MODIOLARCIDjE. 



519 



castanea, Dkr. 

 caudigera, Lam. 

 coarctata, Dkr. 

 coralliophaga, Cliem. 

 crenulata, Dkr. 

 crispata, Phil. 

 Cumingiana, Dkr. 

 cylindrica, Krauss. 

 dactylus, Sow. 

 divaricata, Phil. 

 gracilis, Phil. 

 Gruneri, Phil. 

 Hanleyana, Dkr. 

 laevigata, Quoy. 

 lanigera, Dkr. 



lithoglypha, Meusch. 

 nasuta, Phil. 

 nigra, D'Orb. 

 obesa, Phil. 

 opifex, Say. 

 Fhilippiana, Dkr. 

 plumula, Hani. 

 pulex, Lam. 

 rugifera, Dkr. 

 silicula, Lam. 

 straminea, Dkr. 

 teres, Phil. 

 tunicata, Gray. 

 ventrosa, Dkr. 



Sub-gen. leiosolenus, Carpenter. 



The cavity or burrow formed by the animal with the aperture 

 prolonged into a tube, more or less bilobed at the outer end, con- 

 tracted at the junction. 



spatiosa, Cpr. 



Sub-gen. botula, Mtirch. 



Shell sub-rhombic-oblong, sub-cyliudraceous ; anterior ex- 

 tremity much rounded, posterior end very obtuse ; beaks very 

 wide, touching, and sub-terminal. 



arenaria, Meusch. 

 fusca, Gviel. 



splendida, Dkr. 

 vestita, Phil. 



Fam. MODIOLAECID.E. 



Palpi obsolete. Mantle-lobes united ; siphonal aper- 

 tures two, distinct, the interspaces with two rows of cirrhi ; 

 branchial opening large, inferior, with a fringed border ; 



