48 
FISHES. 
of Eels; but they are too indistinctly described to admit of their accurate determination: 
two of them are Anguilla, Thunb., that termed Pohioha, being pale ash-coloured, and 
the Oilo, being of a dark ash : of the remaining two, which are referable to the genus 
Murcena, Thunb., one has “ the snout depressed, and the crown of the head elevated; 
the body variegated with brown; the anterior teeth acute, and the posterior rounded” — L.; 
the other, named Puhinanae, is said, “when pursued, to conceal its tail in a crevice 
of the coral rocks, where it defends itself with great fierceness, inflicting severe wounds 
with its sharp recurved teeth.” — L. Of the anatomy of a species of Tetrodon, L., which 
was “ brown, spotted with while, and fenced with small bony obtuse spines” — L., the 
following particulars are given : “ The kidneys are large, resembling lungs in their 
situation, and liver in their structure; they are plentifully supplied with blood, by large 
branches from arteries which pass through them and unite just below. On dissecting 
off the sound, which is placed upon the kidneys, a number of vesicles were observed 
attaching the sound to , these organs. The connecting vesicles resemble the lungs of 
birds, and were probably the parts which led Dr. Garden into the mistake of ascribing 
to these parts the function of lungs, and into the consequent error of referring the fishes 
in which they were detected to the Linnean order Nantes. Analogy suggests that the 
office to which they are applied in the animal economy, is the secretion of air from the 
blood. The liver has one principal lobe, of an oblong form, large, of a yellow colour 
above, and deep green beneath ; the hepatic ducts unite near the centre into one, by 
which the bile is conveyed to the intestine ; and at the point of union of the ducts is 
suspended, by a tube one-third of an inch in length, the globular gall-bladder : in other 
words, the hepatic duct divides into two branches, one of which terminates in the ali- 
mentary canal, and the other in the gall-bladder. The intestines are large.” — L. Two 
species of Monacanthus, Cuv., were observed, one of which, the Oii.cho, was “gilded 
brown, with pale-brown fins, the edge alone of the caudal fin being pale-brown: it was 
furnished with a swimming bladder; had large male organs of generation; and a long 
intestinal canal, in which the stomach appeared merely as an enlargement of the intes- 
tine.” — L. The other Monacanthus, designated as Owiioi, is anew species, of which a 
specimen was brought home : it is described on a subsequent page, and a figure accom- 
panies the description. There were also brought home, from the same locality, the head, 
fins, and tail of the Zygcena Tudes, Val. 
On leaving Oahu, the course of the vessel was northwards ; and while sailing, but few 
fishes were met with. Among them was a small Exococtus, regarded by Mr. Collie as 
distinct from those of the Atlantic Ocean, principally on account of a broad translucent 
band in its pectoral fins ; but it is probable that it was merely the young of the Ex. 
mesogaster, Bl. At the time when this fish was found on board, an extensive shoal of 
small Bonitos were around the ship. A few days subsequently was obtained a fish 
designated as an Albicore, the falciform pectoral fins of which extended to opposite the 
anal fin ; on this account it may very probably be referred to the genus Orcynus, Cuv. 
*' The upper edge of this fin, which is about a line in thickness, corresponds, when it is 
lying along the side, to a similar rise above it in the side of the fish, so that there is a 
