FROM NORTHWESTERN EUROPE 21 
DISTRIBUTION. The species has only been recorded from Poland. 
REMARKS. The figured specimen and the series of serial sections were kindly 
made available by Dr. D. V. Ager. Lack of material precludes a full description but, 
from the limited material available and the specimens which have been figured, the 
species appears to be both consistent and distinctive. 
Although Wisniewska (1932) did not give any reason why she changed the name, 
it is presumed that she did so on grounds of incorrect transliteration. However, as 
this is not permissible under the International Code of Zoological Nomenclature, 
Article 32, (a) ii, the author has reverted to the original spelling of Roemer (1870). 
Monticlarella striocincta (Quenstedt) 
(Pl. 1, figs. 1-3, text-fig. 9) 
1852 Tevrebratula striocincta Quenstedt: 455, pl. 26, fig. 24. 
1858 Tevebratula striocincta Quenstedt: 634, pl. 78, fig. 12. 
1871 Tevebvatula striocincta Quenstedt: 131, pl. 40, figs. 17-19. 
1885 Tevrebratula striocincta Quenstedt: 694, pl. 53, fig. 57. 
1886 Rhynchonella cf. strviocincta (Quenstedt); Oppel and Waagen: 295. 
1917 Rhynchonella striocincta (Quenstedt); Rollier: 1109. 
1932 Monticlarella striocincta (Quenstedt); Wisniewska: 58-59, pl. 6, fig. 12. 
EMENDED DIAGNOSIS. Small, subpentagonal Monticlarella ; anterior commissure 
rectimarginate or slightly sulcate ; pedicle valve much more inflated than the 
brachial ; ornament of fine striae passing anteriorly into coarser ribs ; crura 
arcuifer. 
STRATIGRAPHICAL RANGE. Oxfordian—Kimmeridgian : tvansversarium to muta- 
bilis zones. 
TYPE SPECIMEN. Lectotype, here designated, fig. 16, pl. 40 in Quenstedt (1871) 
from the ““ Malm gamma _”’ of Lochen, Germany. 
MATERIAL. 90 specimens from the collection of the University of Tiibingen ; 
2 specimens collected by the author from the southern French Jura ; I specimen 
from the collection of the Geology Department, Imperial College, London. 
DESCRIPTION. External characters. The shell is biconvex with the pedicle valve 
the more inflated ; this results largely from the distinctive manner in which the 
posterior part of the pedicle valve bends over so that the top of the very small, 
pointed beak lies almost at right angles to the lateral commissure. Although the 
beak lies in this position it is not sufficiently incurved to obscure the delthyrium. 
In the material studied, the small, disjunct deltidial plates mentioned by Wisniewska 
(1932) have not been observed and there is an open delthyrium. 
The test ornament is distinctive and consists posteriorly of numerous fine striae 
which pass anteriorly into well developed, rounded ribs formed by the fusion of 
several striae ; the striae continue in the troughs between the ribs as far as the 
anterior margin. Growth lamellae are usually present but tend to be sparsely 
distributed and only poorly developed. 
