178 Annals of the South African Museum. 



EENSSELyERIA sp. ? 

 (Plate XXI., fig. 10.) 



There is one imperfect impression of the exterior of a brachial 

 valve (No. 152) of a large plicated brachiopod, apparently referable 

 to BensselcBria, but differing in details of the ribbing from any of 

 those above described. 



In shape it is longitudinally oval and generally flattened, but 

 slightly convex near the small inconspicuous beak which does not 

 rise above the curved hinge-line. The surface is marked by about 

 30 straight, simple, low and rounded ribs of subequal size, radiating 

 from the beak and separated by narrow furrows. Near the beak 

 each rib is divided by a longitudinal furrow extending about a 

 quarter of its length. Four or five rather strong concentric growth- 

 ridges are noticeable. 



Dimensions. — Length about 35 mm. ; width about 30 mm. 



Affinities. — The peculiar subdivision of the ribs near their origin 

 characterises this form, but it is impossible with this single example 

 to determine whether it should be referred to Bensselceria, Trigeria, 

 or Scaj^hocoelia. 



Locality. — (No. 152) " Unknown." 



TEIGERIA aff. GAUDRYI Oehlert. 

 (Plate XXL, figs. 11, 12.) 



There are two specimens in this collection from an " unknown 

 locality" (Nos. 150 and 151), in a soft greenish-grey marly and 

 micaceous mudstone (like No. 153 from Gydo Pass, Ceres), which 

 represent respectively the external and internal casts of brachial 

 valves belonging to the same species and perhaps the same indi- 

 vidual. One (No. 150) shows a very weakly convex subcircular 

 valve with an inconspicuous beak and curved hinge-line, and the 

 surface ornamented with 28-30 simple, straight, radiating, low and 

 rounded ribs of regular size, decreasing only slightly in size near the 

 cardinal angles ; narrow deep straight furrows separate them, and 

 they are crossed by a fine regular concentric lineation. There are 

 also two or three stronger concentric growth-lines. 



In the internal cast (No. 151) the number and character of the 

 ribs agree with the external cast, and there is one distinctly median 

 groove (but not larger in size than the rest) in front of the slightly 

 elevated closely placed and elongated impression of the adductors. 



