APPENDIX. 3o3 



Fam. EMBIOTOCID.E.* 



(Gunther: Fishes, Vol. IV. p. 245.) 



Body compressed, elevated, or oblong, covered with 

 cycloid scales. Lateral lines continuous. One dorsal 

 fin, with a developed spinous process, and with a scaly 

 sheath along the base, which is separated by a groove 

 from the other scales ; anal with three spines and nume- 

 rous rays. Ventral and thoracic fins with one spine and 

 five soft rays. Tusk in the jaws small ; palate smooth. 

 The lower pharyngeal bone triangular. Branchiostegals, 

 five or six. Grills, four pseudo-branchiae, well developed ; 

 air-bladder large, simple. Stomach without csecal 

 appendage; pyloric appendage, none. Viviparous. 

 Vertebrae 17 20. (Ditrema aggregatum.} 



Synopsis of Genera. 



Dorsal spines . . 7 11 . . 1. DITREMA. 

 Dorsal spines . . 1618 . . 2. HYSTEROCABPUS. 



DITREMA. 



Body compressed, elevated, covered with cycloid 

 scales of moderate or rather small size ; mouth rather 

 small ; teeth conical, in a single series. One dorsal fin, 

 the spinous portion of which is less developed than the 

 soft, and composed of seven to eleven spines ; anal with 

 three spines and numerous closely-set rays. Gills, four, 

 with a cleft behind; pseudo-bran chia3 well developed. 



Ditrema. 



Jacksoni. 



laterals. 



Temminckii. 



vacca. 



toxotes. 



Ditrema. 

 Caryi. 



aggregatum. 

 furcatum. 



brevipinnes (Gunther : nov. 

 sp. Fishes, Vol. IV.). 



* Vide Viviparous Fishes, Vol. I. 

 VOL. II. A A 



