DUNDET GASTEROPODA. H 



study of the soft parts, to be the shells of different species. It is 

 their fortunate fine preservation which alone made such a detail 

 analysis possible. The German palaeontologist seems not to have 

 had well-preserved specimens under his hands. 



Out of our total of sixty-six species determined, we take 

 nineteen to have been hitherto unfigured; besides these, the 

 following fifteen do not seem to have been cited before in British 

 lists. 



T^atica Zelima, D'Orb. Littoiina sedilis, Muen. 



Nerinsea bacillus, D'Orb. Pleurotomaria Amyntas, D'Orb. 



Alaria Perrieri, Piette. .. Allica, D'Orb. 



Lorieri, D'Orb. monticulus, Desl. 



Lotharingica, Schlumb reticulata, D'Orb, 



Trochus Zetes, D'Orb. Sauzeana, D'Orb. 



Niortensis, D'Orb Agatha, D'Orb. 



subdecorata, Muen? 



We now add a detail enumeration, with critical notes on some 

 of the species. The number of specimens on which each 

 determination is based has been given. From the scarcity of 

 material, many determinations are open to doubt, and must only 

 be received provisionally. 



The length of the axis of the shell is often given, the breadth 

 being measured along a plane at right angles to this. The angle 

 of the spire is sometimes added, for the sake of comparison with 

 D'Orbigny's descriptions, but it is impossible to take it where the 

 outline is curved — and in most cases it is an uncertain measure- 

 ment. The unit of length used is the millimetre. 



PUEPTJRIKA BELLONA, D'Orbigny. PI. 3, fig. 8. 



1850 Purpurina Bellona, D'Orb. Pal. fr. Terr. Jur. 2 



Oast. pi. 331, figs. 1—3. 

 Syn? 1858 Turbo serratus, Qu. Jura. p. 485, tab. 65, fig. 7. 



1860 Purpurina Orbignyana, Heb. and Desl. Bull. 



Soc. Linn. ;N"orm. V. pi. 1, fig. 6, p. 176. 



