1LL/ENUS BOWMANI. 59 



1876. Illaenus barriensis, Armstrong and Young, Cat. West. Scut. Foss., p. 16. 



1877. Illienus (Bumastus) barriensis, Woodward, Cat. Brit. Foss. Crust., p. 40. 



1883. Illienus (Bumastus) barriensis, Holm, Svensk. Art. Illsenus (Bill. K. vet. Akad. Handl., 

 vol. vii, No. 3), p. 124. 



1885. Illaenus {Bumastus) barriensis, LindstrSm, Forteckn. (Intl. Silur. Crust. (Oi'v. K. vet. Akad. 

 Furhaudl., No. 6), p. 82. 



1886. Illaenus {Bumastus) barriensis, Holm, Rev. Ostbalt. Silur. Trilob., pt. 3, p. 164, pi. .\i. figs. 

 12—16. 



1899. Illienus {Bumastus) barriensis, Mem. Ceol. Surv., Silur. Rocks Brit., vol. i, Scotland, pp. 538, 

 673, 689. 



Remarks. — This well-marked species occurs in the Llandovery beds of the 

 Girvan area with moderate frequency, and is represented in most collections. 

 The specimens call for no special mention. 



Collections. — Mrs. Gray; Museum of Practical Geology; Edinburgh Museum. 



Horizons and Localities. — Saugh Hill Group (M. Llandovery) : Woodland Point. 

 Camregan Group (U. Llandovery) : Bargany ; Pond Burn ; Penwhapple Glen. 

 Penkill Group (Tarannon) : Penkill. 



1. IllEenus bowmani, Salter, 1848. 



1843. Ilhvnus centrotus, Portlock {non Dalman), Ceol. Eep. Londond., p. 300, pi. x, tigs. 3 — 6 {nou 



fig. 9). 

 1846. Illaenus centrotus, M'Coy, Synops. Silur. Foss. Ireland, p. 54. 



1848. Illsenus boumanni, Salter, Mem. Ceol. Surv., vol. ii, pt. 1, p. 339, pi. viii, figs. 1 — 3. 



1849. Illsenus bowmanni, Salter, Mem. Ceol. Surv., dec. ii, art. 2, p. 3. 



1852. Dysplanus centrotus .'. M'Coy, Synops. Palseoz. Foss. Woodw. Mus., p. 173. 

 — Illienus bowmanni, M'Coy, ibid., appendix, p. iv, pi. 1 e, tig. 19. 

 1854. Illienus bowmanni, Morris (e.p.), Cat. Brit. Foss., 2nd ed., p. 110. 



1866. Illienus bowmanni, Salter, Mem. Ceol. Surv., vol. iii, p. 317, pi. xviii, fig. 8. 



1867. Illienus {Dysplanus) bowmanni, Salter (e. p.), Mou. Brit. Trilob., p. 185, pi. xxviii, tigs. 7 — 10, 

 12, 13 {non figs. 6, 11 ; nee pi. xxx, tig. (i). 



1873. Illienus bowmanni, Salter {e.p.), Cat. Camb. Silur. Foss. Woodw. Mus., p. 54. 

 1875. Illienus bowmanni, Baily, Char. Brit. Foss., p. 39, pi. 13, figs. 5 a — c. 

 ? 1876. Illienus bowmanni, Armstrong and Young, Cat. West Scot. Foss., p. 16. 

 1877. Illienus bowmanni, Woodward {e.p.), Cat. Brit. Foss. Crust., p. 40. 

 1879. Illienus bowmanni, Nicholson and Etheridge {e.p.), Mon. Silur. Foss. Girvan, fasc. ii, p. 155 



(non pi. xi, figs. 6 — 8). 

 1882. Illienus bowmanni, Holm, Svensk. Art. Mam. (Bill. K. vet. Akad. Handl., vol. vii, No. 3), 



p. 48. 

 1899. Illienus bowmanni (e.p.), Mem. Ceol. Surv., Silur. Rocks Brit., vol. i, Scotland, passim. 



Remarks. — Of the multitude of specimens from various localities and horizons 

 which have been referred to this species by different authors, it is certain that only 



