Notices of Memoirs — Dr. Winkler, on Pterodactylus microni/x. 417 



Beneath the lower jaw is the long thin bifurcated hyoid bone, the 

 horns of which are 0-007 mill, in length, and the body of the bone 

 measures 0-004: mill. The neck is curved. The cervical vertebrae are 

 certainly more robust than the dorsal ; but these are all too much 

 metamorphosed and mineralized to be accurately described and 

 separately measured. The tail is short, and seems to contain nine 

 or ten vertebree. Only the debris of the true ribs are seen ; they 

 are very thin. As for the false ribs, the author cannot detect a 

 single trace of them, and he agrees with Hermann von Meyer that 

 the parts sometimes taken for those organs are abdominal ribs. 



The sternum, coracoid, and scapula are too much hidden to 

 admit of a description. The humei'us is more or less curved ; its 

 length is 0-018 centim. ; the width of the acromial extremity is 

 0*003 mill., and that of the cubital extremity 0-005 mill. The fore- 

 arm is composed of two long bones, which seem to be anchylosed 

 together. The ulna of the right arm is 023 centim. in length; 

 the superior extremity of the right radius is 0-012 mill, in width ; 

 all these bones seem to have been hollow. 



Near the remains of the fore-arm are seen two small very thin 

 bones, which Dr. Winkler believed to be the bones named " Spann- 

 knochen" by the German savants; but after a careful examination, he 

 found them to be the remains of the ossified tendons of the two 

 bones of the left arm, as already noticed in Pterodactylus Wurtemherg- 

 icus, by Quenstedt. The carpal bones ai-e not sufficiently well seen 

 to be described. The slender metacarpal bones are not visible, but 

 we notice the two strong metacarpal bones of the long fingers 

 belonging to either hand. Their length is 0-022 mill., their width 

 in the middle 0-001 mill., and at both extremities 00015 mill. 

 ^Nearly the whole of the fingers of both hands are visible. Of those 

 of the left hand, which reposes on the right, the first has two 

 phalanges ; the ungual phalanx still bears the impression of its 

 claw. The second finger has three phalanges. Although the ungual 

 phalanx is nearly entirely hidden in the stone, we can nevertheless 

 recognize its contour and that of the claw. It is doubtful whether 

 the third finger has three or four phalanges. 



As for tlie three small fingers of the right hand, which are under 

 those of the left, it is easy to see that they are exactly similar. The 

 long finger of the right hand is composed of four phalanges ; the 

 length of the first is 0-03 cent. The apophysis of the carj)al ex- 

 tremity (seen in Pterodactylus spectabilis) is not visible in P. 

 micronyx, being covered by the matrix. The second phalanx has 

 been lost ; but from the impression it has left in the stone, we easily 

 obtain its length, which is 0-025 centim. The third phalanx is 

 separated from the preceding by the femur ; its length is 0-02 

 centim, The fourth phalanx tapers off to a point, without a claw ; 

 its length is 0-021 centimetres. The long finger of the left hand 

 agrees with thkt of the right, but is partly hidden by several other 

 bones. The two femora are complete. That on the right side is 

 quite visible; it is a little curved, it has a length of 0-018 centim. 

 The tibial extremity is expanded. That on the left side is not 



VOL. X. NO. CXI. 27 



