198 Mr. D. Sharpe on Secondary Fossils from South Africa. 



valve boat-shaped, with an obscure lateral lobe and the apex incurved towards the 

 left ; a small scar on the left side of the apex, marking its original attachment ; 

 upper valve squamose, slightly concave, with the apex bent back towards the left, 

 so that the beginning of the ligamental pit is exposed. 



Length 3 inches ; breadth 2^ inches ; depth of lower valve 1^ inch. 



Found at Sunday River and Zwartkop River. 



Dr. Krauss places this shell in the genus Exogyra, comparing it to E. Couloni : 

 it is, however, a Gryphcea, as the upper valve has not the spiral turn nor the lateral 

 hinge-tooth which distinguish the former genus : the species nearest to it in form 

 is the G. incurva of the Lias, from which it is readily distinguished by the recurved 

 apex of the upper valve. 



Fig. 3 a, side view of shell, with both valves ; fig. 3 b, exterior of the upper valve 

 of another specimen. 



Gastrochcsna Dominicalis, Sharpe. PI. XXIIL fig. 4. 



G. testa ovato-oblonga, antice inflata abbreviata, postice angustata : valvis concentrice cos- 

 tulatis ; costis nodulosis : tubo brevi, subinfundibuliformi. 



Shell oblong, round and shortened anteriorly, tapering posteriorly : valves 

 covered with numerous .fine concentric ribs, which are ornamented with a row of 

 small closely-set tubercles : tube short, enlarging rapidly from a small opening, 

 and blunt at the lower end. 



Length of the tube ^rd of an inch ; greatest diameter ^th. 



Found at Sunday River, near Enon. Other specimens of GastrochcencE are found 

 in wood, and others (one of them 1 inch long) in an old massive shell of a Trigonia ; 

 all from Sunday River. 



• Fig. 4 a, a fragment of bone bored all round by G astro chance, of the natural size ; 

 fig. 4 b, dorsal view of a pair of valves, twice their natural size. 



Neritopsis ? turbinata, Sharpe. PI. XXIIL fig. 5. 



N. testa depresso-globosa, crassa ; longitudinaliter lineis insculptis, transversim sulcis obso- 

 letis ornata. 



Shell thick, globose, with four rounded whorls, separated by a deep furrow, and 

 ornamented with fifteen equidistant deeply impressed lines, which are crossed by 

 numerous, unequal, slightly impressed lines of growth. 



Height fths of an inch ; breadth f . 



Found at Sunday River. 



The aperture not having been seen, the genus is left in doubt. 



