220 
ZOOLOGICAL LITERATURE. 
teropodes androgynes, comme les Helix par exemple, ne se fecon- 
dent pas mutuellement. Dans Facte de Faccouplement, une 
Helice joue tantot le role de male, tantot celiii de feinelle.^^ 
After copulation, the genital organs show a difference in appear- 
ance, dependent on the circumstance of whether the snail has 
acted as male or female. The sayitta amatoria of the individual 
acting as female, is said to have the function of arresting the 
penis of the male, so that it does not penetrate too deeply. A 
more elaborate paper on this subject is promised by the author 
under the title Etudes anatomo-physiologiques sur les Mollus- 
ques,^^ 4to, with coloured plates ; but we are not aware that it 
has been published. The statements made by the author in the 
memoir quoted above, appear to us to be too general and theo- 
retical to be convincing. 
Hr. Lehmann has published a paper entitled Beschreibung 
einiger Schneckenthiere,'^ in Pfeilf. Mul. Blatt. 18G t, pp. 14-53, 
with one plate. He describes the external soft parts and the 
anatomy of the following species: — Helix thyroides (Say), H. 
albolabris (Say), Bulhnus {Limicolaria) adansonii (Pfr.), and 
Bulimus undatus (Brug.),^^ the latter from Costa Rica. The 
systematic position generally assigned to these shells is confirmed 
by the examination of the maxilla : viz., that the first two are 
true Helices, the third belongs to the subfamily including the 
African Achatince and the large American Bulimi, and that Bulu 
mus undatus, or better Orthalicus, is distinguished by a maxilla 
composed of seven pieces. 
Also M. Stabile in the memoir on the Mollusks of Piedmont, 
which we have quoted above, has given some very remarkable 
observations on the maxillae and tongue of these mollusks. The 
systematic arrangement which he has based on the former nearly 
coincides with that proposed by Morch. Several remarks on 
some exotic genera of Land-snails (Tennentia, Parmarion, Heli- 
carion, Camptonyx) are added. 
Hr. Morch, who had given in the ^ Malakozoologische Blatter ^ 
of the year 1859 an arrangement of the Helicidae based upon the 
maxillae, modifies it in the ^ Synopsis Molluscorum terrestrium 
et fluviatilium Daniae,^ P-5, thus : — 
A. Orificium organorum generationis commune. 
Oxygnatha. 
Aulacognalha. 
Odontognatha. 
Maxilla costata, acie 
dentata. 
Maxilla licvis, acie 
Maxilla sulcata, acie 
simplice. 
Limaces. 
Vitrineae. 
Zonitidae. 
crenulata. 
Aiionidae. 
Leucozonae, 
Ataeniac. 
Xerophilae. 
Ariantidae. 
Peiitataeniae. 
Clausilieao. 
Caecilioides, 
Biilimi. 
