226 THE BATH OOLITE PERIOD. CHAP. 



formations in a bird e.g. emu, heron, dinornis. What appear 

 to be pneumatic foramina are observed in some of these bones. 

 The long internal cavities are such as seem destined to admit air 

 within the extremely thin close-textured cylinder of bone ; and in 

 one case of a scapula near the articulation we see thin plates of 

 bone crossing the cavity, and contributing to strengthen it where 

 resistance was needed. 



Of dorsal vertebrae we have no trace ; of ribs a few specimens 

 shewing furcate head and considerable length of slender, almost 

 straight shaft. Greatest length observed, 2- '25 inches, the specimen 

 belonging to the anterior dorsal series. The distance over both 

 articulating faces is 0*4 inch ; the shaft is only 0*125 in diameter; 

 it was hollow. 



Coming to the pelvic region, we must regret the absence of 

 sacrum, ilium, pubis, and ischium. There seems to be no complete 

 femur in our collection, except the small bent bone, Diagram LXXVI. 

 fig. i. The beautiful slender straight bone represented in Diagram 

 LXXVI. fig. 2, according to my latest examination and comparison 

 with dimorphodon l seems to be a tibia. 



Diagram LXXVI. Bhamphorhynchus Bueklandi. Scale one-fifth of nature. 

 I. Femur. 2. Tibia. 3. Phalangal bone. 



This bone, remarkable for its regularly cylindrical aspect, except 

 where it expands toward the extremities, is hollow throughout ; 

 the external sheath being somewhat thickened in its substance in 

 the middle parts of the shank. Length 3-6 inches; least diameter 

 0*15. The extremities are too much engaged in the stone to allow 

 of satisfactory description. Accepting this for tibia, we may as- 

 sume the femur to have been 2 '4 inches long. 



1 Fossil Reptilia of the Lias, Pal. Soc. Memoirs for 1869. 



