BRUSINA : PAPVROTHECA, A NEW GENUS OF GASTROPODA. 1 63 



Papyrotheca contraria, sp. nov. 



(PL 11, fig. 5-) 

 This species varies very much from P. mirabilis. In the first 

 place the shell is apparently thicker, and therefore its form is not so 

 flattened, but rather semi-cylindrical. The spindle-shaped edge 

 forms a sharp ridge directly under the apex and runs further down, 

 quite different from the condition noticed in the preceding species. 

 The spindle lamella is well developed, and therefore forms a broad 

 septum, which is not crescentic but runs diagonally across the shell as 

 a straight line from the apex. The external edge above runs diagonally 

 and forms a much smaller septum, which curves towards a spindle 

 septum, it covers but little of the opposite large septum of the 

 spindle edge, only uniting itself at the apex. For this same reason, 

 there is absolutely no spindle-groove which can be compared with 

 P. mirabilis. The septum of the external edge consequently hardly 

 deserves the name, its edge is, as has already been mentioned, 

 diagonal, but in the opposite direction to the edge of the spindle 

 septum, and reminds one a little of the upper part of the mouth of 

 many Succ'mea. In other words, if one lengthened the lines of the 

 right and left septum, they would cross and form a figure thus X. 



The very imperfect specimen (fig. 5) is 3 millim. high, 1-9 millim. 

 broad, and not quite 1 millim. thick ; when complete it must certainly 

 have been not less than 5 millim. high. 



The first defective specimen, without the apex, I discovered in 

 Ripanj in 1887. I am almost inclined to believe that this species is 

 really scarce, and I am more inclined to believe that I have collected 

 it at that time on another spot. It is well known that at different 

 spots of the same horizon at the distance of a few metres one may 

 find different species. 



Explanation of Plate II. 

 Fig. 1. Papyrotheca mirabilis, Brus. Nearly complete specimen 4*5 



millim. high, i"9 millim. broad. Front view. 

 Fig. 2. Papyrotheca mirabilis, Brus. The largest specimen, very 



much damaged and with one groove at the septum, 



5*5 millim. high, 2 - 2 millim. broad. Front view. 

 Fig. 3. Papyrotheca mirabilis, Brus. Fragment, 3^2 millim. high, 



i-8 millim. broad. Back view. 

 Fig. 4. P. pseudogyra, Brus. Young specimen, 2 millim. high, o - 8 



millim. broad. Front view. 

 Fig. 5. P. contraria, Brus. Fragment, 3*2 millim. high, 1*9 millim. 



broad. Front view. 



All the figures are magnified. The original specimens are in 

 the collection of the National Museum, Agram, Croatia. 



A2 



