r:t'-I 



TROaLOnYTIT).B. 



1): 



93 



tile roof of the cavity to its upper luiterior extremity, constantly 

 diuiiiii.sliing in depth (as in TlivjiuphHun), or is carried still lurtlier 

 ruiiii.l to the lower anterior end, as in S(ili>i>u-les, where it is arched 

 outwards so as to be parallel with the extcauuil scale. This septum 

 is not noticeable in the specimen of Ildeodytes before me ; in all 

 others where the nostrils are suiiiciently open it is cpiite apprecialdo. 

 This lateral septum is sometimes vertical or parallel to the median 

 septum ; in Cinnirerthia, however, it is slightly revolute, snowing a 

 liTc edge perpendicular to ti^e median plane, which forms a low wall 

 dividing the oval nasal cavity into two parts, but not conung to the 

 surface. In JJeterorhina this wall is higher, reaching the level of 

 the n(»slrils, but not adherent to the edges; while in Microarculus, 

 if tilt! indications of the poor specimens of M. bambla before me are 

 nut misinterpreted, this septum is united to the edges, forming a 

 bridge separating two cavities. 



In most forms of Truylodylidse the nostrils occupy the lower side 

 of the nasal groove, and are more or less elongated, and overhung 

 by a valvular convex or vaulted projection of the nasal membrane, 

 which is thickened and rounded at the edges. This variet in de- 

 velopment, least in Campylorhynchus, more distinct in T/iryolhorus ; 

 while in Pheuyopedius, it seems almost to close the aperture. In 

 Thryophilus, however, this scale-like projection appears to be 

 entirely wanting, leaving the nasal cavity broadly open, and the 

 lateral cavity nuich exposed. In HehodyUiH, and in some forms of 

 Cam]>ylorhynchuH, the nasal aperture, as in JJopavobiua, has its 

 anterior half resting in the end of the nasal groove, bordered only 

 behind and by thin membrane only, and with no lateral septum visi- 

 ble. In Cyphorinus, the nostril is snmll, circular, and entirely sur- 

 rounded by membrane. In the others, it r(!sts against the lower 

 side of the nasal groove at its anterior extremity, with membrane 

 aijove and behind it only. 



The bill, in most spoci'js, is long, slender, subulate, and decurved ; 

 in Cinnicerthia, it is more conical. It is generally without notch 

 at the end, except in Cyphorinus, Microcer cuius, Heterorhina, and 

 Thri/ophilus. The feathers of the forehead do not corns as far for- 

 ward as the nostrils, as a general rule. 



The lateral toes are about equal, the outer very little the longer ; 

 in Salpincles and C'atherpes, however, the discrepancy is very 

 I'.uirked. In Keleodytes the tarsus is as short as the middle toe, or 

 shorter ; in all others it is longer, generally considerably so. The 

 ItM's are very stout in Heleodytes, Campylorhynchus, and Cinnicer- 

 thia; in the others they are more slender. 





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