q6 JURASSIC BIVALVIA AND GASTROPODA 



Material. One specimen (no. L. 92095). 



Locality and horizon. Kulong, 2 miles S.W. ot Muddo Erri, N.E. Kenya ; 

 Callovian [?-Lo\ver Oxfordian], Muddo Erri Limestones. 



Remarks. The fossil now recorded is an ill-preserved specimen of a well-inflated, 

 moderately large, suborbicular Lucina, the length and height of which were origin- 

 ally just over 40 mm. It is of much the same size and shape as typical specimens 

 of L. lirata from the Lower Oxfordian of England, but its well-marked and fairly 

 evenly spaced concentric ridges are only about 0-75 mm. apart, whereas in specimens 

 of L. lirata from the type-locality the corresponding distance is 1-1-5 mm. 



Lucina cutleri sp. nov. 

 PL 15, figs. 3«, b 



Specific name. After the late W. E. Cutler, the first leader of the British Museum 

 East Africa Expedition. 



Diagnosis. Shell small (length 12 mm.), oval, only slightly longer than high, 

 feebly inflated. Umbo very broadly rounded, placed at anterior two-fifths of 

 length, level with feebly convex postero-dorsal margin, which makes a fairly well- 

 defined, obtuse angle with the posterior margin. Posterior margin a little flattened, 

 but merging in an even curve with the strongly convex ventral margin, which is also 

 continuous with the anterior margin. Antero-dorsal margin straight, visible in side- 

 view of shell, sloping gently, and merging in a broad curve with the anterior margin. 

 No lunule or escutcheon. Ornament consisting of narrow concentric ridges about 

 one-third mm. apart in later growth-stages and separated by flat, smooth 

 intervals ; ridges absent from antero-dorsal region, where margin is bordered by 

 narrow, smooth area. 



Holotype. No. L.52141. The only specimen. 



Locality and horizon. Lilomba creek, Tendaguru, Tanganyika ; Upper 

 Kimmeridgian, " Trigonia stneei " Bed. 



Remarks. In shape this species is rather like Lucina cardinalis Contejean (i860 : 

 327, pi. 21, figs. 14, 15), from the Kimmeridgian of France, but it is very much 

 smaller. In L. tarichensis de Loriol (1895 : 33, pi. 5, figs. 5, 6), from the Oxfordian 

 of Switzerland, another much larger species, the antero-dorsal outline of the shell 

 is more excavated. 



Family UNICARDIIDAE Fischer, 1887 



Genus MACTROMYA Agassiz 1843 



Mactromya eamesi sp. nov. 

 PL 15, figs. 8a, b, c 



Specific name. After Dr. F. E. Eames, Chief Palaeontologist of the British 

 Petroleum Co., Ltd. 



