FROM TANGANYIKA AND KENYA 135 



Ceratomya excentrica (Roemer) 

 PI. 20, fig. 10 



1836. Isocardia excentrica Voltz MS. ; Roemer : 106, pi. 7, figs. ^a-c. 



1842. Ceromya excentrica (Voltz) ; Agassiz : 28, pis. 8a-c. 



1897. Ceromya excentrica (Voltz) ; Agassiz ; Futterer : 608, pi. 22, figs. 2, ia. 



1929. Ceratomya excentrica (Weir) (sic) ; Weir : 31, pi. 3, fig. 4. 



1934a. Ceratomya excentrica (Roemer) ; Arkell : 316, pi. 43, figs, u, 12. 



J 939- Ceratomya excentrica (Voltz) ; Stefanini : 249, pi. 25, fig. 7. 



i960. Ceratomya excentrica (Roemer) ; Joubert, pi. 10, figs. 10a, b (non pi. 11, fig. 1). 



Material. Several specimens. 



Localities and horizons. Hereri river crossing, 3 miles S. of Melka Kunha, 

 N.E. Kenya ; Kimmeridgian, Hereri Shales. 1 mile S.S.W. of Melka Dakacha, 

 N.E. Kenya ; Upper Kimmeridgian, Dakacha Limestones. 



Remarks. The specimens now recorded are typical in every way, showing coarse 

 ribs with various degrees of obliquity. 



Superfamily PANDORACEA 



Family THRACIIDAE Stoliczka 1870 



Genus THRACIA Leach 1823 



Thracia lens (Agassiz) 



PL 21, fig. 8 



1845. Corimya lens Agassiz : 267, pi. 36, figs. 1-15. 



1912. Corymya lens Ag. ; Lissajous : 103, pi. 12, fig. 21. 



1926. Thracia aff. lenii Ag. ; Schmidtill : 82, pi. 11, figs. 20a, b. 



Material. One specimen (no. LL.35161), ex B.P. Coll. 



Locality and horizon. Lihimaliao creek, at a point near Mbaru creek, Mandawa 

 area, Tanganyika ; Bajocian (?), Pindiro Shales. 



Remarks. This specimen, which is about 28 mm. long, agrees well with the 

 original figures of the species in its elliptical outline, its broadly rounded, depressed 

 umbo lying well posterior to mid-length, its evenly convex, gently sloping postero- 

 dorsal outline, and its evenly concave, gently sloping antero-dorsal outline. The 

 right valve is crushed. This species was originally described from the Bajocian of 

 Switzerland and has been recorded from the Bathonian of France, Germany, and 

 Sardinia. 



Thracia viceliacensis d'Orbigny 

 PI. 21, fig. 9 



1850a. Thracia viceliacensis d'Orbigny : 306. 

 1906. Thracia viceliacensis d'Orb 

 1911a. Thracia viceliacensis d'Orb 

 191 1. Thracia viceliacensis d'Orb 



Cossmann : 288, pi. 2, figs. 14—19. 

 Thevenin : 134, text-fig. 

 Flamand : 903, pi. 11, figs. 17a, b. 



