122 NATURAL SCIENCE. Feb., 1895. 



an equal extent behind and in front of the acetabulum. If I mistake 

 not, it is conspicuously unlike the pelvis of any existing bird in the 

 matter of width, and the bearing of this will be shown in the sequel. 



The femur, more slender than in existing birds of the same size, 

 is strongly curved, the flexor surface being concave. 



The tibia (or tibio-fibula ?) is almost perfectly straight, and has 

 only a small cnemial crest. 



The foot is a characteristically avian foot. In the Berlin speci- 

 men the matrix around the feet is so hard that a complete exposure 

 of them has proved impracticable. The London specimen shows the 

 left foot well. It is more massive and in every way larger than the 

 corresponding parts of the Berlin specimen. 



C. Herbert Hurst. 



(To be continued.) 



EXPLANATION OF PLATE I. 



A photograph of the Berlin specimen of Archccopteryx taken before the skull 

 and certain other parts were as fully exposed as they now are. (Scale 5 : 17.) 



1. First digit of left manus. 2. Second ditto. 3. Third ditto. 4. Radiale of 

 left carpus. 5, 6, 7. First, second, and third digits of right manus. 8. Region of 

 right wing which in the specimen lies lower than the visible bones of the hand and 

 lower than the region marked 10. 9. Primary quills of right wing. 11. Small 

 portion of matrix lying upon proximal end of humerus. (See reference to this in 

 the text.) 12. Yellow stain resembling, in the photograph, a shadow. 13. Cnemial 

 crest. 14. "Abdominal" or ventral ribs. 15. Feathers of crural aeroplane. 

 16. Joint between second and first phalanges of third digit. 17. Left femur. 



The specimen was illuminated at the time of photographing by light falling 

 upon it from above and in front and slightly to the left. 



