﻿Vol. 66.~\ srECiEs of ammonites and erachiopoda. 93- 



Another species of this genus is 

 Shireeirnia stephani (S. Buckman). 



1882. Amaltlieus (!) stephani. S. Buckman, 'New Species of Ammonites '" 

 Proc. Dorset N. H. & A. F.-C. vol. iv, p. 138 & pi. i, fig. 1. 



This species is angustumbilicate, the whorls being occluded 

 almost to the inner margin; but the slopes of the inner margins 

 being convex, it cannot be described as concavumbilicate. The 

 species is wholly levigate, and shows nothing of the tuberculate 

 stage. It differs therefore in umbilication and in ornament from 

 Sh. trigonalis; but it differs really because it has inherited at ani 

 earlier date the senile characters of that species. It shows the 

 same characteristic suture-line, and the trigonal whorl-section is 

 fairly marked. The type specimen has the complete mouth-border,, 

 quite plain, with a slight peripheral projection. 



This species comes from the same beds and the same place as 

 Shirb uirnia trigonalis. 



Genus Sonninia, Bayle. 



SONNINIA SEETRIGONATA, S. Buckman. (PI. XI, figS. 4-6.) 



This species was described in ' Descent of Sonninia & Hamma- 

 toceras ' Quart. Journ. Geol. Soc. vol. xlv (1889) p. 659 ; but it 

 was not figured, as it was supposed that it would soon be illustrated 

 in my Monograph of the Inferior Oolite Ammonites. As that 

 supposition has not been realized and is not likely to be accom- 

 plished, and as Mr. Tutcher has kindly made photographs of the 

 type, it seems desirable to give the illustrations now, to show what 

 an alticarinate Sonninia (a true Sonninia) is like, such as is men- 

 tioned in the stratigraphical paper, p. 55. 



Locality and stratum. — [Sandford Lane] Sherborne (Dorset) ■ 

 [from the sauzei zone by matrix] ; see Quart. Journ. Geol. Soc. 

 vol. xlix (1893) p. 492, Bed J a. 



Family Oppelidse. 



Genus Braeeordia, 1 now 



Type Bradfordia liomphala, sp. nov. 



Definition.— Compressed, involute, keelless ; inner area more 

 or less sunken to a shallow sulcus, bordered by a more or less raised 

 rim at the edge of the concave inner margin, lladii wide-angled,, 

 v-script, without peripheral projection, passing on to the periphery 

 and more or less distinctly over it. 



Distinction. — The absence of the carina distinguishes the 

 genus from Oppelia ; and the concave inner margin with its rim 

 bordering a depressed zone distinguishes it from Lissoceras, which 

 also shows a different run of radial line— sigmoid with peripheral 

 projection. 



1 Bradford Abbas. 



