550 PEOF. PAYLOW ON THE CLASSIFICATION OF THE [Aug. 1 896, 



I have two specimens apparently belonging to this species, but too 

 badly preserved to be identified with certainty. They come from 

 the Maria Grube at Steinlach. 



AUCELLA VOLGENSIS, VCIV. RADIOLATA. (PL XXVII. figs. 2 a 2 b.) 



In oultine this is very like the typical Aucella volgensis, but is 

 distinguished by the feebly marked longitudinal streaks which 

 intersect the more marked concentric folds. A feebly pronounced 

 longitudinal hollow in the back part of the larger valve may also be 

 noted as characteristic of this variety, though less constant, as 

 appears from Russian specimens. In the Woodwardian Museum 

 collection this specimen was labelled as follows : — ' Inoceramus 

 iwon'ca fats, Bean MS., Donnington, Lower Greensand ' : it is in a 

 Spilsby Sandstone matrix. In Russia this variety occurs at the 

 same horizon as the preceding form. Judging from some fragments 

 of Aucella that I have obtained from Eheberg, near Oerlinghausen, 

 the existence of this variety in Germany is probable. 



Aucella Keyserllngi, Lahus., ' Ueber die russischen Aucellen/ 

 Mem. du Comite geologique, vol. viii. no. 1 (1888), p. 40, 

 pi. iv. figs. 18-23. 



The English specimen of this species (PL XXVII. figs. 3 a, 3 b, 3 c), 

 from the Woodwardian Museum, has the shell preserved, and can 

 be defined with certainty. It bears a label : ' Claxby. Tealby 

 Series. Inoceramus imbricatus.' The matrix is Claxbj^ Ironstone. 

 In Russia this species is very numerous in the zones of Ammonites 

 stenomphalus (Lower Petchorian). In Germany it is also far from 

 rare. I have seen many specimens of it in the Gottin gen Museum, 

 in the collection of the Rev. Pastor Denkmann at Salzgitter, and 

 in the collection of Herr 0. Weerth at Detmold. The German 

 specimens are very fine ; they come from the Maria Grube 

 at Steinlach, near Salzgitter, and from Eheberg, between Oerling- 

 hausen and Bielefeld. This seems to be the commonest species in 

 Germany. 



Aucella tePvEbratuloides, Lahus., ibid. p. 39, pi. iv. figs. 1-9. 



In the Woodwardian Museum a specimen of this species is 

 preserved, which in size and sculpture is very like that figured by 

 Prof. Lahusen in pi. iv. fig. 2, op. tit. I have not figured this 

 specimen. 



Beside the above, in Germany other species occur — for instance, 

 Aucella (Avicula) teutoburgensis, Weerth, which differs from all the 

 species above mentioned. In another note I propose to give my 

 opinion concerning this species and its relations to the other forms 

 of Aucella. 



The presence of identical species of Aucella in England, Germany, 

 and Russia more closely connects the corresponding beds of these 

 countries, as will be seen below. 



