154 The American Naturalist. [February, 
of the ventrals, the fin large, its anterior rays prolonged ; origin of 
dorsal equidistant from base of middle caudal rays and nares; caudal 
deeply forked, the lobes acute, 34 to 3% in the length ; anal rays 43-47 
in the length; ventrals always more posterior in position than in 
nubila, their tips extending to or past middle of base of anal; pector- 
als not reaching ventrals. 
A dark band forward from eye ; dark lateral band scarcely evident; 
silvery below ; sides and back with numerous irregular, well-defined — 
dark blotches; anal and sometimes ventrals with a dusky spot near 
base in front; dorsal and caudal faintly mottled; crimson spots on 
mandible, axil of ventrals and along base of anal. 
T. Agosia shuswap E. & E. 
Four specimens. Shuswap Lake, near mouth of Eagle River. 
These specimens differ from A. falcata in a few characters; inter 
gradations may be found, but none exist in our specimens. 
Dorsal equidistant from base of middle caudal rays and posterior 
half of eye, inserted directly over origin of ventrals; lateral band 
well marked, otherwise as in A. falcata. 
C. H. anp R. S. EIGENMANN. 
The Larynx of Batrachia.—Dr. H. H. Wilder states that 
Amphibia typically possess two pairs of laryngeal cartilages, an ante 
rior pair of arytenoids, while the posterior, containing tracheal rings 
as well as the future cricoids, are best called tracheal elements. In 
Proteus and Necturus but one -pair is. present, while in many Anun 
the tracheal elements fuse in the median line, forming a sort of cricoid. 
Wilder suggests, arguing from position, innervation, and musculature, 
that the arytenoids are the fifth branchial arches and are further 
homologous with the so-called inferior pharyngeal bones of Teleosts. 
The tracheal elements, on the other hand, are new formations. 
The Kidney of Amphiuma.—Dr. H. H. Field has studied the 
kidney anlage in young Amphiuma and finds’ that here as in the ge) 
cilians as described by Semon, there is a true metamerism. In 
material (which has already served for other studies published in these 
pages‘) the kidney reached back to the cloacal region, and it was poe 
sible to follow the different stages of formation of the canals. In the 
caudal region in the middle of each somite there was a wide, sharply 
*Anat. Anzeiger, vii, 570, 1892. 
*Verh. Deutschen Zool. Gesellschaft, 1892, p. 113. 
‘Hay, Am. Nar.. xxii, p. 315, 1888; Kingsley 1. c. xxvi, p. 671, 1892- 
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