204 PERMIAN FOSSILS. 



entire, as in the Whelk, or " canahculated for the reception of the siphon of the 

 branchial cavity," ^ as in the Spindle-shell. No examples of the last division have yet 

 been found in deposits of the Permian epoch ; and it is doubtful whether any were 

 created until a later period. 



HoLOSTOMATA, Fleming. 

 AsiPH0N0BRANCHEs,2 J)e BlainvUle. 



Diagnosis. — " Aperture of the shell entire, together with the anterior margin of the 

 cloak at the entrance of the branchial cavity." (Fleming.^) 



Family Turbinid^ [Les Turbinacees, partim), Lamarck. 



This group is herein restricted to genera with a perlaceous shell-tissue, and a calca- 

 reous operculum. 



Genus Turbo, Lamarck, not Linnaeus. 



The following five species are provisionally placed in the present group ; for until 

 Ave know the character of their operculum, and whether they were perlaceous or non- 

 perlaceous, it is impossible to form any conclusion as to their proper generic position. 



Turbo helicinus, Schlotheim. Plate XVI, figs. 21, 22. 



TftocHiLiTES HELICINUS, Schl. Petrefactenkunde, p. 161, 1820. 

 Trochilinus — ,, Bou6, Edin. Phil. Journ., vol. xii, p. 144, 1825. 



Tbochilites — ,, Quenstedt, Wiegmann's Archiv, pi. ii, p. 88, 1835, 



Turbo minutus. Brown. Trans. Manch. Geol. Soc, vol. i, p. 63, pi. vi, figs. 4, 5, 1841. 



— helicinus, Schl. Leonhard und Bronn's Jahrbuch, p. 638, 1841. 



— MINUTUS, Brown. Fossil Conchology, p. 74, pi. xxxvii*, figs. 17, 18. 



— Meyeri, Miinster. Goldfuss's Petrefacta, 3d Part, p. 92, pi. cxcii, fig. 14 a, b. 



— MINUTUS, Brown. Morris, Catalogue, p. 165, 1843. 



— Meyeri, Miinster. Geinitz, Gsea von Sachsen, p. 95, 1843. 



Trochus helicina, Schl. De Verneuil, Bull. Soc. Geol. de France, 2°" serie, vol. i, 



p. 35, 1844. 

 Turbo minutus. Brown. Loc. cit. 



— — „ Geol. Russ., vol. i, p. 225, 1845. 

 Trochus helicina, Schl. Loc. cit. 



1 Op. cit. p. 296. 



2 As terms implying negative characters are decidedly objectionable, Fleming's name has been preferred. 

 ' British Animals, p. 296. 



