MONOGRAPH OF BRITISIE LAND AND FRESHWATER MOLLUSCA. 253 
= 
Geomalacus maculosus Allman. 
1846 Geomalacus maculosus Allman, Ann. and Mag. N. HL, xvii, p. 297, pl. 9, f. 1-3. 
1867 — andrewsi Mabille, Rev. et Mag. Zool., p. 57. 
1890 = =— Jusitanus Pollonera, Boll. Mus. Zool., ete., p. 35. 
1875 Letourneauxia lusitana da Silva e Castro, Moll. Terr. et Fluy. Portugal, p. 242. 
77 Limax lusitanus Morelet, Journ, de Conch., p. 259, 
ISTORY.— Geomalacus macu- 
losus (maculosus, spotted) was 
first discovered in the vicinity of 
Lough Caragh, Co. Kerry, Ireland, 
during the autumn of 1842, by the 
late Mr. W. Andrews, of Dublin, 
who, perceiving the interest and 
novelty of the aninal, forwarded 
examples to Prof. G. J. Allman, 
who exhibited and described the 
new mollusk at the meeting of the 
Dublin Natural History Society in 
January, 1843. 
With this interesting — species, 
Lieut.-Col. H. H. Godwin-Austen, 
F.RLS., 1s associated, in appreciative 
expression of the merits of his 
masterly monograph of this species, 
published in his great work, ‘The 
Land Shells of India.” 
Diagnosis.— Geomalacus macu- 
losus is the only species of the genus 
found in this country, and is at once 
separable from the several kinds of 
Arion by the possession of a solid, 
calcareous oval plate beneath the shield, by the position of the generative 
aperture near the base of the right ommatophore, somewhat as in Linu, 
and from all the Limaces by the presence of the caudal mucus gland and 
the anterior position of the respiratory orifice. 
~—D 
INTERNALLY, it is distinguishable by the exceedingly prolonged atrium, 
and the genital retractor muscle being attached only to the spermatheca 
and its stem, and not to the oviduct also, as in Avvon. 
Description—ANIMAL very extensible, and reaching to fifty-five mill. or more 
when adult, some very large specimens collected at Glengariff by Mr. A. W. Stelfox 
were nearly ninety mill. in length ; the BODY is glossy, covered with about twenty- 
five longitudinal rows on each side of polygonal granulations; blackish or dark-grey 
Fic. 256. Fic. 207. Fic. 258. 
lic. 256.—Dorsal ruge of Geomalacus maculosus, showing their form and the arrangement of the 
pigmented areas, enlarged (after Heynemann). 
I'ig. 257.—Grooving of the hinder-part of foot of Geomadacus maculosus, enlarged (after Simroth). 
Fic. 258.—Caudal end of the body of Geomadlacus maculosus, showing the supra-pedal grooves and 
caudai gland, enlarged (after Godwin-Austen). 
