162 PEOCEEDIXGS OF THE GEOLOGICAL SOCIETY. [Feb. 6, 



Caedita nuculoides, spec. nov. PL YII. iigs. 8 a-d. 



Shell quadrangular, subglobose, ornamented with fine, closely 

 arranged, radiating lines interrupted by a few crenulated regular 

 plications and fine concentric strise; umbones anterior, directed 

 forwards, involute ; lunule small, flat. 



Dimens. Length -8 millimetre, height '58, thickness '73. 



Log. Sunday's Eiver (Buhidge). The matrix is a greenish coarse 

 sandstone of quartzose and glauconitic grains with calcareous 

 cement. 



Beeenicea antipodum:, spec. nov. PL YIII. figs, 1 a, Ih. 



Polyzoon encrusting, rampant, composed of a single layer of cells. 

 Cells elongated, smooth, nearly cylindrical, but somewhat flattened, 

 quincuncially disposed; terminal portions prominent. Peristomes 

 circular, remote, and separated by about equal distances from one 

 another. The bases of the cells subelliptical, of unequal sizes, irre- 

 gularly arranged. 



Ohs. — Berenicea antipodum is allied to B, striata, J. Haime, of 

 the Lias of Yaliere, in its elongated and distant cells, and in ihQ 

 great diameter of the peristome. The cells of the African species 

 are smooth ; while in B. striata they are striated, and are less regu- 

 larly disposed. 



B. antipodum is the only Polyzoon hitherto known in the Secon- 

 d ary rocks of South Africa. 



Loc. — In a yellowish shell-rock, with grey patches here and 

 there. Prince Alfred's Rest ; encrusting Trigonia vau, and Placu- 

 nopsis undidata, from the mouth of Sunday's Eiver ; collected by 

 Dr. Rubidge. 



Isaste^a Eichaedsoni, M. -Edwards & J. Haime, var. nov. 

 antipodum. 



Corallum massive, or somewhat gibbous ; calicos polygonal, very 

 unequal in size, shallow, and separated by a moderately strong wall. 

 Fossula distinct; no columella. Septa thin, unequal in size, and 

 forming three cycles ; the six primary cycles are much larger than 

 the others, and become thicker near their inner edges ; but some- 

 times the secondary cycles are almost as much developed. 



Largest diameter of the calicos one and a half line. 



The African form of the species difi'ers from the type only in the 

 smaller size of the calicos, thinner walls, and more gibbous state of 

 the coral-mass. It is the first recorded fossil Coral from South 

 xifrica ; one example only is known. 



Isastrcea Bichardsoni occurs in the Inferior Oolite of England, 

 and resembles in its general aspect I. limitata and /. eccplanidata of 

 the Great Oolite of the Anglo -Norm an basin. 



Loc. Discovered by Mr. G. W. Stow in the Uitenhnge formation 

 en the Zwarlkop Eiver. 



