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231 
consisting of two teeth, placed on each branch on the inner si- 
de of the posterior teeth. On the palate and vomer the teeth 
form either an uninterrupted line, or the anterior four, which 
are a little longer than the rest, are placed in quincunx; their 
number does not exceed 7. Each branch of the lower jaw is 
armed with a single series, separated bij a naked space on the 
symphysis. The small linear tongue does not extend beyond 
the posterior half of the cavity , and is immoveable, throughout 
tied bij the fraenulum. Each branchial cavity contains four den- 
sely fringed bony arches, each of which is composed of the nor- 
mal number of osseous joints. The arches as well as the bran- 
chiae increase backwards in size. The branchiae of the fourth 
arch nearly extend to the gillopenings. The inner surface of 
the upper portion of the hindmost arch is armed with teeth, 
resembling those of the jaws, but smaller and disposed in tri- 
ple -or quadruple series. The small oval gillopenings are pla- 
ced obliquely on the throat, across which their distance equals 
that from the eye to the point of the upper jaw. The opercles 
are small, osseous. The branchiostegous rays are bony, all 
terminating in filaments, except the first or superior ray, which 
is sickle- shaped, terminating in a broad hook. None of the 
rays extend beyond the anterior third of the gill membrane. 
Their number is generally ff on each side, in some one mo- 
re or less occurs on either side. The integuments covering 
the branchial cavities, are loose and may be greatly inflated. 
In a state of collapse, numerous fine longitudinal plaits mark 
the sides and anterior part of the throat. The vertical diame- 
ter at the occiput varies from 4!4, to 6, times in the length 
of the head. The vertical diameters of the body and the tail 
are neârly equal, and are contained from 3!/, to 4!/ times in 
the length of the head, The horizontal diameter slightly ex- 
ceeds the vertical. The lateral line may be traced, but indis- 
tinctly, from the side of the occiput, a little above the upper 
half of the head; above the pectorals it slightly declines and soon 
reaches (he middle of the body, which it follows to the point of the 
tail. The line consists of short undulating or arched tubes which are 
