Horváth Géza (szerk.): A Magyar Természettudományi Múzeum évkönyve 21. (Budapest 1924)
Soós, L. ; Schlesch, H.: Notes on some Arctic Mollusca from Greenland
ON S0ME ARCTIO MOLLUSCA FRO.M GREENLAND. 103 The description of tho female ducl is • rather difficull in want of a generally accepted terminology, due. in turn, to the very imperfectly known physiologieal function of the single parts. There are. in general, three parts to be distinguished on it: the oviduct, the uterus and the vagina. The first part of the oviduct, i. e. that immediately following the hermaphrodite duct, is convoluted very much and eonglobated in a mass which can only be dissolved with great care and not without difficulty. It is beginning on the ventral side of the albumen gland, bending over then its dorso-laleral side (on the figure it is somewhat removed from its origiual position); its continuation, as a direet tube, is running first along the anterior margin of the albumen gland. tben is lurning down towards the direetion of the genital aperture. This non convolute part of the oviduct describes the form of an S. and is characterised by its appendix, the nidus gland („Nidamentaldriise"); this gland of L. Vahlii is irregular in shape. The spacious uteros („pyriforrn body") is long fusiform, somewhat flattened. With the term vagina we designate the short part of the female. duct between the genital aperture and the inosculation of the spermatheca duct. The spermatheca is very large, oval or nearly spherical in shape. its duct is slender and rather long. The spermiduct is rather broad, flattened, with the fleshy subreniforni prostate gland at its anterior end. Vas deferens as generally in Limnaea. The first penis sac 89 ) is very large. cylindrical or rather club-shaped, the second penis sac is more than the half the length of Ibe firsl one, cylindrical with well marked „head." The penis sacs have two kinds of retractor muscles. One or two are anterior and are attached to the dorsal body wall; two others are posterior and connected with the columellar musele. One of these latter museles is attached to the ,,head" of the second penis sac, quite close to the entering of the vas deferens; the other is ramifying to three branches one of which, the very strongest, is attached to the distal end of the first penis sac, and tlie two others much smaller ones to the second penis sae, not far from the attachment of the first branch. Male genital aperture is lying beneath the point of the uniting of the hinde edge of the right tentacle vvith the body wall. Radula is of the usual type of Limnaea with about ^9 teeth in half a row. 10 of which are bicuspidate, and 19 3—5 cuspidate, the 1 10 19 dental formula, therefore: Y"^ _ 2~~^3—5 30 ) We employ the terms used by ROSZKOWSKI and ZBBBOWSKA (Sur la structure des poches du penis chez himnees. IIJ : Travaux de la Soc, d, Sciences de Varsovje, 1915, No 9).
