DESCRIPTION OF SPECIES BRACHIOPODA 301 



the umbo prominent and projecting considerably back of the hinge line, 

 the median line of the valve prominent from beak to front without 

 median sinus, the sides curving at first more gently and then abruptly to 

 the lateral and cardinal margins. Brachial valve deeply concave, follow- 

 ing rather closely the curvature of the opposite valve and allowing but a 

 small space for the visceral parts of the animal. Surface of both valves 

 marked by rather fine, depressed convex, bifurcating, longitudinal costre 

 which are separated by grooves narrower than the costse themselves; 

 surface also marked by irregular, concentric, lamellose lines of growth 

 which become more strongly marked on somewhat worn specimens. 

 Spine bases few in number, rather stout, limited to the auricular and 

 lateral portions of the pedicle valve. 



The dimensions of two individuals are: Length, 12 millimeters and 

 13.5 millimeters; width, 11.5 millimeters and 14 millimeters; convexity 

 of pedicle valve, 6 millimeters and 6 millimeters. 



Remarks. — In its general form and size this species has some resem- 

 blance to the Upper Devonian Productella hallana Wale, but it is usually 

 a narrower shell, more prominent along the median line of the pedicle 

 valve, and with similar surface markings upon each valve. There is no 

 other species in the Kinderhook faunas which it at all resembles. 



CAMAROPHORIA BISINUATA (Rowley) ? 



1900. Seminula bisinuata Rowley, American Geologist, volume 25, page 203, 

 plate 5, figures 21-24. 



Rowley has described a small shell from the white cherts of Louisiana, 

 Missouri, as Seminula bisinuata. Specimens of the species from south- 

 western Missouri in the collection of Walker Museum, some of which are 

 internal casts, demonstrate the presence of a distinct median septum in 

 each valve, with a well defined spondylium in the pedicle valve. With 

 such characters the shell can not be placed in the genus Seminula, and it 

 seems more properly to belong to Camarophoria. In the Fern Glen 

 fauna a single example of a much crushed, smooth, rostrate brachiopod 

 shell, with a distinct and strong median fold and sinus in the anterior 

 half of the shell, is placed provisionally in this species. The presence of 

 a median septum is clearly shown in the pedicle valve, and it is probably 

 accompanied with a spondylium ; the median septum of the brachial valve 

 is not shown. Before distortion the shell apparently has a length and 

 width of about 10 millimeters each. 



