62 THE NAUTILUS. 



me of the method by which the primary shell is transformed into 

 the adult by presenting me with a series showing the passage from 

 stage to stage collected by him in New Zealand. To Mr. R. H. 

 Pulleiue, of the Adelaide University, who guided me to the spot 

 and procured me several specimens, I am particularly obliged for 

 the pleasure of viewing Gundlachia alive at Henley Beach near 

 Adelaide. 



The genus Gundlachia was instituted by PfeitFer in the Zeits. 

 Malak., vii, 1849, p. 98, for the reception of immature specimens of 

 G. ancyliformis Pfr., sent to him by his correspondent, Dr. J. 

 Gundlach, from Cardenas in Cuba. Troschel supplemented his 

 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 the Limnteidre. Though not recognizing it as such, he dis- 

 tinguished the jaw as a browu, semitransparent arch, convex in 

 front and extending from eye to eye. Further remittances from 

 Gundlach enabled Pfeiffer to describe and figure (op. 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 appearance when 

 alive. From this species Bourguignat carved (Spicil. Malae., 1862, 

 pp. 82-87) a new genus, Poeyin, type P. gundlachioides, and two 

 other species, G. adelosia and G. poeyi ' ; all of which, so Crosse tells 

 us (Journ. de Couch., xxx, 18110, p. 262), are but stages in the de- 

 velopment of G. ancyliformis. 



In Trinidad the genus occurred to (nippy in the form described 

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

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



From Mexico the genus is doubtfully indicated by ( ribbons (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 Rowel], 

 whose description is also reprinted, with additional figures, by Bin- 

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



