1898.] NATURAL SCIENCES OF PHILADELPHIA. 269 



1850. Gongylostoma Albers, Die Hel., p. 208. Proposed for 

 soiverbyana Pfr., humboldtiana Pfr., rosea Pfr., variegata Pfr., ele- 

 gans Pfr., crispula Pfr., sagraiana Pfr., porrecta Gould, philippiana 

 Pfr. 



From this list of species, von Martens selected elegans as the type, 

 in Die Heliceen, 1860, p. 88. 



1850. Casta Albers, Die Heliceen, p. 208, proposed for elongata 

 Ch. and gracilis Wood, the former selected as type by von Martens, 

 1860. This group is absolutely equivalent to Apoma Beck, 1837. 



1852. Strophina Morch., Catal. Yoldi, p. 35. Proposed for 

 laterradii Grat. only. 



1853. Trachelia Pfr., Monogr. Hel. Viv., Ill, p. 564. Proposed 

 for marmorata Shutt., volubilis Morel., porrecta Gld., gracillima 

 Poey, speluncoz Pfr., subtilis Morel., gouldiana Pfr., rngeli, Shutt., 

 riisei Pfr., cinerea Pfr., morini Morel., philipjriana Pfr., scalarina 

 Shutt. 



These are mainly slender Brachypodella species. Name preoc- 

 cupied by Scopoli in Aves, 1777, by Serv. in Coleoptera, 1834, and 

 by Westwood in Coleoptera, 1839. It is, therefore, rejected from 

 molluscan nomenclature. 



1870. Callonia Crosse & Fischer, Journal de Conch., 1870, p. 

 18. Based upon one species, Cyl. elliotti Poey. 



1380. Epirobia Strebel & Pfeiffer, Beitr. zur Kenntniss der 

 Fauna Mex. Land- und Siisswasser-Conch., Theil IV, pp. 77, 85. 

 Proposed for Cylindrella berendti, polygyra, morini (not of Morelet), 

 apiostoma. 



This is a valid genus, well distinguished by the dentition and 

 hollow axis. 



1891. Dist^ectria Cossmann in Harris and Burrows, Eoc. and 

 Oligoc. Beds Paris Basin, pp. 100, 114. Proposed as a substitute 

 for Cylindrella Pfr., no reason being given for the change. By 

 reference to the list of species originally assigned to Cylindrella, it 

 will be seen that long before the year 1891, every one was amply 

 provided with generic names, Gongylostoma Alb. and Brachypodella 

 Beck including all of them. The name Distwctria, therefore, falls 

 as a synonym. Being of even date with Spartina Harr. & Burr. 

 (q.v.), it might possibly dispute supremacy with that term as a 

 generic name for "Cylindrella " parisientis Desh. ; but it is obvious 

 that that species (which, in our opinion, is not a Cylindrella nor a 

 member of the same family), does not require both a generic and 

 subgeneric name. 



