160 
MOLLUSCA. 
Gihhulina modiolus (T<5r.)> radula examined. 0. Semper, Nachr. mal. Ges. 
ii. p. 103. 
Gtbhus {GihhuUnd) hourguignaii (Desh.), from Bourbon, rather too near to 
G. hacillus (Pfr.), from Mauritius ; also G. mtersecta (Desh.) very doubtfully 
distinct from it. Nevill, J. A. S. B. xxxix. p. 410. 
Gibhus {Gihhulina) vcrsipolis (F6r.) =/wwtVw/ws (Val.), Bourbon, the living 
animal of a rich dark orange colour. Nevill, ihid. p. 411. 
OxYGNATHA (ZoNITID^). 
The classification of the first family of Pulmonata proposed by 
C. Semper is the following : — 
Family Zonitidce, A raucous pore at the hinder end of the 
foot. Jaw smooth, without ribs. Lateral teeth of the radula 
subulate or bicuspidate. 
Subfamily 1. Ceraiophot'a. A horn-like prominence above 
the mucous pore; under surface of the foot longitudinally di- 
vided into three parts. 
Tennentia, Parmarion, Puplecta, n. g., Macrochlainys, Dendrolimax (Dohrn), 
Helicarion, Etcrypus, n. g., Rotula (Albers), Martensuiy n, g., Microcystis^ Ma- 
croco'oSf n. g. [Here should be inserted the American genus Stenopms or 
Guppy a.~\ 
Subfamily 2. Aceratophora. No horn-like prominence above 
the mucous pore ; under surface of the foot not divided. 
Ariophanta, XestUf Rhysota (Albers), Zonites. 
The anatomy of some Italian species of Liwaa?has been studied 
by F. SoRDELLi, Atti Soc. Ital. xiii. pp. 1-12 ; his observations 
lead him to distinguish the subdivisions of this genus in the 
following manner : — 
I. Internal shell inequilateral, dorsal keel incomplete. Sheath of the male 
organ simple, 
a. without flagelliform appendix ; Eulimax, Moq.-Tand. 
aa. as long as the matrix or longer : Limax dorice, dacampi, punctu^ 
latus. 
hb. not half as long as the matrix : X, maximus, psarus, variegatuSy 
arhorum. 
h. with a flagelliform appendix : Agriolimax, Morch, X. agrestis, L., and 
jilansy Hay. 
II. Internal shell equilateral. Dorsal keel complete. Sheath of the male 
composed of two parts. MilaXy Gray, X. marginatusy Drap., gagates and 
sowerhyi. 
Heynemann’s list of the slugs of Europe and adjacent countries enume- 
rates 18 species of LimaXy subgen. Ileyneinannuiy Malm, two of the subgenus 
Malacolimax, Malm, seven of the subg. AgriolimaXy Malm, one Lehmanniay 
Ileynem., five Awmha, Moq.-Tand., and one Lallcmantiay Baudon, the last 
only from the Canary Islands; further 28 species, the generic place of 
