EXPLANATION OF PLATE 1. E. 



LOWER PALEOZOIC CRUSTACEA. 



1 BEYRICHIA STRANGULATA (Salt). Magnified eight diameters (left valve of deep variety) and 



natui-al size, from Coniston limestone, of Coniston Water Head. 

 1 a Eight valve magnified eight diameters of the long variety, Coniston limestone, Coniston Water 



Head. 



1 h Left valve of intermediate variety, and natural size; the thicker margin imperfect in parts, the 



dotted lines indicating its completion. Same locahty. 



2 BEYRICHIA KLODENI (M'^Coy). Left valve magnified eight diameters, and natural size. Schists 



of Cowan Head. 



3 BEYRICHIA COMPLICATA (Salt). Left valve magnified eight diameters, and natural size, from 



schists of Pont y Meibion. 



3 a Eight valve magnified eight diameters. Same locality. 



4 CERATIOCARIS INORNATUS (Salt sp.) Natural size, from Tilestone of Benson Knot. 



5 CEEATIOCAEIS SOLENOIDES (M'^Coy). Natural size, shewing the ocular spot and obhque nuchal 



furrow, Upper Ludlow, Benson Knot. 



5 a Shorter specimen, shewing the two valves in contact. Same locality. 



6 CEEATIOCAEIS UMBONATUS (Salt sp.). Natural size, and magnified six diameters ; from schists 



of Dermydd-fawr. 



7 PTEEYGOTUS LEPTODACTYLUS (M'^Coy). The long penultimate or immoveable, 0»c^MS-hke 



finger of one of the didactyle pincers, with a portion of the peculiarly sculptured crustaceous hand 

 connected with its base, natural size ; from Leintwardine. 



7 a The terminal or moveable finger of probably the same pincer, seen from the opposite side, also 



shewing trace of the peculiar sculpturing of the hand near its expanded articular base. Same locality. 



7 h Portion of the sculpturing of the hand of fig. 7, magnified three diameters. 



7 c A shorter didactyle claw, or pincer, with both fingers in situ, belonging to a different pair 



from fig. 7, having a portion of the crustaceous hand and carpus attached, with traces of sculp- 

 turing resembling that of fig. 7, in character. Same locality. 



7 d A detached terminal joint (or the moveable finger) of a pincer identical with that of 7 c ; same 



locality. 



8 CEEATIOCAEIS! ELLIPTICUS (M'^Coy). Natural size; Upper Ludlow, Benson Knot. 



9 TEINODUS TAEDUS (Bey. sp.) Head natural size, and magnified sLx diameters : the dotted hne 



indicates the completion of the broken margin. From Ehiwlas. 



10 TEINODUS AGNOSTIFOEMIS (M-^Coy). Head natural size, and magnified six diameters: the 



dotted line indicates the portion of the margin which is wanting. From Ehiwlas. 



11 DIPLORHINA TRIPLICATA ? (Hawle and Corda). Head natural size, and magnified six diameters, 



from the black shale. Pen Cerrig, Builth. 



12 Undetermined, allied to Bellinurus ? 



13 AMPYX LATUS (M^Coy). Natural size, black shale three miles N. of Builth. 

 13a Ditto, magnified three diameters. 



14 TRINUCLEUS GIBBIFEONS (M'^Coy). Natural size, Caradoc limestone of Goldengrove. 

 14 a Ditto, magnified three diameters. 



