1905.] OSTEOLOGY OF THE EURYL^MID^. 45 



components of the synsacral vertebrae are shorter, so that the 

 diapophyses of the first precauclal are overlapped by the hinder 

 ends of the innominate. 



Well-mai-ked intercentra appear on caudals 5-7, in each of the 

 three genera laere described. 



V. The Ribs. 



The cervical ribs extend from the 4th to the 12th vertebrae. 

 The 1st and 2nd, 10th and 12th, are represented by little more 

 than broad plenrapophysial lamellae ; in the remaining vertebra?, 

 however, these lamellae are narrow and ba.nd-like, and the ribs 

 slender and styliform, extending the whole length of the centrum. 



There are 3 cervico-thora.cic ribs. The first is reduced, only the 

 capitulum and tuberculum remaining connected by a common base. 

 The second is long, but bears no uncinate ; the third bears a short 

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



There are 5 thoracic ribs, of which 4 only reach the sternum. 

 The uncinates are long and extend backwards to reach the 3rd rib 

 from their base of attachment. 



In Goryclon the sternal segment of the 5th rib articulates by a 

 special facet with the stei-nal segment of the rib next in front. 



vi. The (Sternum and Shoulder-girdle. 

 (Text-figs. 13, 14, pp. 46, 47.) 



The sternum of the Euryla^midae is typically Passeriform, and 

 presents no very close resemblances to that of an}^ other group. In 

 some features it recalls that of the Cuckoos, in others of the 

 Oaprimulgi, but these are not of a nature likely to cause difliculty 

 in confounding the sterna of either of these groups with Passerine 

 sterna. 



In the Euryltemidae the corpus sterni is short and broad — the 

 breadth nearly equal to the length. The posterior lateral processes 

 are long, extending forwards to a point corresponding to a trans- 

 verse line through the middle of the corpus sterni ; the free ends 

 of these processes are spatulate. The metasternum has its free 

 border squarely truncate, so as to form a continuous line with the 

 free ends of the posterior lateral processes ; broken only by the 

 notch enclosed l^y this process. The anterior lateral processes in 

 Calyjytomena have their free ends truncated and curved slightly 

 backwards. In Corydon these processes are long, pointed and 

 directed forwards. Cymhirhynchus is intermediate in this respect, 

 the process bemg long, truncate, and directed forwards. The 

 articular surfaces for the sternal ribs are confined entirely to these 

 processes. 



There is no sinna interna. The spina externa shows only the 

 faintest indication of the bifurcate free end which prevails among 

 the Passerifonnes (text-fig. 13, s.e.). In Cymhirhynchtis and 

 Corydon this spine is triangular in section ; in Calyptomena it 



