204 PERMIAN FOSSILS. 
entire, as in the Whelk, or “canaliculated for the reception of the siphon of the 
branchial cavity,” 1 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. 
Houostomata, Meming. 
ASIPHONOBRANCHES,” De Blainville. 
Diagnosis.—“ Aperture of the shell entire, together with the anterior margin of the 
cloak at the entrance of the branchial cavity.” (Fleming.’) 
Fanily TurRBinip® (Les Turbinacées, partim), Lamarck. 
This group is herein restricted to genera with a perlaceous shell-tissue, and a calca- 
reous operculum. 
Genus Z7urbo, Lamarck, not Linneus. 
The following five species are provisionally placed in the present group; for until 
we 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. 
TROCHILITES HELICINUS, Schl. Petrefactenkunde, p. 161, 1820. 
TROCHILINUS — »,  Boué, Edin. Phil. Journ., vol. xii, p. 144, 1825. 
TROCHILITES — »  Quenstedt, Wiegmann’s Archiv, pl. ii, p. 88, 1835. 
TuRBOo MiNuTUS, Brown. Trans. Manch. Geol. Soc., vol. i, p. 63, pl. vi, figs. 4, 5, 1841. 
— HELIcINUS, Sch/. Leonhard und Bronn’s Jahrbuch, p. 638, 1841. 
— MINuTUS, Brown. Fossil Conchology, p. 74, pl. xxxvii*, figs. 17, 18. 
— Meyer, Minster. Goldfuss’s Petrefacta, 3d Part, p. 92, pl. excii, fig. 14 a, 6. 
— minutus, Brown. Morris, Catalogue, p. 165, 1843. 
— Meyert, Minster. Geinitz, Gea von Sachsen, p. 95, 1843. 
Trocuus HELICINA, Schl. De Verneuil, Bull. Soc. Géol. de France, 2™° série, 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. 
? As terms implying negative characters are decidedly objectionable, Fleming’s name has been preferred. 
3 British Animals, p. 296. 
