EXPLANATION OF THE PLATES AND WOOD-CUTS. 



this specimen is the Apus corniformis, of the rivers of central and southern Eu- 

 rope. 



The remains represented in figures 1 to 7 are considered by Dr. Milne Edwards 

 of great interest, as they exhibit characters intermediate between the living 

 Limulus and the extinct Trilobite. 



Fig. 10 and 11. Bones of the head of a Megalichthys. (See o?/^e', p. 443.) 



Fig. 12, a tooth, and fig. 13, a spine, are assigned provisionally to the genus Hybodus; 

 the characters of the allied coal-measure genus Diplodus not being yet published 

 by M. Agassiz. 



Fig. 14. A tooth of a Cochliodus. 



Fig. 15. A spine, assigned with doubts to the genus Pleur acanthus, the state of 

 preservation of the specimen not being good. The spine is round but com- 

 pressed, and is armed with two opposite rows of teeth. There are no traces in 

 the specimen of the groove mentioned by M. Agassiz as one of the distinguishing 

 characters of the genus. 



WOOD-CUTS. 



Fig. 1 to 4. Diagrams of the effects of faults in the coal-measures : p. 453. 



Fig. 5. Diagram of the effects of lateral pressure produced by faults, from the Holy- 

 well pits, Mahnslee : p. 454. 



Fig. 6. Section of changes of level produced by dislocation in the " best coal " Mea- 

 dow pits, Madeley : p. 454. 



Fig. 7. Diagram of a step-like dislocation at Priorslee, due apparently to unequal 

 hardness in the strata : p. 454. 



Fig. 8 to 10. Diagrams of complicated dislocations : p. 454. 



Fig. 11. Plan of minor faults and fractures inclosed between two principal faults, 

 the Boundary and Ketley : p. 455. 



Diagram of the minor faults which flank the Ketley fault near Donnington Wood fur- 

 naces : p. 456. 



WOOD-CUTS 



To illustrate the notice of Capt. Cautley and Dr. Falconer on the remains of a Fossil 



Monkey from the Sevdlik Hills : pp. 499-501. 

 Fig. 1 and 3. The Fossil Astragalus, natural size. 

 Fig. 2 and 4. Astragalus of the Semnopithecus Entellus, natural size. 



WOOD-CUT 



Explanatory of Mr. Darwin's paper on the Formation of Mould : pp. 505, 506. 



