MOLLUSCA OF INDIA. 63 
were similar in every way. ‘There is nothing remarkable from the 
ovotestis to the oviduct and vas deferens. The male organ and sper- 
matheca, however, are peculiar. The retractor muscle is, of course, 
very long, as it extends so far back in the body-cavity. The vas 
deferens is very long, and very much twisted and convoluted on 
itself, and in a portion of this twisted length the capreolus is no 
doubt formed. The spermatheca is not attached to the generative 
apparatus by a separate duct of its own, but rises close to and beside 
the retractor-muscle attachment, its duct running with, as if forming 
a part of, the penis. Now if we look at the generative organs of 
Anadenus (Plate VI. fig. 7) there is a good deal of similarity in the 
form of the long coiled vas deferens, and we have only to unite the 
duct of the spermatheca to that of the penis to bring about what is 
seen in Geomalacus. On opening out the vagina of Geomalacus, 
there is found a curious arrangement of the flattened folds, of which 
the central part with pointed end, situated close to the genital 
aperture (Gen.Ap.), may be the homologue of the dart in other 
genera. 
Monsieur Jules Mabille has given (/.c.) a paper on the genus 
Geomalacus, and enumerates some seven species, and he points out 
the differences between it and more or less similar genera. He is, 
however, over-critical, I think, on the English drawings that have 
been given of G. maculosus; for that in the ‘Annals and Magazine 
of Natural History’ is, I consider, a very good representation of the 
animal, judging from spirit-specimens, and it shows clearly the very 
distinctive mottled skin of the animal; it does not profess to give a 
magnified portion of the skin drawn from life and the minute white 
specks alluded to in the footnote, a character which is not an all- 
important one. When we examine the descriptions of the new 
species we find that they depend entirely on outward characters 
alone, so that M. Mabille leaves much to be desired ; and it will be 
an interesting and useful task if some French naturalist will take 
up the examination of the internal characters of these slugs. 
G. andrewsi, occurring in the same part of Ireland with macu- 
losus, can only be considered a variety, with more white than black. 
At the time when Forbes and Hanley, Mr. Gwyn Jeffreys, &c. 
recorded this slug in their works as a Great-Britain form, it was 
not known to occur in France. The last-named author pointed out 
that anguiformis, Morelet, of Portugal probably belongs to the same 
genus, and goes so far as to think it may be even the same species 
as maculosus, so that it was not at all unexpected by English natu- 
ralists that the genus should be found in France, a very natural 
range for it; how far it may extend eastward is now the point 
that interests us. From what is now known, its present range is 
the west of Europe and the countries on the Atlantic sea-board. 
