Yol. 57.] FROM THE ISLA^'D OF AREAN. 241 



the fossils of the Lower Lias which have been recorded from that 

 area do not correspond so nearly with the Arran specimens as do 

 those from the neighbourhood of Belfast. The zone of Avicula 

 contorta does not seem to be distinctly developed in the Western 

 Isles, according to Prof. Judd, although he had seen some indications 

 of its presence, and only last year, under Mr. Horace B. Woodward's 

 directions, some obscure fossils were obtained from Skye which 

 it is thought may represent these beds.^ The numerous other 

 horizons of Jurassic strata described in the Western Isles, having no 

 representatives among the Arran fossils, need be no further alluded to. 

 Above them, however, are Cretaceous rocks which Prof. Judd refers 

 to the Lower, Middle, and Upper Chalk : the last-named horizon being 

 that of Belemnitdla mucronata, and apparently corresponding with 

 the White Limestone of Antrim. If this correlation be correct, it 

 seems highly probable that the Arran limestone will prove to be on 

 the same horizon. 



EXPLANATION OF PLATE IX. 



Lower Liassic fossils from Ballymichael G-len, near Sbiskine (Arran). The 

 figures are of the natural size, except figs. 3, 11, 12, 13, 14, 17, 22, & 23. 



Fig. 1. Ammonites (.Mgoceras) angulatus, Scbloth. (M. 2971. E.) 



2. Amherleya acuminata (Chap. & Dewal.). (M. 296(5. E.) 



3. Cerithiicm Semele (1) Martin. X H- (P. 240.) 



4. Fleurotom,aria tectaria, Tate. (M. 2967. E.) 



5. Avicula lanceolata, Sow. (M. 2981. E.) 



6. Fecten {Chlamys) subulatus (?) Goldf. (M. 2911. E.) 



7. Lima pectin Oldest (Sow.). (M. 2913. E.) 



8. Lima succincta (Sehloth.). (M. 2917. E.) 



9. GryphcBa arcuata, Lam. (M. 2859. E.) 



10. MyoconcTfia -psilonoti C.^; 'Quenst. (M. 2911. E.) 

 W. CaTditaHcberti,T%r(\\\%m. x U. (M. 2924. E.) 



12. Niwulana {Leda) Tatei, Newton. X H- (M. 2980. E.) 



13. K^tculana, sp. X 2 (cf. Leda Quenstedti, Tate). (M. 2962. E.) 



14. Area (1). X 2. (M. 2939. E.) 



15. Cardinia Listerl (Sow.). (M. 2907. E.) 



16. Do. do. (showing hinge), (M. 2896. E.) 



17. Goniomya, sp. x 1^ (cf. G. rhomhifera and G. sinemuriensis, Oppel). 



(M. 2899. E.) 



18. Unicardium cardioides (Phillips). (M. 2912. E.) 



19. Tholadomya (!). (M. 2926. E.) 



20. Tancredia (Ij Peachi, sp. nov. (M. 2921. E.) 



21. Bitrupa globiceps (Quent'i.). (P. 232.) 



22. Fentacrinus hasaltiformis (?) Miller. X 2. (P. 246.) 



23. Do. do. X 2 (petaloid end of ossicle). (M. 2982. E.) 



[The numerals in parentheses are the registration-numbers of the specimens 

 preserved in the Geological Survey Collections.] 



Discussion. 



Mr. H. B. Woodward remarked that the occurrence of Ehaetic 

 fossils in Scotland was first noticed by Charles Moore, from speci- 

 mens obtained in the Drift at Linksfield, near Elgin. He (the 

 speaker) had mapped ' passage-beds ' between Trias and Lias in 



^ * Summary of Progress of the Geological Survey for 1899 ' p. 132. 



