46 SPECIMENS OF CETACEA. 



foramen which contained a great rete niirabile. The 

 7th cervical differed from the 6th in the transverse 

 process being formed only of the diapophysis or that 

 which springs from the neural arch, the parapophysis 

 being represented by a stunted tubercle on the side of 

 the body. See Plates II., IIL 



In the foetus the atlas had cartilaginous neural 

 arch, body, and transverse processes, though an 

 ossilic centre had formed in the ring between the two 

 anterior articular areas. The diameter was 12 inches 

 between tlie tips of the transverse processes. The 

 cartilaginous body of the axis contained a thick 

 osseous nodule which corresponded with the future 

 odontoid and with the attachments of the check 

 ligaments. Each half of the neural arch had its 

 ossihc nodule. The transverse processes were cartila- 

 ginous, and the diameter between their tips was 14| 

 inches. In the 3rd to the 6th cervical the centre of each 

 cartilaginous body contained an osseous nodule about 

 3|- by Z\ inches. The neural arches were cartilaginous, 

 and in each half a plate-like bar of bone had formed. 

 The large lateral foramina associated with the trans- 

 verse processes were complete, and their boundaries 

 were formed of cartilage. Between the axis and body 

 of the 3rd vertebra, and between the bodies of the other 

 cervicals, large cavities containing synovia were found, 

 similar to those in the intervertebral discs of the adult. 



17. Vertebrae, twenty of the more posterior caudals, with 

 nine chevron bones, from the same Finner, mounted 

 in serial order. The ten terminal caudals are shown 

 in the tio-ure below. 



