On PropJiysaon^ etc. 



309 



lished descriptions.* Since then we have received through 

 the kindness of Mr. Gvvyn Jeffreys six specimens, preserved 

 in spirit, of Geomalacus 7naculosus, Allm. This enables us 

 to give the following description and figures. 



Jaw (fig. A), liigh, stout, dark horn-colored, arched, ends but little 

 attenuated, bluntly rounded ; anterior surface with about twelve, broad, 

 crowded ribs, of which four on the middle part of the jaw are stout, well 

 developed, denticulating either margin, and produced below so as to give 

 the appearance of a median projection to the cutting edge : the remainder 

 of the ribs are unequally developed in the several specimens examined, 

 being sometimes scarcely discernible; on one specimen is a median, 

 transverse line of reinforcement, parallel to the mai-gins of the jaw. 



Lingual membrane long, not very broad. Teeth arranged in horizontal 

 rows, of the form common to the Helicince. Centrals (lig. B) tricuspid, 

 laterals (Fig B) bicuspid, the external cusps of each being subobsolete. 

 Marginals (Fig. C) quadrate, with one long inner oblique, pointed cusp, 

 and one outer, small, pointed cusp. Extreme marginals lower than 

 wide, but retaining the same bicuspid character. 



B gives one 



Fig. A gives an enlarged view of the jaw 

 central and two lateral teeth of the lingual membrane 

 sives several marginals . 



C 



The genitalia are as usual in the limaciform Helicince. The testicle is 

 black, embedded in the upper lobe of the liver, connected by a long 

 epididymis to the oviduct. The ovary is tongue shaped. The oviduct is 

 convoluted. The genital bladder is small, round, with a long, delicate 

 duct. The vas deferens is twice as long as the whole genital system, four 



* Owing to our copy of Xachiichtsbl. mal. Gesellsch. being imperfect, the description 

 of Heynenftinn I, p. 105-168, pi. i, fig. 1, is known to us only from the notice in the Zoo- 

 logical Record, VI, p. 565. 



