no 
PISCES. 
LEPTOOARDIL 
Amphioxus may be the young stage of Myocine. Putnam, P. Bost. Soc. 
j xiv. (1871) p. 365. ^ 
I On the chorda of Amphioxus ; R. Kossmann, Verb. Oes. Wurzb. vi. 
I pp. 82-93, pi. iv. 
' ProtistiuSy g. n. (? Mugilido&y ? Cyprinodontidce). First dorsal repre- 
sented by a single rudimental spine, second a little behind first anal rays. 
Ventrals present. L. lateral rudimental. Mouth bordered above by pre- 
maxillary only^ which supports a band of rather large bristle-like teeth, 
those of the outer series the largest. Dentary bones with strong sym- 
physis, and band of teeth like those of pre-maxillary. Swim bladder 
present ; alimentary canal short, simple. P. semotiluSy sp. n.. Cope, P. Ac. 
Philad. 1874, p. 66, Peruvian Andes. 
