ARGONAUTA. 335 



more distant than in either of the others, and are alternately 

 shorter, by which as well as by its browner colour, this spe- 

 cies may be readily known. I suspect that Favanne's des- 

 cription of ' Le Croisant,' (Vol. 1. p. 712. t. 7- f. A 1.) is 

 taken wholly from Lister, t. 555. f. 6. which may be a bad 

 representation of the present species, though his having 

 marked it to be a native of England creates a suspicion that 

 it may be a magnified figure of some of our numerous mi- 

 nute shells. Favanne's ' Petit Nautile a grosses cote's, t. 7. 

 f. A 5. which he describes to be less than an inch long, and 

 of a tawny brown colour, may probably be the young of this 

 species. 



gondola. 4. Shell with its keel edged with com- 

 pressed teeth; lateral ribs numerous and 

 branched ; aperture broad ovate. 



Argonauta Argo, Var. e. Gmelin, p. 3368. 



Argonauta Navicula. Solander's MSS. Portland Cat. 



p. 44. lot 1055. ? 

 Le Nautile a Oreilles. Favanne, i. p. 715. t. 7. f. A 7. 

 Argenville, t. 5. f. C. Martini, i. t. 18. f. 160. 



Inhabits the coasts of Mozambique, and the Isle of France. 

 Favanne. 



Shell of about the same size as A. tuber culata, but the keel is 

 not concave, and differs in having the teeth on its edge 

 placed further apart, and of a more compressed and less 

 conical shape; the sides are more convex, and the lateral 

 ridges only very slightly tubercular ; the aperture is much 

 broader, and the corners next the spire are drawn out into 

 two more or less recurved horn-like appendages. I suspect, 

 however, that these appendages are only to be found in old 

 shells, for I have a specimen without them which otherwise 

 answers to Favanne's description ; and A. Navicula of So- 

 lander, Lister, t. 554. f. 5. Rumphius, t. 18. f. 4, and 

 Petiver Amb. t. 22. f. 10. may probably be the same species 

 in an earlier stage of growth. 



haustrum. 5. Shell with the keel edged with com- 

 pressed teeth ; lateral ridges smooth and sim- 

 ple ; aperture sub-triangular. 



Argonauta Argo, Var. (. Gmelin, p. 3368. 

 U Ecope de Batalier. Favanne, i. p. 71 6. t. 7. f. A 3. 

 Seba, iii. t. 84. f. 8. Martini, i. p. 238. and Vignette, 

 at p. 221. fig. 2. 



