TROGLODYTID ©. 93 
the roof of the cavity to its upper anterior extremity, constantly 
diminishing in depth (as in Zhryophilus), or is carried ‘still further 
round to the lower anterior end, as in Salpinctes, where it is arched 
outwards so as to be parallel with the external scale. This septum 
is not noticeable in the specimen of Heleodytes before me ; in all 
others where the nostrils are sufficiently open it is quite appreciable. 
This lateral septum is sometimes vertical or parallel to the median 
septum ; in Cinnicerthia, however, it is slightly revolute, showing a 
free edge perpendicular to the median plane, which forms a low wall 
dividing the oval nasal cavity into two parts, but not coming to the 
surface. In Heterorhina this wall is higher, reaching the level of 
the nostrils, but not adherent to the edges; while in J/icrocerculus, 
if the indications of the poor specimens of JZ bambla before me are 
not misinterpreted, this septum is united to the edges, forming a 
bridge separating two cavities. 
In most forms of Troglodytidz 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 varies in de- 
velopment, least in Campylorhynchus, more distinct in Thryothorus ; 
while in Pheugopedius, 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 much exposed. In Heleodytes, and in some forms of 
Campylorhynchus, the nasal aperture, as in Donacobius, 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 small, circular, and entirely sur- 
rounded by membrane. In the others, it rests against the lower 
side of the nasal groove at its anterior extremity, with membrane 
above and behind it only. 
The bill, in most species, is long, slender, subulate, and decurved ; 
in Cinnicerthia, it is more conical. It is generally without notch 
at the end, except in Cyphorinus, Microcerculus, Heterorhina, and 
Thryophilus. The feathers of the forehead do not come as far for- 
ward as the nostrils, as a general rule. 
The lateral toes are about equal, the outer very little the longer ; 
in Salpinctes and Catherpes, however, the discrepancy is very 
marked. In Heleodytes the tarsus is as short as the middle toe, or 
shorter; in all others it is longer, generally considerably so. The 
legs are very stout in Heleodytes, Campylorhynchus, and Oinnicer- 
thia ; in the others they are more slender. 
