LITIIODOMUS.— I'l.ATE IV. 



perpendicithiyili'r corriigatd, anlica svlmcdvatit et ru- 

 gose plmmdatd. 



The bakked Litiiodomus. Shell cyliudrical, posteri- 

 orly rounded, anteriorly slopingly attenuated, poste- 

 rior part perpendicidarly wrinkled, anterior slightly 

 excavated and roughly feathered. 



Ilah. ? 



This little species is sharply attenuated, whilst the in- 

 crustation is roughly wrinkled on the posterior as well as 

 anterior side. 



Species 25. (Mus. Cuming.) 



LiTHouoMUS CANALIFERUS. Litliod. testa cyl'mdraced, 

 postice rotmidaid, antice bi-radiatim excavatd et an- 

 gmte multi-canaliculatd. 



The channelled Lituodomus. Shell cylindrical, pos- 

 teriorly rounded, anteriorly biradiately excavated and 

 narrowly many-clianaelled. 



Hanley, Pro. Zool. Soc. 1844, p. IG. 

 Hab. Island of Zebu, Philippines ; Cuming. 



The calcareous crust in this species takes a very charne- 

 teristic form, being rayed on the anterior slope in deep 

 narrow ciiannels. 



Pig. 26. (Mus. Cuming.) 



LiTHODOMUS SUBULA. Litliod. testd elongatd, postice glo- 

 bosd, antice subacute attenuatd, parte posticd lavigatd, 

 anticd anguste canaliculatd et riigoso-plumulatd. 



The awl Lithodomxjs. Shell elongated, posteriorly 

 globose, anteriorly rather sharply attenuated, poste- 

 rior part smooth, anterior narrowly channelled aud 

 roughly feathered. 



ffa/,, ■? 



Allied to L. plumula, but more sharply attenuated, and 

 more narrowly channelled along the edge of the anterior 

 slope. 



