126 MANUAL OF THE MOLLUSCA. 





CHEM;NITZIA, D'Orbigny. 



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

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

 chylien- Cabinet," 1780-95. 



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

 Monoptigma, Gray. Amoura, Moller. 



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



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

 aperture simple ; ovate ; peristome incomplete ; operculum horny, sub-spiraL 



Animal, head very short, furnished with a long, retractile proboscis ; ten- 

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

 truncated in front, with a distinct mentum. 



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

 low water to 90 fms. 



Fossil, 180 sp. Permian . Brit., Trance, &c. 



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

 genus. Those of the palaeozoic strata to loxonema. 



Sub-genus. Eulimella, Forbes. E. scillse, 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 ; obscurely marked on one side by a series of periodic mouths, which 

 form prominent ribs, internally; apex acute; aperture oval, pointed above; 

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

 horny, sub-spiral. 



Animal, tentacles subulate, close, with the eyes immersed at their poste- 

 rior bases ; proboscis long, retractile ; foot truncated in front, mentum bi- 

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

 a rudimentary siphonal fold. 



The eulima3 creep with the foot much in advance of the head, which is 

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



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

 water. 



Fossil, 40 sp. Garb. ? . Brit., France, &c. 



Sub-genus. Niso, Risso (=Bonellia, Desh.). N. terebellatus, Lam. sp. 

 Axis perforated. 



Fossil, 3 sp. Eocene . Paris, Distr., 5 sp. China, W. America 

 (Cumin g). 



STYLINA, Fleming. 



Ex., S. astericola. PI. VIII., fig. 15. (Syn. stylifer, Brod.) 



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lerica 



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