NOTES ON CARBONIFEROUS COCHLIODONTS 31 



emarginatus. The transverse arching near the inner end is much stronger than 

 in any other species of Sandalodas. The outer end was probably enrolled as 

 much as in S. laevissimus, but the enrolment is partially broken away. Enamel 

 punctation so fine that it can with difficulty be detected with the naked eye. The 

 tooth is peculiar in having a sharp ridge along the higher part running from the 

 outer end to the inner. From the antero-lateral border six small ridges with 

 sharp crests pass upward and forward, joining the large ridge at the top. The 

 posterior one of these ridges is quite strong, but they decrease in size progressively 

 toward the anterior end of the tooth, and the anterior one is very faintly marked. 

 No lines of growth are present. 



This species differs from 5. emarginatus in the presence of the 

 ridges above mentioned, in its greater transverse arching near the 

 inner end and lesser transverse arching near the outer end, in the 

 relative width of the alation, in the fineness of the enamel punctation, 

 and in its size. 



Formation and locality: St. Louis limestone; Salem, Ind. 

 Paleontological Collection, Walker Museum, No. 10050. 



Sandalodus latidens sp. nov. 



(Plate I, Fig. 11) 



Teeth of medium size, comparatively broad, not arched longitudinally, little 

 arched transversely. Pointed at the anterior end. The antero-lateral margin 

 forming a strong curve, the postero-lateral margin straight for i2 mm from the 

 outer border, then diverging to form a prominent shoulder, rounded at the outer 

 part. This shoulder extends out 8 mm , and from its point the postero-lateral 

 margin passes backward in a straight line, converging slightly toward the main 

 axis of the tooth, until it approaches the posterior border, where it curves inward 

 and meets the antero-lateral border in the line of the main axis. Surface of 

 enamel coarsely punctate. Lines of growth showing as delicate color markings, 

 with no ridges present. Greatest length of tooth, 4S mm ; greatest breadth, 27 mm . 



The breadth, shape, and punctation of this tooth are probably 

 of generic value, but it is here placed provisionally with Sandalodus, 

 as there can be little doubt that there was only one tooth to each 

 ramus of the jaw. 



Formation and locality: Keokuk limestone; Keokuk, Iowa. 

 Paleontological Collection, Walker Museum, No. 10035. 



Deltodus spatulatus Newberry and Worthen 



(Plate I, Figs. 10, 12, and 13) 

 Deltodus spatulatus Newberry and Worthen, 1866 (Paleontology of Illinois, 

 Vol. II, p. 100, Plate IV, Fig. 7). 



