ISOPODA.. XRXLOBITA. 17 



Order III. ISOPODA. 



ARCH-ffiONISCUS, Milae-Edw. 1846. 



ArchcEomscuR, I\Iilne-E(lw. 1846, Ann. des Sc. Nat. vol. xx. p. 326 ; Brodie, 

 184.5, Foss. Insects, p. 13; H. Woodw. & Salter, 1865, Cat. & Chart 

 Foss. Crust, p. 8. 

 Distribution. Purbeck. 



ArchsBoniscus Brodiei, Westwood, 1845. Purbeck, "Wiltshire. 



ArchcEoniscus Brodiei, Westwood in Brodie's Insects of the Sec. Rocks, p. 10, 

 pi. i. ligs. 6-10 ; II. Woodw. & Salter, 1865, Cat. & Chart Foss. Crust. 

 p. 8, fig. 17. 



BOPYRUS, Bell, 1862. 



Bopyrus, Bell, 1802, Mon. Pal. Soc. 1862, pt. 2 ; H. Woodw. & Salter, 

 1865, Cat. & Chart Foss. Crust, p. 9. 

 Distribution. Greeusand. 



Bopyrus (parasitic under carapace of Palaecorystes StoJcesii), Bell, 1862. 



Greensand, Cambridge. 

 Bopyrm, Bell, Mon. Pal. Soc. 1862, Crustacea, pt. 2, pi. 3. fig. 3; H. 

 Woodw. & Salter, 1865, Cat. & Chart Foss. Crust, p. 9, fig. 18. 



PAL.ffiGA, H. Woodw. 1870. 

 Pal<sga, II. Woodw. 1870, Geol. ]Mag. vol. vii. p. 495. 

 Distribution. Cretaceous. 



Palaega Carteri, H. Woodw. 1870. Grey Chalk, Dover ; Chloritic Chalk, 



Cambridge ; Chalk Rocks, Luton, Beds. 

 PaJcpqa Carteri, H. Woodw. Geol. Mag. 1870, vol. vii. pi. xsii. tigs. 3-6, 

 p. 495 ; ibid. p. 588. 



Orderly. TRILOBITA. 



ACIDASPIS, Murchison, 1839. 



Acidaspis, Murchison, 1839, Silur. Syst. p. 658, pi. 14. figs. 10 & 15; 

 M'Coy, Svuop. Silur. Foss. in Ireland, 1846, p. 45, pi. iv. fig. 7; J. Hall, 

 PaL-Bont. 'New York, 1848, i. p. 240, pi. 34. fig. 5 ; PhiUips & Salter, 

 Mem. Geol. Surv. 1848. voh ii. pt. 1, p. 348, pi. ix. fig. 6; M'Coy, Ann. 

 & Mag. Nat. Hist. 1850, ser. 2, vol. iv. p. 401 : Barrande, 1852, Syst. 

 Silur. de la Boheme, p. 692, pis. 36, 37, 38 ; Saher, 1853, Decades Geol. 

 Surv. vii. pi. vi. ; Salter, 1873, Cat. Woodw. Mus. pp. 50, 03, 134, 166. 



