PLATE XXXI. 



SILURIAN AND CARBONIFEROUS CRUSTACEA. 



Order — Merostomata. 

 Sub-Order — Xiphosura. 



Fig. 



1. Bettinurus regince, Baily, 1863. (P. 240.) Coal-measures, Queen's County, 



Ireland. Museum of the Geol. Survey of Ireland, Dublin. 

 1 a, 1 c. Specimens drawn of the natural size. 

 1 b. The same greatly enlarged. 



1 d. One of the thoracic somites enlarged. 



2. Bettinurus arcuatus, Baily, 1863. (P. 241.) Coal-measures, Queen's 



County, Ireland. Museum of the Geol. Survey of Ireland, Dublin. 



2 a. Specimen drawn of the natural size. 



2 b. A head-shield greatly enlarged. 



3. Bettinurus bellulus, Konig, 1820. (P. 239.) Coal-measures, Coalbrook 



Dale, Shropshire, &c. 



3 a. The original specimen in the cabinet of Prof. Prestwich, E.R.S. (enlarged). 

 3 b. Specimen originally figured by Buckland, and now in the British Museum. 



3 c, & 4. Bettinurus Kcenigianus, H. Woodw., 1872. (P. 243.) Coal-measures, 

 Dudley Coal-field. Both figures are enlarged. Original specimens in the 

 British Museum. 



5. Prestioichia rotundata, H. Woodw., 1867. (P. 246.) Coal-measures, 



Coalbrook Dale. (Natural size.) The original specimen in the cabinet of 

 Prof. Prestwich, F.R.S. 



6. Prestioichia anthrax, H. Woodw., 1867. (P. 244.) Coal-measures, Coal- 



brook Dale. (Natural size.) 



6, & 6 a. The original specimens in the cabinet of Prof. Prestwich, F.R.S. , &c. 



7 a, b, c. Prestwichia Birhoetti, H. Woodw., 1872. (P. 247.) Coal-measures, near 

 Padiham, Lancashire. (Enlarged twice the natural size.) 7 c, profile. 

 The original specimens in the collection of Mr. Thomas Birtwell, 

 Gawthorpe Gardens, Padiham, Lancashire. 



8. NeoKmulus falcatus, H. Woodw., 1868, enlarged. (P. 233.) Upper Silu- 



rian, Lesmahagow, Lanarkshire. The natural size given in outline. The 

 original specimen preserved in the British Museum. 



