44 MR. W. p. PYCRAFT ON THE [May 2, 



physes again succeed from the 11th vertebra and are continued 

 backwards to the thoracic. 



The cervical vertebrae are 12 in number. There are three 

 cervico-thoracic ; that is to say, there are three vertebrae bearing- 

 free cei'vical i-ibs. The 1st pair are reduced to the merest vestiges ; 

 the 2nd pair are long, bear vestigial uncinates, but no sternal 

 segment ; the 3rd pair bear large uncinates and a long styliform 

 sternal segment, which does not, hoAvever, reach the sternum. 

 Thus, it is obvious that, at no distant date, these three vertebraj 

 formed part of the thoracic series and ai-ticulated with the 

 sternum. Tliey differ, moreover, in form from the true cervicals, 

 and resemble the thoracic series in having broad outstanding 

 diapophyses. 



The cervical and cervico-thoracics of the Eurylfemidfe differ 

 conspicuously fi-om those of the Menuridae and of the Coracii- 

 foi-mes, and resemble i-athei' those of the liighei- Passeres. 



The thoracic vertebrae, six in number, have moderately developed, 

 quadrangular, neural spines. Only the 1st thoracic bears a small 

 hypapophysis. The centra are pierced by pneumatic foramina. 

 The last thoracic has been incorporated with the synsacrum. 



Twelve vertebi-te enter into the composition of the synsacrum in 

 Cali/ptomena and Ci/jnbirhi/nc/ncs ; loin Coryclon. The numeiical 

 differences are as follows : — 



Cali/pfomena. Cymhirhynclius. Gortjdon. 



Thoracic 1 1 1 



Lumbar 2 2 3 



Lumbo-sacral 3 2 2 



Sacral 2 2 2 



Caudal 4 + 8 free caudal 5 + 8 f I'ee caud . 5 + 8 free caud . 



Total 12 + 8 „ 12 + 8 „ 13 + 8 „ 



Thus Galypto')nena appeal's to have lost 1 post-sacral and 

 Cymbirhynchibs 1 pre-sacral. Coryclon wovdd appear to express the 

 primitive number of these segments. 



The 2nd lumbal' in Calyptomena bears a large pair of ventri- 

 lateral processes abutting against the pi'e-ilia. The 1st sacral 

 vertebra lies immediately caudad of the hinder margin of the 

 acetabulum. The dorsi-lateral processes of the sacral and caudal 

 vertebrae are long, and, by the ossification of the tendinous tissue 

 overlying them, form a broad bony plate dividing the innominates. 

 Thei'e are 8 free caudals, including the pygostyle. The diapophyses 

 of those immediately following the synsacral sei'ies are not 

 embraced by the innominate, owing to the fact that these are kept 

 apart by the outstanding dorsi-lateral processes of the synsacral 

 series. 



Coryclon and Cymhirhynchus differ from Calyptomena chiefly 

 in that the dorsi-lateral processes of the sacial and post-sacral 



