126 MANUAL OF THE MOLLUSCA. 



Chemnitzia, D'Orbigny. 



Etym., named in honour of Chemnitz, a distinguisLed conchologist of 

 Nuremburg, who published seven volumes in continuation of Mai-tini's " Con- 

 chylien- Cabinet" 1780-95. 



Syn., turbonilla, Risso. Partheniaj Lowe. Pyramis and Jaminea, Br. 

 Monoptigma, Gray. Amom-a, MoUer. 



Type, C. elegantissima. PI. VIII., fig. 13. 



Shell slender, elongated, many-whirled ; whirls plaited ; apex sinistral ; 

 aperture simple ; ovate ; peristome incomplete : operculum homy, sub-spiral. 



Animal, head very short, fm'uished with a long, retractile proboscis ; ten- 

 tacles triaugular ; eyes immersed at the inner angles of the tentacles ; foot 

 truncated in fi-ont, with a distinct mentiim. 



Distr., Brit. (4 sp.), Norway, Medit. Probably world-wide. Range from 

 low water to 90 fins. 



Fossil, 180 sp. Permian — . Brit., France, &c. 



The " melaniffi" of the secondary rocks are provisionally referred to this 

 genus. Those of the palaeozoic strata to loxoneraa. 



Sub-genus. HuUmella, Forbes. E. scilla^, Scacchi. 4 Brit, sp. Shell 

 smooth and polished ; columella simple ; apex sinistral. 



EuLiMA, Risso, 1826. 



Etym., eulimia, ravenous hunger. Syn., pasithea, Lea. 



Type, E. polita. PI. VIII., fig. 14. 



Shell small, white, and polished ; slender, elongated, with numerous level 

 whirls ; obscm-ely marked on one side by a series of periodic mouths, which 

 form prominent ribs internally ; apex acute ; apertm-e oval, pointed above ; 

 outer lip thickened internally ; inner lip reflected over the pillar. Operculum 

 homy, sub-spiral. 



Animal, tentacles subulate, close, with the e}-es immersed at their poste- 

 rior bases ; proboscis long, retractile : foot truncated in fi-ont, mentum bi- 

 lobed ; operc. lobe winged on each side ; branchial plume single ; mantle with 

 a mdimentaiy siphonal fold. 



The eulimsB creep with the foot much in advance of the head, which is 

 usually concealed within the aperture, the tentacles only protruding. (Forbes.) 



Bistr., 15 sp. Brit., Medit., India, Australia, Pacific. In 5 — 90 fms. 

 water. 



Fossil, 40 sp. Carb. ?— . Brit., France, &c. 



Sub-genns. Niso, Risso (=BoneIlia, Desh.). N. terebellatus, Lam. sp. 

 Axis perforated. 



Fossil, 3 sp. Eocene—. Paris. Listr., 5 sp. China, W. America 

 (Cuming). 



Stylina, Fleming. 



Ex., S. astericola. Pi. VIIl., fig. 15. (Sva. stylifer, Brod.) 



