplwpontius typicus, n. gen. & sp. 

 Chondracanthus cynoglottidis, n. sp. 



The large majority of these new species were found in the gatherings from the 

 pearl hanks in the Gulf of Manaar, where Professor Herdman and Mr. Hornell were 

 working for some weeks. The dissection and drawing of so many new forms has 

 involved a vast amount of close labour and diligent research, and Mr. Thompson must 



