132 MANUAL OF THE MOLLUSCA. 



kemimltra rehisa, Sw., and several others), referred to this genus, have a 

 concentric operculum, like imluclina. 



Melanopsis, Lam. 



Types, M. buccinoides, M. costata. PL VIII., fig. 30. 



Shell ; body-whirl elongated ; spire short and pointed ; aperture distinctly 

 notched in front ; inner lip callous y operculum sub-spiral. 



Distr., 20 sp. Spain, Asia Minor, New Zealand, 



Fossil, 25 sp. Eocene — . Europe. 



Sub-genus. Pirena, Lam. (faunus, Montf.) P. atra. PI. VIII., fig. 31. 

 Spire elongated, many whirled ; outer lip of the adult produced, 



Distr., 4 sp. ? S. Afi'ica, Madagascar, Ceylon, Philippines. 



FAMILY V, TURRITELLID^. 



Shell tubular, or spiral ; upper part partitioned off ; aperture simple ; 

 operculum horny, many-whirled. 



Animal with a short muzzle ; eyes immersed, at the outer bases of the 

 tentacles ; mantle-margin fringed ; foot very short ; branchial plume single ; 

 tongue araied, 



TuKRiTELLA, Lam, 



Etym., diminutive of turris, a tower. 



Syn., terebellf!m, torcula, zaria and egHsia, Gray, 



Type, T. imbricata. PI. IX., fig. 1. 



Shell elongated, many-whirled, spirally striated ; apertm'e rounded, mar- 

 gin thin ; operculimi horny, many-whirled ; with a fimbriated margin. 



Animal with long, subidate tentacles ; eyes slightly prominent ; foot 

 truncated in front, rounded behind, grooved beneath ; branchial plume very 

 long ; lingual ribbon minute ; median teeth hooked, denticulated ; uncini 3, 

 serrulated. Carnivorous ? 



Distr., 50 sp. AYorld-mde. Ranging from the Laminarian Zone to 100 

 fms. W. Indies, U, States, Brit. (I sp.), Iceland, Medit., W, Africa, China, 

 Australia, W. America. 



Fossil, 170 sp., Neocomian — . Brit. &c., S, America, Australia. 



Sub-genera. Froto, Defr., P. cathedraHs, PI. IX., fig, 8, apei-tiire trun- 

 cated below\ 



Mesalia, Gray, M. sulcata (var.) PL IX., fig. 2. Greenland— S, Africa. 



Fossil, Eocene, Brit., France. 



? AcLis, Loven. 

 Etym., A, without, hleis, a projection. 

 Syn., alvania, Leach (not Risso). 

 Type, A. perforatus, Mont. PL IX., fig. 4. 



Shell minute, like turritella ; spirally striated ; aperture oval ; outer lip 

 prominent .; axis slightly rimate j operculate. 



