1885.] TROCHfLTDB, CAPRFM ULGI D E, AND CYPSELID.E. 899 



Fig. J). 



Fig. E. 



I'mx 



Fig. D. Under view of the skull of P««_5i'^^e7a, s«roe'i& (x 2). (Drawn by the 



author from a specimen in his own cabinet.) 

 Fig. E. Under view of the anterior portion of the skull of Cypsclus apus (x2). 



(after Huxley). 

 Fig. F. Under view of the skull of Tachycincta, thalassina ( X 2). (Drawn 



by the author.) 



Pmx, premaxillary ; Mxp, maxillo-palatine ; Vo, vomer ; Na, nasal ; PI, 

 palatine ; P(, pterygoid. In figure E the anterior e.xcavated end of the vomer has 

 a cresceutic shape, its angles terminating in free horns above tne jjalatine bones 

 by which they are concealed in the figure. The * directs attention to the 

 inferior portions of the antorbitals. They have a very peculiar form iu C. cqnis, 

 as shown in fig. E. 



