FROM NORTHWESTERN EUROPE III 
REMARKS. Externally, the species appears similar to forms such as “ R.” 
hopkinsi of the Bathonian which are normally referred to Burmirhynchia Buckman. 
However, there is considerable doubt as to many of the features of that genus and 
nobody appears to have published serial sections of topotypic material. Mr. E. F. 
Owen has kindly allowed the author to see sections of a Burmese specimen in the 
reference collection of the B.M.(N.H.), and while those seem to be closely comparable 
with those made of “ R.”’ ordinaria, this in itself is somewhat odd in view of the 
original description of the genus in which Buckman stressed the prominent nature of 
the median septum and dental lamellae, features only poorly developed in “ R.” 
ordinaria. ‘These latter features can be clearly seen in the burnt specimens figured 
by Buckman (1918) and are also in a specimen attributed to R. hopkins: from 
Chatillon-sur-Seine, which was sectioned for comparison. Although it is very 
difficult to judge to what extent such features observed externally will be developed 
as seen in transverse section, it is considered that their very weak development in 
“R.” ordinaria represents a marked discrepancy as compared with the species 
figured as Burmirhynchia by Buckman. 
In general shape and form of ribbing, “ R.”’ ordinaria is also comparable with 
certain species of the genus Kallirhynchia Buckman. Internally, it shows some 
resemblance to Kallirhynchia yaxleyensis, as figured by Muir-Wood (1934), especially 
in the development of its septalial plates and in the shape of the crura. However, 
Kallirhynchia, as it is at present defined, is restricted to the Bathonian and con- 
sequently it seems unwise to place ordinarza in that genus until intermediate forms 
have been described. At present the rhynchonellid faunas of the Bathonian and 
Callovian are very imperfectly known. 
” 
“Rhynchonella” pyrenaei sp. n. 
(Pl. 3, fig. 7, text-fig. 40) 
Name. Latin—Pyrenaeum-i, the Pyrenees ; the type locality is near Pau 
(Basses-Pyrénées). 
Di1AGNosis. Small to medium sized rhynchonellid ; length greater than width ; 
beak relatively large and suberect ; about twelve ribs, some of which bifurcate ; 
low uniplication ; crura radulifer. 
STRATIGRAPHICAL RANGE. Lower Oxfordian. 
TYPE SPECIMEN. Holotype from the Pic du Gar near Pau (Basses-Pyrénées). 
BB. 45161. 
MATERIAL. Large number of broken and poorly preserved specimens in the 
author’s collection. 
DIMENSIONS OF HOLOTYPE. Length 1-51 cm, thickness 0-87 cm, width 1-29 cm ; 
this is the only specimen figured, B.M. BB.4516r. 
DeEscrIPTION. External characters. The beak ridges and interarea are only 
weakly developed. The material was not sufficiently well preserved to allow the 
elucidation of the details of the pedicle opening and the deltidial plates. Concentric 
ornament was only observed on one specimen and consisted of growth lamellae. 
