MOLLUSCA. 49 



10. Tukritella canaliculata. PI. XII. Fig. 11. Turr. testa acuminato-turrita, anfractibus duo- 

 decim, spiraliter acute sex-liratis et striatis, interstitiis striis obliquis eancellatis, liris tenuibus duabus infe- 

 rioribus promiuulis ; sordide alba. 



Hab. China Sea. 



The two lower ridges, more prominent than the rest, form a spiral channel immediately 

 above the suture. 



33. EGLISIA, Gray. 



1. Eglisia tbicarinata. PI. XII. Pig. 8. Egl. testa acute turrita, anfractibus ad octodecim, 

 superjie contractis et decKvibus, deinde tricarinatis, sub lente longitudinaliter creberrime et tenuissime can- 

 cellato-striatis, apertura parva, rotunda; sordide. cinereo-fusca. 



Hab. China Sea. 



The cancellated structure of this species very much resembles that of Eglisia lanceolata. 



34. LITTORINA, Ferussac. 



1. LnroKESA castanea. PI. XI. Pig. 8. Litt. testa ovato-conica, spira breviuscula, apice acuta, 

 anfractibus superue depressis, rotundatis, spiraliter carinatis, columella arcuata, callosa, apertura suborbi- 

 culari; intense castanea. 



Hab. Eastern Seas. 



Veiy near the typical form of the genus, strongly spirally keeled throughout. 



35. MARGARITA, Leach. 



1. Mahgabjta bicaeinata. PI. XL Pig. 11 a, b. Marg. testa depresso-orbiculari, perampliter 

 umbilicata, apice acuta, anfractibus spiraliter bicarinatis, carinis distantibus, interstitiis concavis, spiraliter 

 creberrime lineatis, concentrice striatis; fuscescente ant flavicante, nammulis rubidis varie picta, carinis 

 rabido obhque articulatis, aperturse fauce iridescente. 



Hab. Eastern Seas. 



This very interesting species of Margarita is characterized externally by a certain 

 metallic hue, whilst it is particularly iridescent in the interior. 



36. ROTELLA, Lamarck. 



1. Rotella conica. PL XL Pig. 22 a, b. Rot. testa conoidea, laevigata, obsoleteroncentrice striata ; 

 cupreo-castanea, apicem versus rubescente-purpuiea, Kneis fuscis concentricis undulatis obscure notata. 



Hab. Mouth of the Lundu river, coast of Borneo. 



Notwithstanding that the painting of the Rotella is extremely variable, all that were 

 collected of this species are characterized by the same dark purple-red chestnut. 



o 



