90 



THE DEVONIAN OF MISSOURI. 



Fig. 7. Sections of Gypidula marionensis Greger. 



1-3. Gypidula marionensis Greger. Sections of the brachial valve showing the 

 extent of the loop. Fig. 1 is of a different specimen than figs. 2 and 3, and 

 is cut near the top of the valve. The dotted areas represent the cut edge 

 of the shell. 

 4 and 5. Gypidula marionensis Greger. Transverse sections in front of the short 

 median septum of the pedicle valve, showing the spondylia. 



Gypidula mineolaensis n. sp. 



Plate 23, figures 6, 10, 11 



Description — Pedicle valve moderately convex, the summit of the convexity directly 

 above the hingeline, from which the sides slope abruptly to the beak and cardinal margins 

 and gently to the other margins. The umbo projects strongly beyond the hingeline. The 

 beak is small and only slightly incurved. A very short median septum is present. The 

 cardinal area is small and rounds imperceptably to the rest of the shell. The delthyrium 

 is wide and low. There is no fold or sinus on the specimens collected. The valve is 

 marked by about 30 low angular plications which extend more than half way to the beak 

 in the middle of the shell but a much shorter distance near the margins. 



Only two brachial valves are in our collection, and they are imperfect. The shell 

 is much less convex than the pedicle valve. It is marked by similar plications and has 

 no fold or sinus. 



Remarks — The species resembles Gypidula multicostata Dunbar but the plications 

 extend only a short distance on the shell; fold and sinus are not present; the plications 

 extend to the cardinal margins, and the shell is much wider compared to the length. 



Occurrence — Mineola of Ralls County. 



Order Telotremata 



Superfamily Rhynchonellacea 



Family Rhynchonellidae 



Genus Camarotoechia Hall and Clarke 



Camarotoechia depressa (Kindle) 



Plate 24, figure 16. 



1901. Rhynchonella depressa Kindle, Ind. Dept. Geol. Nat. Res., 25th Ann. Rept., 



pp. 589-590, pi. 7, figs. 5, 5a, 5b. 



Kindle' s description — "Shell small, flattened, trigonoid-subovate in outline; cardinal 



lines forming nearly a right angles at the beak, the front uniformly rounded; length 



