194 University of Texas Bulletin 



upper end is club-shaped; this saddle is lower than the first lateral 

 saddle. The first auxiliary saddle is very broad and asymmetrical, its 

 flank nearest to the venter being concave, while the upper part and the 

 flank nearer to the umbilicus form a wide, rather regular curve. 



The fragmentary state of the only specimen found at four miles 

 south of Dundee does not allow a comparison with other species, 

 especially as most of the species belonging to Agathiceras are very 

 similar even in their suture. Of course, in general this species is 

 similar to A. Siiessi and A. uralicum, but the state of preservation 

 does not allow of drawing any conclusions. The species must be very 

 rare at the locality. 



The collection of ammonoids which was m'ade by Dr. Beede in Run- 

 nels County comes from a hard dolomite; all the specimens are casts 

 or molds, and it is often impossible to separate the fossils from the 

 rock. The state of preservation is thus very bad, but in most cases 

 we are able to get a good idea of the form and sutures of the am- 

 monoids. 



The little fauna consists of the following species : 



Medlicottia n. sp. I. 

 Medlicottia n. sp. II. 

 Perrinites n. sp. 

 Qastrioceras n. sp. 



This fauna is also entirely different from the one described by White 

 as well as from the one collected by Wrather and discussed above. 

 This does not surprise us, as it is considerably younger than these. 

 To demonstrate this we shall discuss also these species somewhat in 

 detail. 



Medlicottia n. sp. I 



Shell discoidal, very involute, flattened on the flanks, with a rather 

 deep and moderately broad furrow on the venter, and two lateral 

 keels. Cross-section of the whorl saggittiform, m,uch higher than 

 broad, greatest width at about three-fourths of the height of the 

 flanks above the umbilical border, truncated on the venter and notched 

 by the furrow. The flanks near the umbilicus, up to three-quarters 

 of their height, are nearly flat, while the upper quarter is rather 

 curved toward the venter. Both borders of the venter are formed by 



