92 ZOOLOGY OF THE VOYAGE OF THE BEAGLE. 
teeth, which are found in Clinus, this genus has a narrow line of very minute 
teeth running longitudinally down the middle of the tongue, communicating a 
sensible roughness to the touch. Thirdly, the ventrals are more backward, their 
point of insertion being only a very little in advance of that of the pectorals. 
Lastly, it is remarkably characterized by having three, or one might almost 
say four, distinct lateral lines. The uppermost of these lines commences 
at the posterior angle of the opercle, whence it turns abruptly upwards 
and runs immediately beneath the base of the dorsal: the second runs 
along the median line of the body, but does not commence till a little beyond 
the base of the pectoral: the third commences a little above the insertion of the 
yentrals, and answers to the upper one, taking its course a little above the 
anal: there is also part of a fourth, which originates between the ventrals, and 
joins the third at the commencement of the anal. All these lines are marked by 
larger and differently formed scales from those on the body, (which last are very 
minute,) with an elevated tube on each, the tubal pore, however, being most 
distinct on the middle or second line. In its general form, and in the large 
number of dorsal spines, this genus resembles Clinus: the form of the head and 
mouth are for the most part similar; also all the parts of the gill-cover; as well as 
the branchial membrane, which is six-rayed and free all round. The tags at the 
tips of the dorsal and anal spines are very conspicuous, and give those fins some- 
what of a dabriform appearance. 
It is not improbable that the Clinus littoreus of Cuvier and Valenciennes, which 
they have characterized from a drawing and description in the Banksian Library, 
and which is said to possess twenty-five spines in the anal fin, may belong to this 
new genus. It is observed by those authors, in reference to its peculiarity in this 
respect, that such a circumstance, if correct, would be unexampled, and would 
tend to separate it from the genus in which they have placed it. It is also worth 
remarking that the C. Uittoreus comes from New Zealand, the same country as 
that whence Mr. Darwin obtained the above. 
In the circumstance of having three lateral lines, this new genus seems to 
have some affinity with Chirus of Steller ; but the scales are not ciliated as they 
are said to be in this last, neither are the ventrals five-rayed. 
ACANTHOCLINUS Fuscus. Jen. 
Prate XVIII. Fig. 2. 
Form.—Body elongated and compressed ; the depth, which varies but little, one-sixth of the entire 
length; thickness in the region of the pectorals rather more than half the depth. Head con- 
tained very little more than four times in the length. Profile sloping but very little. Snout 
rather short: mouth protractile, and rather wide: lips somewhat fleshy and reflexed. Gape 
reaching to beneath the anterior part of the orbit, but the maxillary, which is dilated at its 
