FROM NORTHWESTERN EUROPE 23 
OccURRENCE. Unfortunately Wisniewska (1932) does not give any details of the 
associated fauna or of the type of lithology from which her material was obtained 
and Quenstedt (1852, 1871) only says that it occurs with Terebratula lacunosa. 
However, the author visited the original Quenstedt locality of Lochengriindle near 
Tubingen and collected material from ‘‘ Malm upper alpha’ and “ lower beta ’’. 
Both of these horizons are within the sponge reef facies and consist there of inter- 
bedded hard, argillaceous limestones and marls, occurring in units ranging from a 
few inches to two or three feet in thickness. M. striocincta, together with M. 
strioplicata, was found to occur predominantly in the marly units and was associated 
with a varied fauna of terebratulids, including the ribbed “‘ pectunculus”’ types, 
echinoid plates and spines, small ammonites and sponges ; lacunosellid brachiopods 
were present but were concentrated in the harder limestone bands. 
In the southern French Jura (Ain), the species has been collected from the Bedded 
Virieu Limestone (Ager & Evamy, 1963) just north of Lac d’Armaille. The Bedded 
Virieu Limestone is here represented by well bedded calc-lutites with alternations of 
calcareous shale ; as well as M. stviocincta, there is a rich fauna of lamellibranchs, 
terebratulids and the large asymmetrical rhynchonellid Torquirhynchia guebhardt. 
M. striocincta is one of the least abundant elements of the fauna, the majority of 
which suggests a high energy environment at or above wave-base (Evamy, 1963 
unpublished thesis). M. striocincta has also been collected in this area from the 
argillaceous Chavoley Beds and details of the occurrence are given under Lacunosella 
arolica. 
Monticlarella triloboides (Quenstedt) 
(Pl. 1, figs. 5-7, text-fig. 10) 
1852 Tevebvatula triloboides Quenstedt: 455, pl. 26, fig. 29. 
1858 Terebvatula triloboides Quenstedt: 643, pl. 78, fig. 13. 
1871 Tevebvatula triloboides Quenstedt: 129, pl. 40, figs. 6-9. 
1876 Rhynchonella triloboides (Quenstedt) ; Loriol: 188, pl. 23, figs. 41-43. 
1885 Tevebratula triloboides Quenstedt: 694, pl. 53, fig. 58. 
1904 Rhynchonella triloboides (Quenstedt) ; Loriol: 279, pl. 27, figs. 36-38. 
1913 Rhynchonella triloboides (Quenstedt); Jacob and Fallot: 34. 
1917 Rhynchonella triloboides (Quenstedt); Rollier: 119. 
1918 Stolmorhynchia triloboides (Quenstedt); Buckman: 46. 
1932 Monticlarella triloboides (Quenstedt); Wisniewska: 62-63, pl. 6, figs. 8-9. 
EMENDED DIAGNOosIS. Medium to large sized subpentagonal Monticlarella ; 
about 15-20 simple ribs ; no posterior smooth area ; radial striae only present in 
the troughs between the ribs ; uniplication in anterior commissure ; crura arcuifer. 
STRATIGRAPHICAL RANGE. Oxfordian—Kimmeridgian—Lower Volgian ; accu- 
rate records range from the tvansversarium to Gravesia zones, Quenstedt states that 
it is most abundant in the “ Malm gamma ”’, i.e. cymodoce and mutabilis zones. 
