ODONTOGNATHA, AULACOGNATHA. 153 
Helix (^Xanthomelori) lyndij sp. n., Angas, P. Z. S. 1872, p. 610, Port 
Essington. 
II. (^Galaxiai) liverpoolensis, sp. n., Brazier, ihid. p. 618, Liverpool range, 
New South Wales. 
H. {Helicostyla) croftoni, sp. n., Cox, ibid. p. 18, pi. 4. fig. 1, Queensland. 
H. {Geotrochus) leucophcea, sp. n., id. ihid, p. 20, pi. 4. fig. 5, Guadalcanar, 
Solomon Islands. 
H. ( G.) brodieif choiseulensis, and mendoza^ spp. nn., Brazier, ibid, pp. 20 & 
21, pi. 4. figs. G-8, Solomon Islands. 
II. (G.) philo7nela, sp. n., Angas, p. 610, Solomon Islands. 
Geotrochus fergusonij sp. n., H. Adams, ihid. p. 614, New Britain. 
Helix {Geotrochus) Im-mione (Angas, 18G9) = 2>^oc7^e<^wa (Crosse, 1870), 
adonis (Angas, 18G0) =smetula (Crosse, 1870), Brazier, ibid. p. 805, I. Bou- 
gainville, Solomon group. 
H. (3Ierope) novcehollandice (Gray, 1834) = dupuyana (Pfr., 1852) : id, 
ibid, p. 805. 
Helix. American species ; — 
Helix poly gyrella (Bland), and obstricta (Say), 
(Gould), 2 Ci\Afidelis (Gray). Jaw described by Bland & Binney, 
P. Pliilad. Ac. 1872, p. 136. H, thyroides climbs on fruit-trees, 
iid, ibid, p. 137. 
Helix (Dentellaria) perplex a {F GY.), Jaw rather smooth, with 
median projection ; marginal teeth quadrate. lid, Ann. Lyc. N. 
York, X. p. 221. 
The Mexican and Central- American species of Helix are thus arranged hy 
Fischer & Crosse (Moll. ten*, ot fluv. du Mexiqiie, pp. 204-299) : — 
Sect 1. Microphysa (Albers) : Helix berendti (Pfr.), p. 226, pi. 10. fig, 6, 
Vera Cruz. 
Sect. 2. Patula (Held) : H. ampla (Pfr.), punctum (Morelet), p. 228, pi. 12. 
fig. 1, Yucatan ; turbinella (Morelet), p. 229, pi. 12. fig. 2, Guatemala ; impura 
(Pfr.) ; wilhelmi (Pfr.), p- 230, pi. 10. fig. 5 j ahnontcana (‘^ ahnontCj'^ Tristram), 
Guatemala; mazatlanica (Pfr.), Mazatlan and S. Francisco; conspurcatclla 
(Morelet), p. 232, pi. 12. fig. 3, Yucatan; (Pfr.), p. 233, pi. 10. fig. 4, 
Vera Cruz; conctilwta (Fdr.), p, 234, with varr. II. cordovana (Pfr.), pi. 12. 
fig. 4, and suturalis (Pfr.), Mexico, Guatemala, Honduras ; pressula (Morelet), 
p. 236, pi. 12. fig. 6, Guatemala. 
Sect. 3. Discus (Albers) : H. oajacensis (Koch), p. 237. 
Sect. 4. Leptaxis (Lowe) : H. mexicana (Koch), Mexico ?, p. 238. 
Sect. 5. Gonostoma (Held) : H. sigmoides (Morelet), Vera Paz, Guatemala, 
p. 239, pi. 12. fig. 6. 
Sect. 6. Pomatia (Beck) : H, Immiholdtiana (Val.) and var. H. buffoniana 
(Pfr.), p. 240, pi. 11. fig. 1. 
Sect. 7. Odontura (new). Shell narrowly umbilicate, depressed-globular, 
granulate or hairy ; peristome reflected. Jaw with numerous longitudinal 
ribs and close transverse striae ; median tooth of radula small ; a long flagel- 
lum ; two dart-sacs ; three mucous vesicles ; hinder part of foot with a me- 
