THE NAUTILUS. 113 



is certainly distinct from both of his species, and therefore can 

 not be considered in this connection. 



OXYTREMA Raf., Journ. de Physique, etc., vol. 88, 1819, p. 

 423. No species mentioned. Not identifiable. The descrip- 

 tion of aperture suggests Angitrema annigera, but the shape 

 assigned excludes that species, and also To, which has been 

 suggested by Mr. Hannibal. 



CAMPELOMA Raf., loc. cit., p. 423. Monotype C. crassula 

 Raf. This species has been synonymized with Paludina pon- 

 derosa Say, but on wholly insufficient grounds. It is more like 

 P. subsolida Anth. which often has the "summit acute." It is 

 not so in ponderosa. Moreover, subsolida is often sinistral. 

 This condition must be very rare in ponderosa. I have never 

 seen a sinistral one, and none is on record. However, nobody 

 could pretend to identify such a specific description positively. 

 Campeloma becomes a synonym of the earlier Ambloxis. 



OMPHISCOLA Raf., loc. cit. p. 423. No species mentioned. 

 Under Opinion 46 of the International Commission, no type 

 can be selected for this genus, since no species "can be recog- 

 nized from the original generic publication." Beck, 1837, 

 selected Lymnaea glabra (0. Mull), a species outside of Rafi- 

 nesque's assigned territory. Dall (1905) suggests that it may 

 have had Lymnaea reflexa, Say, as a basis, but does not assign 

 that as type. In my opinion, it cannot be positively identified. 



LYMNULA Raf., 1. c., p. 423. New name for "Lymnea Auct." 

 Type therefore L. stagnalis. 



ESPIPHYLLA Raf., Jour, de Physique, vol. 88, 1819, p. 423. 

 Monotype E. nympheola Raf. Probably imaginary, but suggests 

 Succinea slightly. 



LEPTOXIS Raf., loc. cit., p. 424. No species was mentioned 

 by Rafinesque, but the terms of the diagnosis can hardly be 

 applied to anything but Anculosa or Somatogyrus. In his mon- 

 ograph of 1848, Haldeman used Leptoxis in place of Anculosa ; 

 this identification being supported by figures in Rafinesque' s 

 unpublished MS., Conchologia Ohioensis, possessed by him. 



Desiring to retain the name Anculosa, I laid the case before 

 several persons, expert in questions of nomenclature, whose 

 verdict was in favor of Leptoxis. The type of Leptoxis will be 

 Anculosa praerosa Say. 



