56 STBEPTAXID^E. 



but only as a subdivison of Eustreptaxis, the principal character 

 on which it is founded not being that which, to my sense, is 

 sufficient for the creation of a section, since among the toothed 

 species are some with three denticulations, and others with more. 

 We should take as types of the group : S. dejectus, S. Deplanchei, 

 S. Watsoni and allied species, and exclude a certain number, 

 among which are S. Troberti, Petit, from Guinea, and S. bulbuhts, 

 which can constitute, I think, good sections in the genus. 



" For the reception of Streptaxis Troberti, on account of the 

 characters which follow, I establish a new section, to which I 

 give the name of Lamelliger, distinguished in fact from Odont- 

 artemon by the following peculiarities : 



" The aperture, on its parietal wall, not having in its middle part 

 a tubercular tooth as the great part of Odontartemon, but a 

 strong reflexed lamella, which is prolonged very far into- its inte- 

 rior. The free parietal teeth of this species are two in number, 

 small, and in the case of one almost obsolete. They are situated 

 at the base, near the coluinellar axis. The form of the shell is 

 depressed, and presents the same characters as that of the 

 typical species of Odontartemon. 



" The Ennea bulbulus, Mor., and E. Michaui, Or. and Fischer, 

 which Pfeiffer classed with doubt among the Streptaxis, consti- 

 tute a natural passage to Ennea. These species, concerning the 

 generic position of which there will probably yet for a long time 

 be discussion, but which seem to me for the most part to be 

 Enneas, shortened, globose ovoid, and a little Streptaxiform, 

 caused by the inclination of the axis of the shell, which is, how- 

 ever, more regular than that of many Streptaxis, should, and this 

 for the very uncertainty of their position, form a new group, 

 restricted so far to the island of Puolo-Condor. Besides the 

 peculiar form of the shell, this group, which has the shell of the 

 same nature as that of the true Enneas, finely striate, a spire 

 with quite numerous whorls, not very rapidly increasing, presents 

 a quite peculiar appearance, and the two species, of which one is 

 toothless, the other possessing on the peristome irregularly dis- 

 posed teeth, have between them an air of relationship, by which 

 they may be recognized. I will give to this group, on account 

 of the form of its spire, the name of Oophana." 



