506 ON THE AUSTRALASIAN GUNDLACIIIA, 



friend's description by an account of an animal which had dried 

 in the shell. From the dentition he classed the puzzle, not, as 

 Pfeiffer was inclined to do, with Navicella and Neritina, but with 

 its real kin tlie Lymnaeidae. Though not recognising it as such, 

 he distinguished the jaw as a brown semitransparent arch, convex 

 in front and extending from eye to eye. Further remittances 

 from Gundlach enabled Pfeiifer to describe and figure (ojo. cit. 

 1852, p. 180, pi. I. ff. 1-16) the adult and immature shells and to 

 add some information from the collector of its habits and appear- 

 ance when alive. From this species Bourguignat carved (Spicil. 

 Malac. 1862, pp. 82-87) a new genus, Poeyia, type P. gundlachioides, 

 and two other species, G. adelosia and G. poeyi ; all of which, so 

 Crosse tells us (Journ. de Conch, xxx. 1890, p. 262), are but stages 

 in the development of G. ancyliformis. 



In Trinidad the genus occurred to Guppy in the form described 

 by him (Proc. Sci. Assoc. Trinidad, Dec. 1872) as G. crejndulina^ 

 and figured Am. Journ. Conch, vi. 1870, pi. xvii. fF. 10 and 11. 



From Mexico the genus is doubtfully indicated by Gibbons 

 (Journ. of Conch, iii. p. 267). 



An undetermined species was recorded (Am. Journ. Sci. (3), 

 xxiii. p. 248) by Cook from the State of New York. 



On the banks of the Potomac River Stimpson discovered G. 

 meekiana^ which he figured and described (Proc. Boston Soc. Nat. 

 Hist. 1863, p. 249). This account, the best of the genus that has 

 appeared, was transferred by W. G. Binney to the pages of " The 

 Land and Freshwater Shells of North America," Pt. ii. 



In California the genus is represented by G. californica, Rowell, 

 whose description is also reprinted with additional figures by 

 Binney from the Proc. Cal. Acad. Nat. Sci. 1863, iii. p. 21. 



As a fossil, Gundlachia occurs in S. Carolina in a quaternary 

 marl containing mastodon bones (Cook, I.e.). 



Boettger has ventured to name an immature fossil from the 

 Mayence Basin — G. francofurtana (Fischer's Manuel, p. 505). 



A defective monograph of the genus by Clessin appeared in 

 1882 in the Conchylien Cabinet, Bd. i. Abth. 6, pp. 1-5. 



