82 ZOOLOGY OF THE VOYAGE OP H.M.S. SAMAEANG. 



Several examples of this small species were collected at various localities in the Eastern 

 Seas. 



2. Ceassatella picta. PI. XXIII. Kg. 6. Cras. testa trigono-ovata, crassa, gibbosa, concentrice 

 rude plicata, plicis crassis rotundatis, virescente-alba, radiis aat maculis duabus rufo-castaneis conspicue picta. 



Hab. Philippine Archipelago. 



A stout solid shell characterized by two blotched red-chestnut rays on each valve. 



3. Ceassatella coeeugata. PL XXIII. Fig. 7. Cras. testa subtriangulari, crassa, gibbosa, antice 

 declivi, rotundata, postice angulata, rubro-eastanea, obscure radiata, concentrice peculiariter undato- plicata, 

 plicis corrugatis. 



Hab. Sooloo Sea. 



Very distinctly characterized by the waved corrugated folds with which it is sculptured. 



4. Ceassatella pallida. PI. XXIII. Pig. 9. Cras. testa oblonga, subtrigona, crassa, latere postico 

 ruultb longiore, obtuse angulata, antico brevi, concentrice profunde sulcata, sordide alba, umbonibus rufes- 

 centibus. 



Hab. China Sea. 



The absence of dark colouring is very unusual in this genus. 



5. Ceassatella compeessa. PL XXIII. Fig. 10. Cras. testa oblongo-ovali, valde compressa, latere 

 antico rotundato, postico vix angulato, castaneo-brunnea, concentrice phcato-sulcata. 



Hab. Corean Archipelago. 

 Remarkably compressed, with very simple sculpture. 



9. MYARIA. 



91. MY A, Linnmus. 



1. Mya Mindoeensis. PL XXHI, Fig. 13. M. testa ovato-oblonga, subcompressa, alba, epider- 

 mide subfusca partim induta, latere antico rotundato, postico subtruncato. 



Hab. Mindoro Sea. 



This little shell appears to be a true adult Mya, though apparently young. 



92. THRACIA, Leach. 



1. Theacia geanulosa. PL XXHI. Fig. 16. Thr. testa ovato-oblonga, subsequilatera, alba, undique 

 minute grauulata, transversim oblique plicata, plicis grandibus undulatis, ad latus posticum valvse superioris 

 obsoletis, latere postico subtruncato. 



Hab. China Sea. 



An extremely interesting addition to this very limited genus. 



