PEATE a 
All specimens are figured natural size. 
In all cases: a=dorsal view. b=lateral view. c=anterior view. d=posterior view. 
Fics. 1 a-d. Monticlarella striocincta (Quenstedt). Kimmeridgian—cymodoce zone. 
(Bedded Virieu Limestone), N. of Lac d’Armaille (Ain), France. Collection of the Geology Dept. 
of Imperial College, London. 
Fics. 2 a-d. M. striocincta (Quenstedt). Oxfordian (“‘Malm alpha’’). Lochengriindle, 
Germany. Collection of the University of Tiibingen. 
Fics. 3 a-d. M. striocincta (Quenstedt). Details as fig. 2. 
Fics. 4 a-d. Monticlarella czenstochaviensis (Roemer). Oxfordian. Holy Cross 
Mountains, Poland. Collection of Dr. D. V. Ager. ; 
Fics. 5 a-d. Monticlarella triloboides (Quenstedt). Kimmeridgian, (‘‘ Weisser Jura 
delta’’). ‘‘ Schwabische Alb’’. Collection of the University of Tiibingen. 
Fics. 6 a-d, 7 a-d. M. triloboides (Quenstedt). Details as for fig. 5. 
Fics. 8 a-d. Monticlarella strioplicata (Quenstedt). Kimmeridgian, (“‘ Malm delta’’). 
Barrenberg, Germany. B.M. BB. 44130. 
Fics. 9 a-d. M. strioplicata (Quenstedt). Details as fig. 8. B.M. BB. 44131. 
Fics. 10 a-d. M. strioplicata (Quenstedt). Details as fig. 8. B.M. BB. 44132. 
Fics. 11 a-d. Lacunosella arolica (Oppel). Oxfordian, tvansversarium zone. Jura 
meridionale, France. B.M. BB. 44134. 
Fics. 12 a-d. L. arolica (Oppel). Oxfordian, (‘‘ Birmensdorfer Schichten ’’), Birmensdorf, 
Switzerland. B.M. BB. 44133. 
Fics. 13 a-d. Lacunosella pseudodecorata (Rollier). ?‘‘ Weis Jura gamma’”’. ?Tier- 
ingen. Collection of the University of Tiibingen. 
