GASTEROPODA. 



129 



Lampania, Gray (batillaria, Cantor). Cerith, zonale. PL VIIL^ lig. 23. 



Shell without varices, canal straight. Chnsan. 



The fossil potamides decussatus, JBrug., of the Pai'is basin, resembles this, 

 section, and retains its spiral red bands. ^ 



Nerinjsa, Defrance. ^ 



Etym., nereis, a sea-nymph. pX 



Ex., N. trachea. Fig. 79. 



Shell elongated, many-whirled, nearly cylindrical ; apertm-e 

 channelled in front ; interior with continuous ridges on the co- 

 lumella and whirls. 



Fossil, 150 sp. Inf. oolite — U. chalk. Brit., France, Ger- 

 many, Spain, and Portugal. They are most abundant, and attain 

 the largest size to the south ; and usually occur in calcarious 

 strata, associated with shallow-water shells. (Sharpe.) 



Sub-genera. 1. Nerincea. Folds simple : 2 — 3 on the co 

 lumella ; 1—2 on the outer wall ; columella solid, or perforated. 

 Above 50 sp. 



2. Nerinella (Sharpe), columella solid ; folds simple ; co- 

 lumeUar, — 1 ; outer wall 1. 



3. Trochalia (Sharpe), columella perforated, with one fold ; 

 outer waU simple, or thickened, or with one fold ; folds simple. 



4. Pti/gmatis (Sharpe), columella solid or perforated, usually 

 with 3 folds ; outer wall with 1 — 3 folds, some of them com- 

 plicated in form. 



79." 



? Fastigiella, 

 Type., F. carinata, Keeve. 



Reev( 



Shell like tm-riteUa ; aperture with a short canal in front (Mus., Cuminsr, 

 and Brit. M.). 



ApoRRHxiis, Aldrovandus. 



Etym., aporrhais (Aristotle) "spout-shell" from aporrheo, to flow away. 



Syn., chenopus Philippi. 



Type, A. pes-pelecani. PI. IV., fig. 7, and fig. 80. 



Shell mth an elongated spire ; whirls numerous, tuberculated ; aperture 

 nan-ovv, with a short canal in front ; outer lip of the adidt expanded and lobed 

 or digitated ; operc. pointed, lamellar. 



Animal with a short broad muzzle ; tentacles cylindrical, bearing the eyes 

 on prominences near their bases, outside ; foot short, angular in front ; 



* Fig. 79. Nerinaea trachea, Desl., partly ground down to shew the form of the 

 interior. Bath oolite, Rauville. Communicated by John Morris, Esq. 



G3 



