186 
PLETHODCN CINEREUS _ 
Ber Oral el e) 
Dorsc - laryngeus 
Diga stivce S phary ily Te) 
Fig. 4. Cross-section in same series as the two previous figures, but more posterior, 
showing entire extent of M. dorso-laryngeus. 
in which case the muscle in question is a double one, or secondly, 
the laryngei might atrophy together with the laryngeal cartilages, 
thus leaving the dorsal portion alone. The latter is much the more 
probable because a gradually degenerating cartilage would affect the 
intrinsic laryngei far more than it would the extrinsic dorso-laryn- 
geus. 
The former are of use only as the arytaenoid cartilages are 
used and would diminish pari passu with the loss of the cartilage 
while the latter would be used in swallowing and would thus be retained. 
Again, if the former possibility were realized, it would be ex- 
pected that there would be a raphé in the place of the lost cartilage 
as in the case of the one above. It is thus altogether probable that 
the muscle is completely homologous with the one gee ee this name 
in other Urodeles. 
Below these two muscles, there appear transverse fibres on the 
ventral pharyngeal wall, sania do not meet in the median line, and 
which converge somewhat on the sides as they pass around the ieee 
This muscle at first appearance brought the hasty conclusion 
that it represents the dorso-trachealis, but it was found to arise 
not from the dorsal integument but from the inner surface of the 
scapula. The muscle may be called here simply the Scapulo-pharyn- 
geus (Fig. 1 Scap. ph.) and its homology will be referred to later 
