30 CATALOGUE OF PTEEOPODA. 



Spiratella (limacina), Blainv. Diet. Sci. Nat. xxxii. 284, 1825; 



Man. Malac. 494, 1825 ; Desk. Ency. Meth. iii. 471 ; Sou\ 



Conch. Man. 100, ed. 2, 263. 

 Kronjacht, Oken, Lehrb. Nat. 1817. 

 Argonauta sp., O. Fab. 

 Clio sp., Phipps ; Gmelin, S. N. 

 Heterofusus (retroversus), Fleming, Brit. Anim. 498, 1 833 ; Gray, 



Proc. Zool. Soc. 1848, 149. 

 Peracle (Flemingii), Forbes, Rep. Brit. Ass. 1843, 132, 249. 

 Scaea (retroversus), Philippi, Moll. Sicil. ii. 164, 1844. 

 Helicophora, Gray, Syn. B. M. 1840, 1844, 59. 

 Atalanta (sub-genus Heliconoides). D'Orb. Voy. Ainer. Merid. 



Moll. 174, 184. 

 Spirialis (Les Spiriale), Eydoux ^ Souleyet, Rev. Zool. Soc. 1840 ; 



Cmner, 235 ; Weigm. Arch. 1841, ii. 265 ; Gray, Proc. Zool. Soc. 



1847, 203 ; Loven, Ind. Moll. Scand. 4, 1846 ; Forbes ^ Hanley, 



Brit. Moll. ii. 382. 

 Heliconoides, D'Orb. ; Gray, Proc. Zool. Soc. 1848, 149. 

 Limacina sp., Benson, Jour. Asiat. Soc. Calcut. 1835, 176. 

 Campylonaus, G)'ay, Proc. Zool. Soc. 1848, 149, not Benson. 

 Fusus sp., Fleming, Wern. Trans, iv. 498 ; Brit. Anim. 349. 



Limacina, so well described by O. Fabricius and other arctic 

 zoologists, appears to have been only known to Swedish, Danish 

 and English naturalists. MoUer, who well knew the type, has 

 lately added to the genus a turrited species. These two species are 

 the giants of the genus. The more minute species of the Atlantic 

 and Pacific Oceans have been described as a different genus, under 

 various names, by several authors. D'Orbigny thought Lima- 

 cina {arctica) might be a badly preserved Atlanta {Voy. Amer. 

 Merid. Moll. 75): he first noticed, figured and described the 

 smaller species {Voy. Amer. Merid. t. 12, f. 24), and also first 

 figured the operculum, but he thought some species were without 

 any ; and though he described the colour of the animal, he appears 

 never to have seen them expanded, as he regards the genus as a 

 section of Atlanta, which has a very different kind of animal. I 

 have not been able to find the operculum on our specimens of the 

 arctic species, but they are in a very broken condition. Chemnitz, 

 Fleming and Philippi arranged the more tunited species with or 

 near the Fusi or Pleurotomoe : they differ from the shell of the very 

 young Carinarics Atlanta (see DOrb. Amer. Merid. Moll. t. 11, f. 

 7 — 9) in the shell being reversed. 



Limacina arctica occurs in immense quantities in the North Seas, 

 but rarely out of the sight of land. — Scoresby. 



