462 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Apr. 18, 



This small Trigonia, in very perfect condition, both valves being 

 united and the ligament preserved, is distantly related to Trigonia 

 crenularis, Lamarck, figured by D'Orbigny, from the Craie Chloritee. 



Locality. — Cliffs on coast of S. Africa, near the Umtafuna and 

 Umzambani Rivers. 



Fragments of another species of Trigonia accompany this with 

 large tubercles like Trigonia rudis. 



Genus Inoceramus, Parkinson. 



Inoceramus expansus, nov. sp. PL XIII. fig. 5. 



I. testa ovato-obliqua, subdepressa, subsequivalvi, concentrice plicata; 

 margine cardinali elongato. 



Length of fragment 5^ inches. 



Shell ovate, oblique, rather depressed, subsequivalve, with concen- 

 trically prominent plications ; hinge-margin elongated. 



Several fragments were procured, showing the lengthened hinge 

 and great dilatation of this species *. One specimen has the valves 

 united. They are from soft greenish sandstone and hard siliceous 

 conglomerate, containing numerous fragments of broken shells. It 

 approaches slightly the Inoceramus latus of the Lower Chalk and 

 Upper Greensand. 



Locality. — Cliffs on coast of S. Africa, near the Umtafuna and 

 Umzambani Rivers. 



Genus Pecten, Bruguiere. 



Pecten QuiNauECosTATus, Sowcrby. — A small but perfect 

 specimen, associated with the Inoceramus^ is identical with the Upper 

 Greensand species from Warminster. 



Locality. — Cliffs of S. African coast, near the Umzambani River. 



Pecten, sp. ; allied to P. virgatus, Nilsson. A fragment too im- 

 perfect for description ; found associated with the Voluta. 



Locality. — Cliffs of S. African coast, near the Umzambani River. 



Genus OsTRiEA, Linn. There are two small species of Ostrceay 

 one of them attached to Inoceramus, too imperfect to determine. 

 Locality. — Cliffs of S. African coast, near the Umzambani River. 



Genus Teredina, Lamarck. A large mass of the tubes formed 

 by this shell in fossil wood, much weathered, with indistinct traces of 

 the valves, undistinguishable from the London clay species. 



Locality. — "White Men's Houses," near the Umzambani River. 



A group of smaller tubes from the same locality exactly resembles 

 Teredo antenautce of the London clay ; probably they are formed by 

 younger specimens of the first-mentioned species. 



* See also above, p. 453. 



