FROM TANGANYIKA AND KENYA 163 



Localities and horizon. Along Mbaru stream, 1 mile N.W. of Mbinga, Tangan- 

 yika. Also along Manyuli stream, just W. of Nautope and f mile N.W. of Nautope, 

 Tanganyika. Callovian. 



Remarks. The best preserved specimen retains the expanded outer lip, on which 

 are four fairly evenly spaced rounded ribs which terminated in labral digitations 

 (now broken off). No doubt a further digitation, also no longer preserved, adhered 

 to the spire. Rounded spiral cords of secondary strength occupy the intervals 

 between the main ribs, three being visible in the least eroded interval. This speci- 

 men agrees very well with some of the above-cited figures of the typical H. oceani, 

 for example, Piette's pi. 45, fig. 1, and differs from any of that author's figures of 

 other species of Harpagodes. It is, of course, possible that, if perfectly preserved 

 specimens were available, the form now recorded would prove to differ from Brong- 

 niart's species in the details of its labral digitations. H. oceani occurs typically in 

 Europe in the Upper Kimmeridgian (Portlandian of French authors) and is not 

 known from any horizon as low as Oxfordian, the latest possible age of the East 

 African specimens. 



Harpagodes thirriae (Contejean) 

 PI. 28, figs. 1, 2 



i860. Pterocera carinata Contejean : 243 (non Roemer sp.). 



i860. Pterocera Thirriae Contejean : pi. 9, figs, i, 2. 



1861. Pterocera Thirriai (sic) Ctj. ; Thurmann & Etallon : 133, pi. 12, fig. 109. 



1861. Pterocera Oceani Delab. ; Thurmann & Etallon : 133, pi. 12, fig. no. 



1891. Harpagodes Thirriae (Contej.) ; Piette : 452, pi. 55, figs. 2, 3 ; pi. 59, figs. 1, 2 ; pi. 68, 



figs. 2-5 ; pi. 71, figs. 1, 2. 



1897. Harpagodes cf. Thirriae (Contej.) ; Futterer : 615. 



i960. Harpagodes oceani (Brongniart) ; Joubert, pi. 12, figs. j,a-c. 



Material. Several specimens. 



Localities and horizons. io| miles S.W. of Raiya hills ; N. of Figfirya, 

 northern Raiya hills ; 1 mile S.W. of Melka Dakacha ; 3 miles N.E. of Melka Daka- 

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



Remarks. This species is easily recognized by the broad, strongly projecting keel 

 which is present on the middle of the later part of the last whorl. In addition, two 

 faint spiral ribs are visible below this keel on the internal moulds of which the material 

 studied consists. There are, however, no ribs above the keel corresponding to more 

 posteriorly situated digitations, three of which (including the one adhering to the 

 spire) are shown in Piette's pi. 71. In Europe this species has been recorded only 

 from the Kimmeridgian. 



