GIRTY, THE WEWOKA FORMATION OF OKLAHOMA 121 



smaller size, and from some of them by its elongated and cylindrical 

 instead of fusiform shape. In size, it resembles the European F. min- 

 ima, 3 but is somewhat larger, more slender in shape, and less fusiform. 

 The shape is suggestive of F. lutugini Schellwien 4 and F. longissima 

 Moller, 5 but the size is very much smaller. 



Horizon and locality: Wewoka formation; Coalgate quadrangle, Okla. 



Spongice 

 Wewokella gen. nov. 



The general shape of the present form is that of a cylinder with a large 

 tubular cloaca. No dermal layer has been observed. The walls are rigid and 

 made up of large spicules interlaced with one another. The typical spicular 

 element appears to be the tetraxon, but many spicules do not show this shape 

 and appear to be elongated, irregularly branched and more or less contorted. 

 In general, however, the trend of the spicules is longitudinal. 



The form for which this title is introduced is rare in tbe Wewoka for- 

 mation, only two specimens having come to hand. They might perhaps 

 be referred to the genus Doryderma, were it not for the fact that they 

 indicate a form which has a large central cloaca instead of a number of 

 axial canals, and in which the radial canals of Doryderma are also appar- 

 ently wanting. The general relationships of the type are nevertheless 

 supposed to be with that genus, which has also been cited from Carbon- 

 iferous strata. 



Type species, ~Wewol-ella solida. 



Wewokella solida sp. nov. 



Sponge body irregularly cylindrical, attaining a diameter of at least 25 mm. 

 Center occupied by a large tubular cloaca, the walls being about 7 mm. thick 

 and showing no evidence of being pierced by radial canals. If a dermal layer 

 was originally present, it has been lost. The walls now are made up of large 

 spicules, of which the typical shape is probably 4-rayed with one of the rays 

 more or less elongated. At the same time, some of the rays may be aborted 

 so that many of the spicules seem to be irregularly brauched. They are so 

 interwoven as to make up a wall of considerable rigidity, to aid in which the 

 spicules may be partly cemented, although it is doubtful if they anastomose. 

 The structure, then, while very varied in detail makes on the whole a homo- 

 geneous wall which apparently is the same on the inside as on the out. 

 Among the large spicules are other tetraxons of conspicuously smaller size. 



Horizon and locality: Wewoka formation; Coalgate quadrangle, Okla. 



3 Pal.Tontographica, vol. 55, p. 107. pi. 13, fig. 23. 1908, 



4 Idem, p. 177, pi. 17, figs. 2. 3. 7, 8, 12-14. 



5 Idem, p. 163, pi. 13. figs. 14-20. 



