82 08TEA.C0DA. 



Bairdia rhomboidea, Kirkby, 1858. Permian, Durham. 



Bdirdia rhomboidea, Kirkby, 18-58, Ann. & Mag. Nat. Hist. 3rd ser. vol. ii. 

 p. 433, pi. xi. fig. 3 ; Kirkby & Jones, 1859, Trans. Tyneside Nat. Field-club, 

 vol. iv. p. 149, pi. X. fig. 3. 



Bairdia Salteriana, Jones & Holl, 1868. Lower Silurian, Chair of 



Kildare, Ireland. 

 Bairdia Salteriana, Jones & HoU, 1868, Ann. & Mag. Nat. Hist. 4th ser. vol. ii. 

 p. 58, pi. vii. figs, llo, 116. 



Bairdia silicula, Jones, 1849. Chalk-Marl, Charing. 



Bairdia silicula, Jones, 1849, Mon. Pal. Soc, Cret. Entom. p. 27, t. vi. 

 figs. 20«-e. 



Bairdia subcylindrica, Miinster, sp., 1830. Carb. Limestone, Ireland ; 



Peimian Limestone, Sunderland. 



Cyihere mhcylindrica, Miinster, 1830, Jahrb. f. Min. p. 65. no. 21. 



Bairdia subcylindrica, Jones & Kirkby, 1865, Ann. & Mag. Nat. Hist. 3rd ser. 



vol. XV. p. 409, pi. XX. figs. 13a, h. 

 B. gracilis, M'Coy, 1844, Synops. Carb. Foss. p. 64, t. xxiii. fig. 7 ; Jones, 



Perm. Foss. t. xviii. fig. 7 ; Jones & Kirkby, 1866, Ann. & Mag. Nat Hist. 



3rd ser. vol. xviii. p. 42. 



Bairdia subdeltoidea, Miinster, sp., 1830. Tertiary and Cretaceous, 



Britain, Europe. 



Cvthere sttbdeltoidea, Miinster, 1830, Jahrb. f. Min. &c. p. 64 ; id. 1835, Neues 



"Jabrb. f. Min. &c. p. 446. 

 Cyiherina subdeltoidea, F. A. Roemer, 18.39, Jabrb. f. Min. p. 517, t. vi. fig. 16. 

 C. trigona. Bosquet, Mem. Soc. Royale Liege, iv. p. 358, t. i. fig. 3. 

 Bairdia subdeltoidea. Bosquet, M6m. Couron. Acad. Belg. xxiv. p. 29, t. i. fig. 3; 



id., 18-54, M^m. C. C. Gi5ol. Neerl. ii. p. 60, pi. viii. figs. 4a-/. 

 Cythere {Bairdia) subdeltoidea, Jones, Mon. Pal. Soc, Entomos. Cret. p. 23, 



t. 5. fig. 15 ; Jones, 1856, Mon. Pal. Soc, Tert. Entomos. p. 52, pi. iv. 



figs. 2a, 2b, 3, pi. vi. figs, la, 16, 2. 



Bairdia triquetra, Jones, 1849. Chalk, Gravesend ; Greensand, 



Blackdown. 



Bairdia triquetra, Jones, 1849, Mon. Pal. Soc, Cret. Entom. p. 27, t. vi. 

 figs. 19 a-c. 



BEYRICHIA, M'Coy, 1850. 



Beyrichia, M'Coy, 1852, Pal. Foss. p. 136 ; Jones, 1862, Mon. Pal. Soc. p. 120; 



Salter, 1866, Mem. Geol. Surv. vol. ii. pt. 1, p. 352, pi. i. 

 Cythere, M'Coy, 1844, Synopsis Carb. Foss. Irel. p. 165. 

 Distribution. Silurian and Coal-measures. 



Beyrichia affinis, Jones, 1855. Caradoc, Tramore, Ireland. 



Beyrichia affinis, Jones, 1855, Ann. & Mag. Nat. Hist. 2nd ser. vol. xvi. p. 171. 



