SS6 PHILOSOPHY OF ZOOLOGY. 



44. Esox. Pectoral fins of the ordinary size. M. Cu- 

 viER has given indications of the following sub-genera : 

 1. Esox (E. lucius). 2. Galaxias {E. truttaceus). 3. Mi- 

 crostoma {M. vulgaris, the Serpe niicrostome of Risso). 

 4. Stomias (jE. hod). 5. Chauliodus {E. stomms). 6. 

 Salanx (one new species, Cuv.). 7. Belone {E. belone). 

 8. Scomberesox {E. saurus). 9- Hemiramphus {E. hra- 

 siliensis). 



45. ExocETUs. Pectoral fins greatly developed, and 

 fitted for temporary flight. E. volitans. 



46. MoRMYUus. Snout produced, mouth small. Gill- 

 flap hid. 31. anguilhides. 



CyprinidjE. Jaws and teeth feeble. The plates of the 

 pharynx thickly set with teeth. Stomach destitute of a 

 pouch, and the intestines without coeca. 



47. Cyprinus. Mouth small, jaws, tongue and palate 

 without teeth. The gill-flap with three rays. The fol- 

 lowing subgenera have been indicated by Cuvier : 1. 

 Cyprinus (C carp'io). 2. Barbus (C harhus). 3. Gobio 

 (C. gobio). 4. Tinea (C. tinea). 5. Cirrhines (C cir- 

 rhoSKs). 6. Abramis (C. brama). 7. Labeo (C. niloticus). 



,8. Leuciscus (C leuciscus). 9- Gonorhynchus (C gono- 

 rhynchus). 



48. GoBiTis. Lips fleshy, and fit to act as a sucker. 

 Air-bag contained in an osseous case. G. harhatula. 



49. Anableps. Iris double, ovoviviparous. A. tetroph- 

 thalmus. 



50. PocEiLiA. Three rays in the gill-flap. P. vivi- 

 'para. 



51. Lebtas. Five rays in the gill-flap. L. pacijica. 



52. Cyprinodon. Four rays in the gill-flap. C. va- 

 riegatus. 



SiLURiDiE. The maxillaries are greatly reduced or 

 lengthened into filaments. 



