4 'J UK NAl'TILl'S. 



G. bnkcri Pilti. , Brazil; hinUeyi Walker, Guatemala and Aja/- 

 marsoni Pfr., llundunis and Texas. 



.Sub-genus Kincaiddla Hannibal. 



Apex radially striate. 



Kincaiddla Hannibal, Pr. Mai. Soc, London, XII, 1912, 

 p. 143. Type, Ancylus Jraxjili-^ Tryon — Gaadlachia californica 

 Row. 



Californica Rowell, (Marc-b, 1863), has priority over fragilvi 

 Try., (June, 1863), if the date given l)y Binney, (L. and F. 

 W. Sh., II, p. 149), is correct. 



Kincaidclla also includes the following species: 



G. beddoinei Pett. (MSS. ), and pettcrdi John, from Tasmania; 

 neozclanica Suter from New Zealand; V Jiotellcriei "Bgt." Walker 

 from Egypt; a species as yet undescribed from Cape Colony, S. 

 Africa; californica Rowell, nieekiana Stimpson, stimpsoniana S. 

 Smith and undetermined species from Starved Rock, 111. and 

 Mobile, Ala., from the United States. 



The generic position of Ancylus iroodd John, from Tasmania 

 would seem to be somewhat uncertain, (see Hedley, Naut., 

 IX, p. 66), but, if not a Kincaiddla, it is a Ferrissia, as the 

 apex is radially striate. 



It is interesting to notice that Gundlachia s. s. is apparently- 

 restricted to the countries bordering the Gulf of Mexico and 

 seems to be a purely American group, similar to Lcevapex, while 

 Kincaiddla, like Ferrissia s. s., has a range extending quite 

 around the globe. If a natural rather than an artificial system 

 of nomenclature could be used, Kincaiddla would represent the 

 older and really typical group and Gundlachia s. s., as a more 

 recent ofE-shoot from the original race, would become a sub- 

 genus. 



I have not seen Troschel's description of the radula of G. 

 ancyliformis mentioned b}' Hedley, (Naut., IX, p. 62). The 

 radulfe of the three American species that have been figured, 

 californica, nieekiana and hinkleyi, are all very similar to each 

 other and quite different from that of either Ferrissia or Laeva- 

 pex. That of G. ncozdanica Suter as figured in T. N. Z., XXVI, 

 pi. 14, fig. 5 is similar in the small number of cusps on the 



