MOLLUSCA. 
22S 
in accordance with natural affinities to leave all the genera 
without external shell united in one subfamily, he is compelled 
to take this course by the incomplete state of our knowledge of the 
structure of the maxillse of numerous genera. 
Limacea. 
Dubreuil, E. Precede pour la preparation des Limaciens. 
Journ. Conch. 1864, pp. 243-245. 
The form and colours of a slug cannot he preserved in spirits. Therefore 
the author proposes to kill and wash the animal in pure water, to which, after 
six or eight hours, some salt should he added ; then skin the animal and pre- 
serve the cleaned skin glued to a piece of pasteboard and varnished. There 
are three preparations to he made— the first showing the hack, the second 
the foot, and the third the right side with the pulmonary orifice. To render 
each part complete, for each of them the body should he opened hy a longi- 
tudinal slit along the opposite side. , 
M. Stabile states that the colour of some species of Avion (for instance of 
A. rufus) is not inherent in the skin, hut in the mucus ; when the latter is 
removed, the colour is destroyed. Moll. terr. Piem. p. 126. 
Vaginulm hirmaniciiSy Theobald, Journ. As. Soc. Beng. 1864, p. 243, from 
Rangoon, Pegu, &c. 
Umax cinereo-niget' (Wolf). Stabile, Moll. terr. Piem. pi. 1. figs. 1 & 2, 
gives a figure of this species, agreeing with Heynemann, who considers it 
distinct from L. maximu.^, 1j. {cincrcusy Miill.). He distingtiishes two varieties : 
alhipo.s, with the sole whitish ; and nigripeSy with the solo black-edged. He 
says that L. lineatm (Dumont) is not specifically different. 
Umax alpinus (Studer, Per.). M. Bourguignat is of opinion that no such 
species exists in the Alps of France or Switzerland, but that it may have 
been established for a species of Krynickillus from Eastern Europe. Mai. de 
la Grande Chartr. p. 27. 
Umax erythriiSy Bourguignat, ibid. p. 33, pi. 2, uniform red ; and L. euha- 
liuSy Bourguignat, ibid. p. 35, pi. 1. figs. 5-8, black-spotted : both from the 
Grande Chartreuse. — Umax schwahiy v. Frauenfeld, Verh. Zool. Bot. Ges. 
Wien, 1864, pi. 20, blue, from Moravia; Umax Theobald, Journ. As. 
Soc. Beng. 1864, p. 244, from Pegu. 
Milax. Hr. Lehmann has given a contribution to the anatomy of Amalia 
marginata (Drp.), from which it appears that this genus is better reunited 
with Umax. IMalac. Blatt. 1864, pp. 149-156. 
Limacus is a new genus proposed by Lehmann, Malac. Blatt. 1864, 
pp. 145-149; it is very closely allied to Umax yhom which it differs only by 
the sculpture of the shield and back, and by the internal shell being a mem- 
branaceous plate which contains calcareous laminse. Descriptions of the in- 
ternal as well as of the external parts are given. L. hreckwortliianus from 
Victoria (Australia). 
Avion dvpvyamis, Bourguignat, Mai. de la Grande Chartreuse, p. SO, pi. 6. 
f. 1-4. Back keeled. Dauphin^. 
UrocycluSy g. n., J. E. Gray, Proc. Zool. Soc. 1864, pp. 250, 251 (with a 
woodcut) . It seems to be allied to Avion ; the ‘‘ subcaudal ” (rectius supra- 
