CONTENTS OF A BONE CAVE. 



AVES. 



Two bones of birds were discovered by Dr. van Rijgersma, one the coracoid of 

 a larger and a humerus of a smaller species. The first is robust, but not shortened. 

 Both its extremities are wanting, so that its determination is rendered difficult. 

 It presents average proportions, not displaying the lateral expansion seen in the 

 petrels nor the slender form of many waders. It resembles the corresponding 

 portion of a Grus, and also the same part in some birds of prey. There is a well- 

 defined inward-looking superior groove which is pierced by a large pneumatic 

 foramen at a good distance from the margin. There is a corresponding superior 

 foramen just below the scapular fossa. There is a rather large pneumatic fissure 

 on the flat supero-internal face within the glenoid face. 



The humerus above mentioned is that of a species of Procellaria in a restricted 

 sense. The bird was of rather small size, and the characters of its humerus are well 

 marked. Among these may be enumerated the prominent incurved posterior tube- 

 rosity of the head of the humerus, inclosing a deep fossa below it; the spur-shaped, 

 anteriorly directed, acute epicondylar process of the inner side of the distal extre- 

 mity. Within this spur is a strong coronoid fossa. The posterior border of the 

 external condyle is produced well backwards. 



MEASUREMENTS. 



M. 



Length of humerus . . . ' . . . . .066 



Width of proximal end . . . . . . .014 



" of shaft ........ .004 



" of distal end ....... .008 



Antcroposterior diameter of inner condyle .... .005 



" of external condyle . . . .007 



Length of epicondylar spur ...... .004 



MAMMALIA. 



As already observed, the mammalian bones are those of Rodentia and Artiodac- 

 tyla. The determinable species are considered separately, but another of unknown 

 reference will be first noticed. 



This animal is represented by proximal and distal portions of opposite humeri, 

 and both extremities of the femora, one of the latter being nearly entire. These 

 appear to have belonged to a rodent of the size of an aguti, and perhaps allied to 

 the group which that genus represents. 



The head of the humerus is subround, and, with the proximal part of the shaft, 

 a good deal incurved. The greater tuberosity is large, its rounded apex elevated 

 above the head and rather prominent, but not incurved, in front. Its anterior 

 margin soon joins the gently convex exterior margin of the shaft without irregu- 

 larity, and the extero-posterior side of the shaft at this point is flat. The lesser 

 tuberosity is quite small and separated from the outer by a wide bicipital groove. 



