NOMENCLATURE AND MORPHOLOGY. 73 



on the jaws, front of vomer, and palatine bones. Tongue 

 smooth. Cheeks and opercular apparatus scaly. Branchial 

 apertures continuous under the throat. Two dorsal fins contig- 

 uous upon their base. Three small anal spines. Insertion of 

 ventrals on a line immediately behind the base of pectorals. 

 Caudal fin posteriorly sub-cresentic. Scales Avell developed and 

 posteriorly ciliated." — (Girard, JJ. S. Pac. R. R. Surv. X, 

 Fishes, 4, 1858.) 



Grystes Giinther, 1859. — " Six or seven branchiostegals. 

 All the teeth villifbrm without canines ; teeth on the palatine 

 bones ; tongue smooth. One dorsal, with ten spines, the anal 

 fin with three. Operculum with two points, prseoperculum with 

 a single smooth-edged ridge. Scales moderate. The number 

 of the pyloric appendages increased. Air-bladder simple, 

 slightly notched behind." — (Gunther, Cat. Fishes Brit. 3Ius. I, 

 252, 1859.) 



HuRO Giinther, 1859. — " Six branchiostegals. All the teeth 

 villiform, without canines; palatine bones ?; tongue ? Two 

 dorsals, the first with six, the anal fin with three spines.' No 

 denticulations on the bones of the head; operculum with two 

 flat obtuse points. Scales moderate." — (Gunther, Ckd. Fishes 

 Brit. Mm. I, 252, 1859.) 



MiCROPTERUS Gill, 1873. — " Body ovate-fusiform, compressed, 

 deepest behind the ventrals, with the caudal peduncle elongated, 

 scarcely contracted towards the base of the fin. 



"Scales small or moderate; quadrate, rather higher than 

 long, with the exposed portion densely muricated, rounded 

 behind and about twice as high as long ; with the fan with few 

 (4-9) folds ; extending to the nape and throat. 



"Lateral line regularly parallel with the back, in scales 

 nearly like but smaller than the adjoining ones. 



" Head compressed and oblong conic, with the lower jaw 

 prominent and the profile rectilinear ; with scales (more or less 

 smaller than those of the trunk) on the cheeks, operculum, sub- 

 7 



