234 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



CEPHALOPODA. 

 Fam. BELEMNITIDiE. 



ACTINOCAMAX Spp. 



Belemnitiform guards are of rather frequent occurrence in these 

 opalized heds of Australia (Wliite Cliffs), having been first referred to 

 by Dr. Henrv Woodward as belonging to the genus Belemnitella, and 

 by later authors as Belemnites, under the species canhami, Tate, and 

 Jcieini, Giirich. Mr. G. C. Crick, of the British Museum, who has 

 examined the evidence, is of opinion that such remains would be more 

 accurately determined as Adinocamax, and that without question 

 they denote an Upper Cretaceous age. 



Locality/. — White Cliffs, New Soutli Wales. 



Collections.— Biitish Museum (Geol. Dept., C. 12086-7; Mineral 

 Dept., -iVo-7-) ; Rev. F. St. J. Thackeray. 



EXPLANATION OF PLATE VL 



The figures are of the natural size with the exception of 4, 14, and '23, which 

 represent magnifications of sculpture. 

 FIG. Unio sp. indet. 



1. An imperfect right valve with polished surface, exhibiting faint traces of 



concentric growth-lines in the posterior region. 

 Loc. White Cliffs. Rev. F. St. J. Thackeray Coll. 



Unio jaqueti, n.sp. 



2. Left lateral aspect. 



3. Ventral view of same, showing the shallow, depressed valves. 



4. Sculpture magnified, consisting of closely arranged radial striations. 

 Loc. Lightning Ridge. British Museum (Geol. Dept., L. 21833). 



,5. Left lateral view of another specimen, imperfect posteriorly. 



6. Dorsal view of same, exhibiting eroded umbones and a prominent ligament 



with annulations of growth. 

 Loc. White Cliffs. Rev. F. St. J. Thackeray Coll. 

 Unio white-cliffsensis, n.sp. 



7. Left lateral view, showing the umbonal V-shaped rugosities. 



8. Right laterial aspect of same, in which the posteriorly ridged area is seen. 

 Loc. White Cliffs. Rev. F. St. J. Thackeray Coll. 



Cyrenopsis australiensis, n.sp. 



9. Left lateral view of a slightly fractured example displaying the periodical 



growth-bands. 



10. Dorsal aspect of same, showing shallow valves and a short ligament. 

 Loc. White Cliffs. British Museum (Min. Dept., fWr)- 



Cyrenopsis opallites, Etheridge, jun. 



11. Right lateral aspect, showing a nearly orbicular contour. 



12. Dorsal position of same, exhibiting considerable umbonal convexity and 



elongate escutcheon. 

 Loc. White Cliffs. British Museum (Min. Dept., 80065). 



Cyrenopsis meeki, Etheridge, jun. 



13. Left lateral view, showing a triangularity of contour. 



14. Sculpture details magnified, in which the short and longer radial striations 



are seen crossing the concentric growth-lines. 

 Loc. Lightning Ridge. British Museum (Geol. Dept., L. 21832). 



