The Invertebrate Fauna of the Uitenhage Series. 179 



its breadth. The outer lip is thin and the inner lip only furnished 

 with a very thin callus-coating. 

 Dimensions. 



Height of shell 33 mm. 



Height of body- whorl at the aperture ... 17 



Greatest width of the aperture 8*5 ,, 



Occurrence. The specimen was collected by Mr. Eogers from the 

 cliff on Buck Kraal, Sunday's Eiver (138h). 



Remarks. This is the only fresh-water form included among the 

 fossils found in the cliff-section on Buck Kraal, and it seems most 

 probable that it represents a merely stray occurrence in marine 

 strata, and does not indicate the presence of a fresh-water bed. The 

 specimen may have become washed down into marine surroundings 

 by flood-waters, but its fresh appearance suggests that it could not 

 have been subjected for long to the action of currents before becoming 

 embedded. 



The resemblance shown by this specimen to Limnaa longiscata 

 Brongn., * which occurs so abundantly in the Headon Beds of the 

 Hampshire basin and in the Paris basin, is really very striking. 

 Although selected specimens of L. longiscata may approach very 

 closely in all characters to the form with which we are dealing, yet 

 this may be well distinguished from most specimens of the Tertiary 

 shell by its more slender and elongated figure. The spiral angle of 

 L. longiscata is frequently wider, and the body-whorl is almost always 

 more tumid than in Limncea remota. 



CLASS CEPHALOPODA. 



GENUS PHYLLOCEEAS E. Suess. 



PHYLLOCEBAS ROGEBSI sp. nov. 



Plate VIII., figs. 19, 19o-c. 



Description of a Single Specimen. The shell is very involute, with 

 minute umbilicus. The umbilical wall is not abruptly marked off 

 from the flank. The whorls have a laterally compressed form, and 

 the flanks show a slightly convex surface. The height of the whorl, 

 measured from the umbilical rim, is greater than the breadth seen in 

 cross-section. The greatest breadth of the whorl-section occurs at 



* Edwards (1), p. 85, pi. xii., figs. 3a-/t ; Deshayes (1), p. 92, pi. xi., figs. 3, 4 

 (1825). 



