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. 
Pulleine, 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 Pfeiffer 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 Limneide. Though not recognizing it as such, he dis- 
tinguished the jaw as a brown, 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, pl. 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. 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 de- 
velopment of G. ancyliformis. 
In Trinidad the genus occurred to Guppy in the form described 
by him (Proce. Sci. Assoc. Trinidad, Dec., 1872) as G. crepidulina, 
and figured Am. Journ. Conch., vi, 1870, pl. 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 Potomae River Stimpson discovered G. 
meekiana, which he figured and described (Proc. Boston Soe. 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 Ameriea,” Pt. ii. 
In California the genus is represented by G. californica Rowell, 
whose description is also reprinted, with additional figures, by Bin- 
ney, from the Proc. Cal. Acad. Nat. Sci., 1863, iii, p. 21. 
