ESPECIALLY MYCTOPHOIDS 13 
vertebra 2 is a small fraction of a centrum bearing the upper four hypurals. As- 
sociated with the dorsal and lateral regions of the first preural vertebra and both ural 
vertebrae, are several uroneural elements which are long and thin and inclined 
postero-dorsally. The first uroneural, which is clearly associated with preural 
vertebra I and ural vertebra 1, bears a median anterior expansion. This expansion 
extends anteriorly above the neural arch of the first preural vertebra towards the 
neural spine of the second preural vertebra. With the dorsal region of this uro- 
neural expansion at least two epurals are associated. 
epl 
s hy6 
url 
ure 
CE : 
Ds ———— 
SA NE | 
ane SX hy! 
h.s 
ph 
pul __Imm__, 
Fic. 4. Ichthyotringa furcata (Agassiz). Caudal fin skeleton in lateral view. 
The caudal fin is composed of I9 principal rays of which 17 are branched. The 
accessory rays are shorter and unbranched and occur both above and below the 
caudal peduncle, there being 16 accessory rays in all. 
Scales. The whole body is covered with small cycloid scales, all of which are 
marked with concentric ridges. The scales along the course of the lateral line are 
noticeably different, being squarer in outline and bearing a longitudinal raised ridge. 
