PLATE XXX. 



LLANDOVERY ROCKS (MIDDLE SILURIAN). 



Fig. 1. Illams {Bumastus) Barriensis, Mtjrchison. A solitary specimen from 



the Purple (Tarannon) shales of the 

 Onny River, Shropshire. (Mr. Wyatt- 

 Edgell's Cabinet.) P. 203. 



Figs. 2, 3. ///. [Bumastus) Maccallumi, Salter. Prom the Llandovery (not the May 



HUl) rocks of Girvan, Ayrshire. (See 

 also PI. XXVIII, fig. 1.) Pig. 2, tail, 

 full-grown ; 3, young specimen, dis- 

 membered. The free cheeks are yet 

 wanting; possibly they are spinose. 

 (Mus. Prof. Wyville Thomson.) P. 210. 



Figs. 4, 5. {Bysplams) nexilis, Salter. Llandovery rocks of Drummuck, near 



Girvan, Ayrshire. (Prof. Wyville Thom- 

 son's cabinet.) Figs. 4 and 5 show 

 the broad epistome, unlike that of 

 II. Bowmanni. (Mr. Wyatt-Edgell's 

 Cabinet.) Fig. 4 shows the fascia, which 

 is much bent in this species. P. 190. 



Fig. 6. ///. {Bysplams) Bowmanni, Salter. Llandovery mudstone of Mullock, 



Girvan, Ayr. (Cabinet of Prof. Wyville 

 Thomson.) P. 185. 



Figs. 8, 10. ///. [Bysplanns) Thomsoni, Salter. Llandovery rock. P. 188. 



8. Large intaglio in yellow sandstone, from 



Mullock, near Girvan, Ayrshire. (Prof. 

 Wyville Thomson's cabinet.) 



9. „ „ Side of head, showing eye and free cheek 



(very rarely found). The Gas Works, 

 Haverfordwest. (Mr. Wyatt-Edgell's 

 Cabinet.) 



10. „ „ Tail, from Mullock, Girvan, Ayrshire; 



showing truncate angles. (Woodw. 

 Mus.) 



lower SILURIAN. 



Fig. 7. ///. (Ii/a:i)us) M/o-c/tisoni, Salter. Caradoc hmestone of Chair of Kildare, 



Ireland. (Cabinet of Mr. Wyatt- 

 Edgell.) This should have been in 

 PI. XXVI. P. 201. 



