IO8 LAND AND FRESH WATER MOLLUSKS 



25, 28, 47, 1805. ROISSY, Moll., v, p. 223, 1805. BOWDICH, Elem. 

 Conch., I, pp. 24, 63, 1822 ; A. fluviatilis selected as type. NILSSON, 

 Hist. Moll. Svecias, p. 83, 1822. LAMARCK, Hist. An. s. Vert., vi, 2, 

 p. 25, 1822. BECK, Ind. Moll., p. 123, 1837 ; A. fluviatilis L., tst sp. 

 HALDEMAN, Mon. Limn., p. 14, 1842. 



Ancyclus SAY, Nicholson's Encycl., 3d ed., 11, p. 14, 1819. 



Ancylastrum (sp.) BOURGUIGNAT, P. Z. S., 1853, p. 79, July, 1854. CLESSIN, 

 Conch. Cab., ed. n, p. 10, 1880; A. fluviatilis selected as type. 

 FISCHER, Man. Conchyl., p. 504, 1883. TRYON, Struct, and Syst. 

 Conch., in, p. 107, 1884 ; not Ancylastrum Bourg., 1853, typical. 



Ansulus sive Ansylus GRAY, in Turton, Man., p. 247, 1840. HERRMANN- 

 SEN, Ind. Gen. Mai., I, p. 52, note 13, 1846. 



Ancyllus GRAELLS, Cat. Moll. Espana, p. 22, 1846 ; err. typ. ? 



> Haldemania CLESSIN, 1880, not of Tryon, 1862. 



Subgenus Acroloxus Beck. 



Acroloxus BECK, Ind. Moll., p. 124, 1837, ist sp. A. radiatus Guilding, 1828, 

 not of Orbigny, 1825 ; also includes A. lacustris (L.) Miiller ; Herrmann- 

 sen, Ind. Gen. Mai., i, p. 16, 1846, selects A. lacustris as type. W. 

 G. BINNEY, Land and Fw. Sh. N. Am., n, p. 147, 1865. 



Acroxus BOURGUIGNAT, J. de Conchyl., iv, p. 169, 1853 ; a modification of 

 Acroloxus Beck. 



Velletia GRAY, in Turton, Man., pp. 66, 230, 250, 1840 ; sole ex. A. lacustris 

 Miiller. HALDEMAN, Mon. Limn., p. 14, 1842. GRAY, P. Z. S., 

 1847, p. 181 ; A. lacustris. BOURGUIGNAT, J. de Conchyl., iv, p. 63, 

 1853 ; P. Z. S., 1853, p. 79, July, 1854. FISCHER, Man., p. 504, 1883. 



Subgenus Ancylastrum Bourguignat. 



Ancylastrum BOURGUIGNAT, Journ. de Conchyl, iv, pp. 63, 170, 1853 (Feb.), 

 A. cumingianus Bourguignat (Tasmania) selected as type ; P. Z. S., 

 1853, p. 91 (not p. 80), 1854. HEDLEY, Proc. Mai. Soc., i, p. 118, 1894. 

 Not Ancylastrum Clessin, 1880, and Westerlund, 1902. 



Cumingia CLESSIN, Conch. Cab., ed. n, pt. 299, Mon. Ancylus, p. 10, 1880; 

 type A. cumingianus Bourg. TRYON, Struct. Syst. Conch., in, p. 107, 

 1884. Not Cumingia Sowerby, P. Z. S., 1833, p. 34. 



Legrandia HANLEY, Proc. Roy. Soc. Tasmania for 1871, p. 27, 1872. Type 

 A. cumingianus Bourg. 



? Subgenus Gundlachia Pfeiffer. 



GunaMchia PFEIFFER, Zeitschr. fur Mai. for 1849, P- 97 J 85o; type G. 



ancyliformis Pfeiffer, Cuba; cf. Nordenskiold, Zool. Anz., xxvi, pp. 590- 



593, July, 1903 ; and Dall, Nautilus, xvn, Jan., 1904, pp. 97-8, 1904 ; 



also J. G. Cooper, Proc. Cal. Acad. Sci., vi, p. 26, 1875. 

 Poeyia BOURGUIGNAT, Spicil. Mai., xciv, Jan., 1862, Rev. de Zool., p. 13, 



1862. Sole ex. P. gundlachioides Bourg., = Gundlachia test. juv. fide 



Fischer. 



The genus Ancylus cannot be cited as of Geoffroy, first, because 

 that author did not adopt the Linnean nomenclature, and secondly, 

 because his only species was identified by him with Patella lacustris 

 L., which is the type of Acroloxus, and, though Bourguignat and 



