NATICA.— Plate XXI. 



Neriltt sulcata, Boru, Test. Mus. CiEs. Vindobonensis, 



pi. 17. f. 5, 6. 



Nerita cancellata, Graelin. 



Natica cancellata, Lamarck. 



Natica sulcata, Deshayes. 

 Hab. West Indies. 



Tlie only species n^i Natica wliich is absolutely sculptured 

 throughout . 



Species 96. (Mus. Cuming.) 

 Natica Grcenlandica. Nat. testa vix vmbilicatd, glo- 

 liosd, spird snhampld, exsertd, anfractibvs rotmuhtis, 



laviljKS, ojiertiird lunarl-ovatd, colmnelld uiferne cal- 

 loso-rffiexd ; opaco-albd, epidennide virescmte-cinered 

 indutd, versus apicem plus minus erosd. 



The Greenland Natica. Shell scarcely umbilieated, 

 globose, spire rather large, exserted, whorls rounded, 

 smooth, aperture lunar-ovate, columella callously re- 

 flected at the lower part ; opake-white, covered with 

 a greenish - ash epidermis, more or less eroded to- 

 wards the apex. 



Beck, Moller, Ind. Moll. Grccnlandia-, p. 7. 



Hah. Greenland and Norway- 



A light chalk-w'hite species, covered with a peculiar 



livid-ash smooth horny epidermis. 



