1,56 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



NOTE ON ARIUNCVLUS AUSTRIACUS, n.sp., FROM THE ALPS IN 



AUSTEIA. 



By J. P. Baboe, of Prague. 



Read lOth June, 1898. 

 Aeiunculus Atisteiacus, n.sp. 



Animal thick and short, obtusely pointed behind, of the form and 

 size of Ariunculus Isselii, Bgt.; shield gibbose, minutely granulose; 

 back finely rugose, the rugae on the sides wide, depressed. Colour of 

 the head-shield and back, dark brown, whilst the sides in the anterior 

 portion of the body and the neck are light yellow, without bands or 

 spots. Margin of foot reddish, but blackish posteriorly, transversely 

 sulcate, and striped with brown, the stripes being alternately strong 

 and faint (thus exactly resembling the foot-margin of Arion empiri- 

 corum, var. marginatus). Caudal gland well defined, triangular, fairly 

 deep, surrounded by the dilated foot-margin. Genital orifice placed 

 between the respiratory orifice (which is situated towards the anterior 

 end of the shield) and the right tentacle. Foot-sole whitish, with 

 greyish lateral zones. No shell present. Length (in alcohol) 32 mm.^ 



Ji;ah. — Schneeberg, near Vienna (coll. Dr. A. Wagner). One 

 specimen is in the collection of the K. K. Naturhistorisches Hofmuseum: 

 no locality is given, but it probably comes from the Alps in the 

 neighbourhood of Yienna. 



Anatomy. — The pallial complex resembles that of Arion (the 

 nephridium is horseshoe - shaped), to which genus there is besides 

 a complete similarity in the form and arrangement of all the digestive 

 organs (the jaw may be accounted aulacognath ; the radula has not 

 been examined) and of the nervous system. The retractors of the 

 tentacles are symmetrical. The pedal gland is also like that in Arion. 

 By the agency of the blood-vessels small calcareous concretions are 

 formed. 



Genitalia. — The hermaphrodite gland is deeply pigmented, pyriform, 

 divided into two parts by the genital artery, small (in the second 

 example very large). The hermaphrodite duct is long, thin, undu- 

 lating, and without any diverticulum at the end. The albumen 

 gland is voluminous, long, and tongue - shaped. The convolute 

 common duct {c.d.) has numerous folds ; the prostate portion is of 

 a violet colour, the oviduct being white. The vas deferens (v.d.) is 

 relatively long, the sperm duct (Patronenstrecke) {sp.) distinct, rather 

 thick and cylindrical, having a globular termination, the inner surface 

 of which is studded with copulatory papillae. The receptaculum 



This new species, like Ariuncuhis Tsselii (Simroth [3], p. 331), quite gives one the 

 impression, at first sight, of being a dwarfed form of Arion empiricorum. 



