FROM TANGANYIKA AND KENYA 51 



Family AMUSIIDAE Ridewood 1903 



Genus ENTOLIUM Meek 1865 

 Entolium corneolum (Young & Bird) 



1828. Pecten corneolus Young & Bird : 234, pi. 9, fig. 5. 



1900. Pecten demissus Phillips ; Muller : 527, pi. 17, fig. 10. 



1924. Pecten demissus Phillips ; Hennig : 14, pi. 2, figs. 1, 2. 



1929. Entolium solidum (Roemer) ; Weir : 23, pi. 1, fig. 33. 



1930a. Entolium demissum (Phillips) ; Arkell : 91, pi. 7, fig. 4 ; pi. 9, fig. 8. 



1930. Entolium demissum (Phillips) ; Weir : 87, pi. 10, figs. 4, 9. 



1933. Pecten {Entolium) solidus Roemer ; Dietrich : 65, pi. 8, figs. 118, 119. 

 1938. Entolium demissum (Phillips) ; Weir : 46, pi. 3, fig. 8. 

 1948. Entolium corneolum (Young & Bird) ; Cox & Arkell : 15. 



Material. Several specimens. 



Localities and horizons. Kulong, 2 miles S.W. of Muddo Erri, N.E. Kenya ; 

 Callovian [?-Lower Oxfordian], Muddo Erri Limestones. Wilderri hill, 11 miles 

 S.S.W. of Rahmu, N.E. Kenya ; Upper Oxfordian, Seir Limestones. Manyuli 

 stream, just W. of Nautope, Mandawa-Mahokondo anticline, Tanganyika ; Callo- 

 vian. Scarp face, E. margin of Makoko plain, Bagamoyo hinterland, Tanganyika ; 

 Upper Oxfordian. Hillside overlooking Lake Mbuo, Pindiro area, Tanganyika ; 

 Middle Kimmeridgian. Valley and scarp at Kindope, N.N.W. of Tendaguru, Tang- 

 anyika ; Upper Kimmeridgian, Nerinella and " Trigonia smeei " Beds. Kinjele, 5 

 miles W. of Mtapaia, N. of Tendaguru, Tanganyika ; Upper Kimmeridgian, 

 Indogrammatodon Bed. 



Remarks. Authors who have drawn a specific distinction between Pecten solidus 

 Roemer and P. demissus Phillips have admitted that stratigraphical rather than 

 morphological considerations have led them to do so. Mile C. Dechaseaux (1936 : 

 61) has regarded them as synonymous. Arkell has shown that Pecten corneolus was 

 the earliest name for the species commonly known as Entolium demissum. 



Entolium briconense (Cossmann) 

 PL 6, fig. 6 



1907. Chlamys (Syncyclonema) briconensis Cossmann : 108, pi. 3, figs. 14, 15. 



1913a. Chlamys (Syncyclonema) briconensis Cossmann ; Cossmann : 3, pi. 1, fig. 20. 



1917. Chlamys (Syncyclonema) briconensis Cossmann ; Couffon : 120, pi. 4, fig. 1. 



1924. Syncyclonema briconense Cossmann ; Cossmann : 30, pi. 5, figs. 1, 2. 



Material. Three imperfect specimens (two in B.P. Coll.). 



Localities and horizons. Plantation \\ miles N. of Dakatcha village, Coast 

 Province, Kenya ; in loose boulder. 2\ miles N. of Msaka road junction, Baga- 

 moyo district, Tanganyika ; Callovian. 



Remarks. The specimens referred to this species, which was previously known 

 only from the Callovian of France, have a characteristic ornament of concentric lines 

 arranged in pairs a constant distance apart. They agree particularly well with the 



