GIRTY, THE WEWOKA FORMATION OF OKLAHOMA 125 



viduals and not colonies, nor is there any evidence that the individual 

 tubes were composite. On the whole, therefore, it seems more probable 

 that this fossil was an abnormal type of annelid. 

 Type species, Serpulopsis insita. 



Conularia crustula var. holdenvillae var. nov. 



A few specimens from the Wewoka agreeing in a general way with 0. crus- 

 tula differ in having the sculpture on a much finer scale. Unlike typical 

 crustula also, these specimens are more or less compressed and distorted, the 

 other form which apareutly had an unusually thick rigid test not having suf- 

 fered much in that way. About 25 costae occur in a linear distance of 5 mm., 

 and thus they are much more closely arranged than in the typical form. 



Among the specimens examined this variety is readily distinguished 

 by its sculpture, the difference being so marked that it seems desirable 

 to discriminate it as a new variety if not as a new species. It may possi- 

 bly be a young stage of C. rceperi, the only other Pennsylvanian Conu- 

 laria which has been described, although this form tapers more rapidly 

 than C. reopen, which has nearly parallel sides. 



Horizon and locality : Wewoka formation ; Wewoka quadrangle, Coal- 

 gate quadrangle, Okla. 



Brachiopoda 

 Roemerella patula sp>. nov. 



Shell rather small for the genus, rarely exceeding 18 mm. in diameter, though 

 in one instance reaching nearly 30 mm. Shape slightly oval in some specimens, 

 apparently circular in others. 



Convexity of dorsal valve low, regular. Apex small, slightly though con- 

 spicuously eccentric, situated about two thirds of a radius from the posterior 

 margin. Outline from the apex to the front slightly curved, so that the shape 

 is not truly conical, being somewhat inflated in the apical portion. 



Curvature of the ventral valve usually compound, more or less strongly 

 convex over the posterior portion and more or less strongly concave at the 

 front and sides. The prominent portion projects above the reflexed rim. The 

 point of highest convexity is usually well marked and is situated diametri- 

 cally opposite to that of the dorsal valve, or about two thirds of a radius for- 

 ward from the posterior margin. On the slope posterior to the point of 

 greatest elevation the pedicle fissure is situated. It is a conspicuous feature, 

 rather long and narrow, with strongly introverted sides. It extends in mature 

 shells from the point of greatest elevation half way to the posterior margin 

 and is surrounded without interruptions by the characteristic sculpture. 



The sculpture, as usual, consists of narrow, sharply raised concentric lira? 

 with considerably wider, flattened interspaces, which are also finely striated. 

 The lirae are somewhat irregular and are probably stronger and more persist- 



