MoUusca from the Bokkevcld Beds. 243 



overlaps the inner whorls ; the umbilicus appears to be small and 

 deep. The diameter (height) of the shell is about 20 mm., but 

 before distortion it must have been rather more. 



Affinities. — The variety of B. trilobatus described as tuviidus by 

 Sandberger * from the Lower Devonian of Nassau seems to bear 

 a considerable resemblance. In Bucaniella reissi, Clarke,! from 

 the Devonian of Brazil the trilobation is not so strongly marked, nor 

 the outer whorl so rapidly expanded. 



Locality.— {^o. 213) Gydo Pass. 



BELLEROPHON (BUCANIELLA) cf. REISSI, Clarke. 

 (PI. XXX., figs. 6, 6a.) 



There is one specimen (No. 107) which closely resembles B. reissi, 

 Clarke, I from the Devonian of Brazil, and also shows some points 

 of similarity to the allied B. coittinhoana, Hartt and Rathbun,§ from 

 the same horizon at Erere. The shell is subglobose, involute, 

 faintly trilobate ; the outer whorl increases rapidly in width and 

 height to the transversely expanded mouth ; the dorsal lobe occupies 

 about the middle three-fifths of the width of the whorl and is 

 rounded and prominent, but not sharply defined from the narrower 

 lateral ones. The umbilicus is deep and small ; the mouth is very 

 large and laterally extended. 



Dimensions. — Height of shell about 18 mm. ; width of mou.th 

 about 25 mm. 



Affinities. — The weak trilobation of the shell and prominent dorsal 

 lobe resemble B. reissi, but the broader more subglobose form and 

 narrower lateral lobes remind us of B. coittinhoana. 



Locality. — (No. 107) Road-cutting, north of Whupperthal. 



BELLEROPHON (PLECTONOTUS) aff. SALTERI, Clarke. 



(PI. XXX., figs. 7, la.) 



There is one fairly well-preserved specimen (No. 108) of a species 

 of BellcropJion which may prove to be new, the description of which 



* Sandberger, Verstein. rhein. Syst. Nassau, (1850-1856), p. 177, t. xxii. 

 tigs. 1, la, Ih. 



t Clarke, op. rit., p. 37, pi. ill., figs. 7-9. Katzer, op. cit., p. '201, t. xii., 

 tig. 11a, h. 



I Clarke, op. cil. 



§ Hartt and Kathbun, op. cit., p. 117. Clarke, up. cit., p. 38, pi. iii., tigs. 13-21. 



