1911.] NATURAL SCIENCES OF PHILADELPHIA. 475 



of a median slit, with some short converging furrows on each side 



(fig. 3). The mantle has the same profuse 



maculation figured for 0. pilsbryi. The 



mantle-lobes are not quite so large as in 



0. pilsbryi, but larger than in any other 



Omphalina. 



In genitalia (PI. XXXVII, fig. 1), it 

 resembles 0. pilsbryi, but the proportions 

 of penis and epiphallus differ, and the 

 latter is inserted much nearer to the distal Fig. 3. 



end of the penis than in 0. pilsbryi, only 



1.5 mm. from the end, being more nearly terminal than in any other 

 Omphalina. The epiphallus passes without abrupt contraction into 

 the vas deferens. The vagina is enveloped in a large chocolate 

 vaginal gland. 



The jaw is pale yellow, with a strong median projection. The 

 radula (PI. XXXVIII, figs. 3, 5) has 66, 7, 1, 7, 60 teeth. There 

 are distinct outer cutting-points on the central and lateral teeth, 

 the change to the marginal t} T pe is very abrupt. A group of mar- 

 ginals from the middle of the marginal field is figured. The teeth 

 decrease in size very gradually towards the outer margin of the 

 radula. 



The specimens examined and figured were collected at Monte 

 Sano, near Huntsville, Ala., by Mr. H. H. Smith. type locality 



is " Alabama." 



Binney found 66, 1, 66 (57, 9, 1, 9, 57) teeth in one, 46, 1, 46 teeth 

 in another radula. I doubt whether the latter radula was from an 

 adult individual. He describes it as with no side cusps, but having 

 cutting-points on the lateral and central teeth, thus agreeing with 

 the radula I examined in the shape of the teeth; but the number of 

 laterals was 9 in his preparation, 7 in mine. The genitalia as figured 

 by Binney agree well with my dissection except in one important 

 particular: he figures the epiphallus as arising near the base of the 

 penis, whereas I found it to spring from near the distal end. The 

 lower part of the epiphallus is bound to the penis, as shown in my 

 figure, and it is probable that Binney did not determine its real 

 point of insertion. 



The number of lateral teeth in 0. kopnodes exceeds that of any 

 others of our species examined except immature 0. friabilis from 

 Wyandotte, Okla., which has teeth of a quite different shape. 



