FROM TANGANYIKA AND KENYA 37 



Modiolus anatinus (Smith) 

 PI- 3, %• 7 



1817. Modiola anatina Smith : 89. 



1818a. Modiola cuneata J. Sowerby : 19, pi. 211, fig. 1. 



1818a. Modiola gibbosa J. Sowerby : 19, pi. 211, fig. 2. 



1818a. Modiola reniformis J. Sowerby : 20, pi. 211, fig. 3. 



Material. About ten specimens. 



Locality and horizon. Kidugallo Station and i\ miles to the east, Central 

 Railway, Tanganyika ; Bajocian, Station Beds. 



Remarks. The type-specimens of the above-cited species described by J. 

 Sowerby, which are in the British Museum (Natural History), are all from the Fuller's 

 Earth (Bathonian), although Sowerby wrongly stated that those of M. cuneata and 

 M. reniformis were from the Inferior Oolite. They all belong to the same species, 

 which Smith (1817) had described as M. anatina. In Europe it is wide- 

 spread in the Bajocian and Bathonian and has been recorded from the Callovian. 



This species differs from M. irnbricatus in its greater inflation, its shorter form and 

 more distinctly cuneiform outline, and shorter and more bulging antero-ventral lobe, 

 which is separated from the flank by a furrow which tends to become accentuated 

 when specimens, like those now recorded, have been partly flattened by pressure. 



Modiolus bipartitus (J. Sowerby) 

 PI- 3, fig- 9 



1818a. Modiola bipartita J. Sowerby : 17, pi. 210, figs. 3, 4. 

 1929a. Modiola bipartita J. Sowerby ; Arkell : 55, pi. 2, figs. 1-4. 

 1948. Modiolus bipartitus J. Sowerby ; Cox & Arkell : 4. 



Material. Two specimens (nos. L.52087, LL. 35093), the latter ex B.P. Coll. 



Localities and horizons. \ mile N.W. of bridge over Mkulumuzi river, 2 miles 

 W. of Tanga, Tanganyika ; Callovian. Tingutitinguti creek, Tendaguru, Tangan- 

 yika ; Upper Kimmeridgian, " Trigonia smeei " Bed. 



Remarks. These specimens have a shorter hinge-margin, a less pronounced 

 postero-dorsal angle, and a more convex antero-ventral lobe than those referred to 

 M. irnbricatus. They are smaller than the holotype of M. bipartitus and the other 

 English specimens figured by Arkell, but agree with them in shape. The affinities of 

 a specimen from Tendaguru recorded by Dietrich (1933 : 72, pi. 2, fig. 42) as " Modio- 

 la sp., Gruppe der M. bipartita " are less certain. The range of the species in England 

 is Upper Bathonian (Lower Cornbrash) to Kimmeridgian, but it is rare above the 

 Oxfordian. 



