ABT.4 CAMBRIAN CONCHOSTRACA — ULRXCH AND BASSLER 121 



Page 

 Figures 20, 21. Entomidella? buprestis (Salter) 98 



20. An example, X 215 (after Jones) . 

 Cambrian (Menevian) : St. Davids, Wales. 



21. Specimen, X 3, possibly referable to this species. 

 Lower Cambrian (Hanfordian) Proiolenus zone, C1B2: 



Hanford Brook, New Brunswick. 

 22-25. Mononotella fusiformis (Matthew) 92 



22. Matthew's figure of the type, a left valve, X 4. 



23. Right side of an almost complete specimen, X 3. 



24. View of the same specimen from the ventral side show- 



ing the gaping edges, X 3. 



25. Cardinal side of this specimen, X 3. 



Lower Cambrian (Hanfordian, C1J53) : Hanford Brook, 

 New Brunswick (2f). 

 26, 27. Polyphyma lapworthi Groom 66 



26. A left valve, X 14. 



27. A left valve, X 10. (26, 27, after Groom). 

 Cambrian black shales: Southern Malverns, England. 



28, 29. Polyphyma marginata, new species 66 



28. Photograph of the type specimen, an incomplete 



left valve, X 4. 



29. Drawing of the same specimen, X 8. 



Upper Cambrian: Manuel's River, Conception 

 Bay, Newfoundland (6m). 



30. Polyphyma angelini (Barrande) 67 



A left valve, X 4 (after Linnarsson). 



Upper Cambrian: Olenus beds, Andrarum, Sweden. 



31. Polyphyma armata {GTonwaW) 67 



The type specimen, a right valve, X 6, of Beyrichia angelini 



armata (after Gronwall). 

 Middle Cambrian (Davidis zone): near Borregaard, 

 Bornholm, Denmark. 



32. Eremos bryograptorum (Westergaard) Moberg and Seger- 



berg 62 



The original illustration introduced for comparison with 



Alula. 

 Canadian (Bryograptus beds) Fogelsang, Sweden. 



33. Alula hollii Jones {Beyrichia hollii) 61 



The tj'pe specimen, X 23 (after Jones). 



Middle Cambrian (Menevian): St. Davids, Wales. 



