GASTROPODA (pULMONATA) . 
Moll, 45 
Helix. South American species : — 
Microphysa incrustata (Poey) : jaw ribbed, radula as in M. ingerselli ; 
Binney, P. Ac. Philad. 1876, p. 187, pi. vi. fig. T. 
Helix ghiesbreghti (Njst) and eximia (Pfr.) ; on their coloration, 
Martens, JB. mal. Ges. iii. p. 260. 
Helix trigonostoma (Pfr.) ; on its systematic position, id. ibid. 
Helix costaricensis (Roth) ; on its variability, id. 1. c. p. 255. 
JEurycanipta hydalgonis, sp. n., = trenquelleonis var. b of Hidalgo ; 
Boring, Bol. Ac. Cordova, ii. p. 310, Sierra Chica, Argentine States ; the 
genital organs are also described. 
Helix. North American species : — 
Helix pulchella (Miill.) found also in Nevada, North America, at an 
elevation of 8000 feet, and lower, probably not introduced ; Hemphill, 
Q. J. Conch. 1876, p. 128. 
Glyptoetoma newberrianum (Binn.) ; genital organs with dart sac or 
prostate gland, Binney, P. Ac. Philad. 1876, p. 190, pi. vi. fig. h. 
Polygyra qwstelliana (Bland), dorfeuilleana (Lea), and avara (Say) ; 
radula, id. 1. c. p. 188, pi. vi. figs, z, u, & Y. 
\Polygyra\ Helix febigeri (Bland) ; Pfeilfer, Novitat. Conch, v. 
pi. cxlii. figs. 20-22. 
Helix monodon (Rackett) ; genitalia with large penis sac, Binney, 
1. c. p. 188, pi. vi. fig. Q. 
Mesodon major (Binney) ; on its localities and genital organs, the 
latter agreeing with those of albilabris (Say), id. 1. c. p. 189, pi. yi. 
fig. F. 
Aglaia fidelis (Gray) ; genital organs, id. 1. c. p. 189, pi. vi. fig. P. 
Arionta mormonum (Pfr.) and sequoiicola (Coop.), genitals, calif orni- 
ensis (Lea), and dupetitliouarsi (Desh.), radula; id. 1. c. pp. 189 & 190, 
p]. vi. figs, s, R, w, & u. 
[^Amphidromus'] Bulimus andamanicus (Thorpe, MS.), Hanley & 
Theobald. Conch. Ind. pt. viii, pi. cxlviii. fig. 10. 
BulimuSy group Borus. The known species are compared and 
arranged according to the sculpture of the first whorls : — 
I. — First whorls granulated with distant riblets : B.popelairianus (Nyot), 
with var. n. thammianiis, pi. cxl. fig. 1, var. dohrnianus, pi. cxxxix. 
fig. 2, and var. connectens, pi. cxxxix. fig. 1. B. maximus (Sow.), 
huascari (Tschudi, = lacunosus of Reeve, nec Orb.) pi. cxli. figs. 3 
& 4, sanctae-crucis (Orb.), lacunosus (Orb.), matthewsi (Orb.) = 
? leucostoma (Sow.), duerfeldti (Bohrn), pi. cxl. figs. 4 & 5, castel- 
naui (Hupe), and granulosus (Rang). 
II. — First whorls plaited; B. valenciennesi (Pfr.), proximus (Sow.), 
cantagallanus (Rang) = accelerans (Martens), pi. cxxxviii. figs. 1 
& 2, intercedc7iSy sp. n., pi. cxli. figs. 1 & 2, Bahia, ovatus (Miill.) 
and bronni (Pfr.). 
III. — First whorls densely ribbed : B. oblongus (Miill.) with B. capil- 
laceus (Pfr.) as var., B. lichtensieini (Albers) and auritus (Sow.). 
