TURRITELLA. 351 



in a fossil state in the Neocomian formation of Britain, 

 South America, and Australia, and one genus (Proto) is 

 altogether extinct. 



'O^ 



Genus TURRITELLA, Lamarck. 



Shell turreted, subulate, many-whorled, imperforate, 

 whorls rounded, spirally grooved, the suture deep ; aper- 

 ture orbicular, entire in front ; outer lip simple, acute. 



Si/n. Monoceros, Meusch., not Block or Lam. Xy- 

 lohelix, Chem. Terebellum, Brown, not Klein. Turris, 

 Humph., not Bolt. Terebra, Fahr., not Aclans, Epi- 

 tonium. Link., not Bolt. Aculea, Pent/. Turritellus, 

 Mont/. 



Ex. T. communis, Eisso, pi. 38, fig. 1. Operculum, 

 T. terebra, Liimcens, fig. 1, a, \, b. Shell, T. terebra, 

 fi f 1 ^ 



The shells in this genus are spotted and variegated, 

 generally with red brown ; the species inhabit all parts of 

 the world, being, however, most numerous in tropical 

 countries. 



Species of Turritella. 



annulata, Kien. lentiginosa, Eeeve. 



aquila, Adams and Reeve. maculata, Reeve. 



bicingulata, La^n. nivea, Gray. 



cerea, Reeve. polaris, Beck. 



cingulifera, Soiv. punctata, Kien. 



communis, Risso. sanguinea, Reeve. 



cornea, Lam. spectrum. Reeve. 



crocea, Kien. terebra, Linn. 



Eschrichtii, Midd. torulosa, Kieii. 



ferrugiuea, Reeve. ungulina, Linn. 

 flammulata, Kien. 



