4 



THE NAUTILUS. 



G. bakeri Pils., Brazil; hirJdeyi Walker. Guatemala and hjal- 

 marsoni Pfr., Honduras and Texas. 



Sub-genus Kincaidella Hannibal. 

 Apex radially striate. 



Kincaidella Hannibal. Pr. Mai. Soc. London. XIL 1912, 

 p. 143. Type. Ancylus fragili* Tryon — Gundlachia caliiornica 

 Row. 



Caliiornica Rowell, (March. 1863), has priority over fragUis 

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

 w! Sh., II. p. 149), is correct. 



Kincaidella also includes the following species: 



G. beddomei Pett. (MSS.), and petterdi John, from Tasmania; 

 neozilanica Suter from New Zealand: Vhotelleriei "Bgt. ? " Walker 

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

 Africa: californica Rowell, meekiana Stimpson. stirnpsoniana S- 

 Smith and undetermined species from Starved Rock. 111. and 

 Mobile. Ala., from the United States. 



The generic position of Ancylus icoodsi John, from Tasmania 

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

 IX. p. 66), but, if not a Kincaidella. it is a Ferrii-na. 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 Lczvapex. while 

 KincaideUa, like FerrLstia s. s.. has a range extending quite 

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

 of nomenclature could be used, Kincaidella would represent the 

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

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

 genus. 



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

 ancyliformis mentioned by Hedley, (Naut., IX, p. 62). The 

 Tadula? of the three American species that have been figured, 

 cdUfaniica, meekiana and hinkleyi. are all very similar to each 

 other and quite different from that of either Ftrri^sia or Latva- 

 pex. That of G. ncozelanki Suter as figured in T. X. Z.. XXVI, 

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



