W. S. MacLeay on the Natural Arrangement of Fishes, 201 



By means of Polynemus we pass from Scicsna to the Cirrhitidce, 

 which differ from the Percidce in having in general either more or 

 less than seven branchial rays, and from the Sparidce in having teeth 

 generally on the palatines. The Cirrhitidce, however, differ from each 

 other very much in form, as may be seen by the following genera, 

 which are clearly of the rank of families : — 



Two dorsals. 



1. Polynemus, Linn. Two dorsals distinct. Ventrals sub- 



abdominal. 



2. Mullus, Linn. Two dorsals distinct. Ventrals sub- 



pectoral. Branchial rays less than 

 seven. 



a. Trachinus, Linn. Two dorsals united. Ventrals sub- 



jugular. Branchial rays more than 

 seven. 



One dorsal, ventral fins subpectoral. 



4. Beryx, Cuv. Branchial rays more than seven. 



5. Cirrhites, Conem. Branchial rays less than seven. 



By means of Trachinus we return among the Scorpcenidce, from 

 which we set out, so that the circle of PERCIN A is completed. We 

 now therefore proceed to the next tribe, FISTULARINA, which we 

 enter by reason of the affinity reigning between the Chcetodontidce and 

 Scombridce, as displayed in such genera as, for instance, Brama and 

 Coryphcena. 



Probable genera of the Scombridce, or family S comber oides of 

 Cuvier. 



Body regular and pisciform. 



1. Coryph^na, Linn. 



2. Xiphias, Linn. 



3. Scomber, Linn. Leading off by Thyraites to Lepidopus. 



Body laterally compressed and vertically elevated. 



4. Stromateus, Linn. Ventrals inconspicuous. 



5. Zeus, Linn. Ventrals conspicuous. 



By Lepidopus w r e enter among the Fistularidce, or long eel-shaped 

 Acanthopterygians, which may be arranged as follows : — 



TJENOIDES, Cur. One long dorsal. Cranium not produced into a tube. 

 Body tolerably compressed. 



1. Leridopus, Gouan. Muzzle elongated; mouth consider- 



ably cleft, and a caudal fin present. 



2. Cepola, Linn. Mouth considerably cleft; nocaudalfm. 



3. Gymnetrus, Bl. Muzzle elongated, mouth small, cau- 



dal fin present. 

 FISTULARIDES, Cuv. Cranium produced into a tube. 



4. Centriscus, Linn. Body oval, compressed; scales con- 



spicuous ; dorsals two. 



5. Fistularia, Linn. Body elongated, cylindrical ; scales 



small ; only one dorsal. 



By Aulostomus we return to Lepidopus, and by means of Gymnetrus 

 and one of its subgenera, Murcenoides, we pass to the Gobioidce, a 

 family easily known by the extreme length and tenacity of their dorsal 



Ann. $ Mag, N. Hist, Vol, ix. P 



