APPENDIX. 



PTEROPODA. 



Genus AGADINA, Gould. 

 (Fam. limacinid^e.) 



Shell colourless, pellucid, planorbular, one side showing five 

 or six whorls, the other a single volution, with a large umbilical 

 pit; aperture oblique, campanulate, and projecting beyond the 

 last whorl like a hood. 



Ex. A. cucullata, Gould, pi. 137, fig. I. Shell, A. cucul- 

 lata, fig. 1, a. 



There is but one species of this genus at present described, 

 which was found floating near an iceberg in 60 S. Lat., and 

 106 20' E. Long. The animal is black, with oval appendages. 



Vol. i. p. 44. Genus SPIRULA. 



The name Ammonia, Breyn, has priority over Spirula, 

 Lamarck, and should be used for this genus, and the de- 

 signation of the family should be altered to Ammoniidm ; the 

 species prototypus, Peron, also should be spirula, Lam. Li- 

 tuina, Link, is a synonym of Ammonia. 



Vol. i. p. 53. Genus PLEUROPUS, Eschscholtz. 



Diacria of Gray (Vol. i. p. 51) is synonymous with this genus. 

 The species will stand as follows. 



Species of Plcuropus. 

 depressus, D'Orb. mucronatus, Quoyand Gaim. 



laevigatas, D'Orb. pellucidus, Eschsch. 



longifilis, Trosch. trispinosus, Lesueur. 



