118 NEW-YORK FAUNA. 
GENUS PALINURUS. 
Preopercle serrated, with spines on its margin. Opercle with one or more flat spines, more 
or less distinctly serrated beneath. Anal with one or more spines in front. Teeth small, 
pointed, subequal. Body compressed, oblong. The anterior portion of the single dorsal 
spinous. 
Oxs. I propose this genus for the reception of two species from our coast, which, although 
allied in many particulars to the genus T’rachinotus, differ from it in others. The anterior 
dorsal spines are certainly not free, and the pointed and serrated gill-covers indicate a still 
farther removal from that genus. The name has been applied, as I am aware, to a genus of 
crustacea, but is otherwise unobjectionable. Should this genus be adopted, a question arises 
whether it should remain in this family. As the characters of Scombride now stand, it can- 
not, but they will doubtless be revised by competent hands. 
THE BLACK PILOT. 
PALINURUS PERCIFORMIS. 
PLATE XXIV. FIG. 25.—(STATE COLLECTION.) 
Rudder-fish, or Perch Coryphene. Murcuttt, Lit. and Phil. Soc. Vol. 1, pl. 16, fig. 7. (No description.) 
Coryphena perciformis. Ip. Am. Monthly Magazine, Vol. 2, p. 244. 
Trachinotus argenteus, STORER, Mass. Report, p. 55. (Non Cuv.) 
Characteristics. Bronze-black. The dorsal spines much lower than the soft rays. Length 
nine inches, 
Description. Body oblong, elliptical, compressed. Height nearly equal to one-third of its 
length. Scales moderate, rather small, subquadrate, the free margins entire ; free surface 
concentrically striate, plaited behind. They ascend high up on the membrane of the vertical 
fins, where they become very minute. ‘The lateral line, composed of a series of short tubes, 
commences at the upper angle of the branchial aperture, is arched and nearly concurrent with 
the back, from which it is little distant. The scales containing the lateral line are notched 
behind, the tube being elevated in front. Head declivous, somewhat rounded. In cabinet 
specimens this part is subcarinate, and the supraorbital prominent, with from four to six dis- 
tinct elevations. Length of the head to the margin of the opercle, 2°2. Snout blunt. Eyes 
large, prominent, 0°6 in diameter. Nostrils double; the posterior very large, rounded. Opercle 
with a pointed membrane, and a flat acute membranous spine with delicate denticulations along 
its rounded angle, becoming gradually effaced beneath ; above this pointed membrane is a deep 
emargination, with a blunt spine above. Preopercle with from thirty to thirty-five subequal 
short spines, forming distinct ridges within the margin, and giving this bone on its outer surface 
a plaited and radiated appearance. Jaws subequal, the lower shutting within the upper ; with 
a single series of small, equidistant, subequal, conic, acute, slightly recurved teeth in both. 
