MOLLUSCA. 
221 
13. Orificia org. gen. externa discreta, in fiindo sulci. 
One division only ; Elmmognatha. 
Maxilla postice lamina expansa^ acie medio prodiicta. 
Succiniese. 
In a footnote the following genera are mentioned as forming another 
division, Agnatha (maxilla absent), without doubt belonging to A, viz. Testa- 
cclla, Daudcbardia, Glandina^ Streptaxisj and Cylindrella. The Eeucozonm 
correspond to the group Fruticicola in Albers’s arrangement, or to the genus 
Hygromia in that of Adams ; the Atcpnia} include Discus, Fitz. {Datula, Held, 
Acanthinula, Beck), and Vallonia, Bisso ; in the Xeropliilm, the group so 
named by Held (= Theha, Eisso part., Adams, and called Jacosta by Morch) 
is somewhat singularly united with Helix fruticum ; the Dentatmiim (the 
haine is given by Ad. Schmidt) comprise Tachea — Helicogena (Eisso) and 
Pomatia = Helix (Adams). However, in the principal part of his Synopsis ” 
the author does not adhere to the arrangement proposed by him, but retains 
that which is generally adopted at present, commencing with the shell-less 
snails and ending with the turreted shells. 
Mr. Morse, in the Synopsis of the terrestrial and fluviatile 
Molluscaof the State of Maine, arranges the land-snails in the 
following manner : 
Fam. 1. Limacidje, containing Arioninm and Lhnacince, 
Fam. 2. Philomycidje : Tehcnnopliorus. > 
Fam. 3. IlF.LiciDiE, corresponding to Helix and Vitrina of Hr. Pfeifler. 
Subfam. 1. Helicince: the larger and more elevated species of Helix, 
including H alternata. 
„ 2. Vitrinincc^ Vitrina, Drap., Pfr. 
„ 3. Heliccllince : corresponding to the genera and Ma- 
crocyclis of the second edition of Albers’s ‘ Heliceen.’ 
„ 4. Valloninm : corresponding to the groups Patula, Vallonia, 
and Gastrodonta of the work mentioned. 
„ 6. Punctince. 
Fam. 4. OuTHALiciniE : a combination of the Eecorder’s subfamily Ortha- 
licece with Succmea. 
Subfam. Succininee. 
Fam. 5. PuPADiE : corresponding to the Pupacca of the Eecorder, and 
including Ztm, Pupa, and Vertigo. 
The new generic names proposed by Mr. Morse are, as far as we are aware, 
the following : — 
Anguispira for Helix alternata (Say.) ; Pseudoliyalina for H. minuscula, 
Binney \Micropliysa, Albers] ; Sb iatura for two new species ; Strohila for 
Helix lahyrintliica (Say) ; Helicodiscus for Helix lineata (Say) \^Strohila and 
Helicodiscus= Gastrodonta, Albers] ; Planogyra for a new species, near VaU 
Ionia ; Pimctuni for Helix minutissima (Lea) ; Zoogenetes for Pupa liarpa (Say), 
the name indicating that this is a viviparous species ; PaUifera for Tehejino- 
pliorus dorsalis (Binney). 
