268 



Correspondence. 



by reason of the affinity reigning between the Chaetodontidae and Scom- 

 bridae, as displayed in such genera, as for instance, Brama and Coryphaena. 



Probable genera of the Scombridae, or family Scomberoides of Cuvier. 

 Body regular and r 1. Cor.yph.ena, Linn. 

 pisciform. j 2. Xiphias, Linn. 



\ 



l 



I 



3. Scomber, Linn. 



Leading off by Thyrsites to 



Lepidopus. 

 Ventrals inconspicuous. 



Ventrals conspicuous. 



Body laterally com- r4. Stromateus 

 pressed, and ver- <j Linn. 



tically elevated. 15. Zeus, Linn. 

 By Lepidopus we enter among the Fistularidae, or long eel-shaped 



Acanthopterygians, which may be arranged as follows, viz : — 



T7EN0IDES, Cuv. C 1. Lepidopus, Go- Muzzle elongated ; mouth 



One long dorsal. 

 Cranium not pro- 

 duced into a tube 



Body tolerably 

 compressed. 



FISTULARIDES, 



Cuv. 



Cranium produced 

 into a tube. 



i 



nan. 



considerably cleft, and a 

 caudal fin present. 

 Mouth considerably cleft, 



no caudal fin. 

 Muzzle elongated, mouth 

 small, caudal fin present. 

 Body oval, compressed, 

 scales conspicuous, dor- 

 sals two. 

 Body elongated cylindri- 

 cal, scales small, only one 

 [ dorsal. 



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

 and one of its subgenera, Muraenoides, we pass to the Gobioidae, a family 

 easily known by the extreme length and tenacity of their dorsal spines. 

 The following are possibly the genera which generally have a tuber- 

 cular appendage to the anus. 



2. Cepola, Linn. 



3. Gymnetrus, Bl. 



4. Centriseus, 



Linn. 



5. Fistularia, 



Linn. 



Ventrals not 

 racic 



tho- 



Ventrals thoracic, 

 or placed further 

 back than the 

 pectorals. 



r\. Blennius. L. 



2. Anarrhicas. L. 



3. Callionymus. L. 



4. Mugil, Linn. 

 Mugiloides Cuv, 



5. Gobius, Linn. 



Ventral subjugular, consist- 

 ing of only two rays. 

 One dorsal. 



Ventrals none. One dorsal. 



Ventrals subjugular. Two 

 dorsals. 



Ventrals separate. Caecums 

 numerous. Two dorsals. 



Ventrals united at base. 

 Caeca none. Two dorsals 

 sometimes confluent in- 

 to one. 



