282 ACANTHOPTERYGII. 



C. Amblyopina.* Vertical fins united, a single dorsal occupying the whole length of the back. 



10. Gobioides. Anterior teeth very strong : no cavity above the opercle. Scales, when present, 

 rudimentary. 



11. Trypauchen. Several rows of teeth in each jaw, the outer the longer. No canines. A cavity above 

 the opercle. 



A. Gobiina. Ventrals forming a disk, being united along their whole extent or in their basal 



halves. Two separate dorsal fins. 



Genus, 1 — GoBrus,f Artecli. 

 Branchiostegals five : pseitdobranchice. Gill-openings of moderate ividth. Bodij low and elongated. Opercles 



* Ambltopodifokmes, Bleeker, is thus primarily divided — 



1. AmbVyopodini, B. v, body very elongate, no post-temporal fossa. 



2. Trypauchini, B. iv, several rows of teeth in either jaw, the outer row the longer and very sharp, internal row of a 

 conical grain shape. A post-temporal fossa. 



f Although in my opinion minutely sub-dividing this large Genus will not conduce to aiding the enquirer in determining 

 the species of a specimen, still I consider it necessary to give a synopsis of Bleeker's elaborate paper on the dentition of the Gobiini, 

 many of which fishes are included in Genus Gobius, Artedi. 



Gobiini : — Teeth in jaws simple, their apices being neither clubbed nor incised : in one or two rows in upper, in two or more 

 in lower, jaw. 



I. Brachygobii. No canines. 



1. Lophogobius, Gill. Body compressed. Teeth in both jaws in many villiform rows, the outer the longer. Scales 

 ctenoid. 



II. Platygobii. Teeth in many rows in both jaws. No true canines. 



2. Gillichthys, Coop.= GilUa, Giinther. Teeth villiform in both jaws. Scales small, cycloid. 



3. Qobiopsis, Steind. Teeth, the outer row the larger. Scales large, ctenoid. 



4. Glossogobius, Gill= Cephalogobius, Bleeker. Outer row of teeth the longer, curved, not crowded together, unequal. 

 Upper jaw not produced posteriorly. 



5. Platygobius, Bleeker. Teeth, outer row in premaxillaries scarcely enlarged, in the lower jaw not enlarged. 

 III. Eugobii. Teeth in jaws fixed. 



a. Teeth in both jaivs sharp, in many rows, with the outer one enlarged, : no canines. 



6. Gobius, Arte<ii=Pomatoschistus, Gill. Teeth in the outer row conical and subequal : caudal obtuse. Scales ctenoid. 

 Abdomen scaled. Snout short. 



7. Acanthogobius, Gill. Teeth in the outer row subequal : caudal obtuse. Scales ctenoid. Snout conical. 



8. Brachygobius, B\eaker=Hypogymnogobius, Bleeker. Teeth in the outer row subequal. Abdomen scaleless. 



9. Eucyclogobius, Gill. Teeth in the outer row subequal. Scales cycloid, none on the head. 



10. Lepidogobius, Gi\l=Cyclogobius, Steind. Teeth in the outer row subequal. Scales cycloid. Head scaled. 



11. Callogobius, Bleeker. Teeth in the outer row, slender, subequal. Caudal lanceolate. Head depressed, convex. 



12. Stenogobius, Bleeker. Teeth in the outer row, conical, subequal. Caudal obtusely lanceolate, longer than the head. 



13. Actinogobius, Bleeker. Teeth in the outer row unequal. Caudal acute, shorter than the head. 



b. Teeth in each jaw in many rows, the outer the longer : some truncated,. 



14. Hemigobius, Bleeker. Some of the middle teeth of the outer row in the premaxillaries truncated. 



c. Teeth in each jaw in many roivs, pointed, subequal, the outer row erect and not elongated. No canines. 



15. Awaous, Val. Scales 50 to 60. 



16. Bhinogobius, Gill=Chonephorus, Poey. Scales 28. 



d. Teeth in either jaw in many pointed rows, the outer the longer : in the lower jaw laterally a posterior curved canine. 



17. Ctenogobius, Bleeker. Head scaleless. Scales 14 to 30. 



IS. Centrogobius, Bleeker=Oploj:>omws, Steind. First dorsal spine pungent. 



19. Acentrogobius, Bleeker= Porogobius, Bleeker. Head scaled. No pungent dorsal spine. Caudal lanceolate. 



20. Amblygobius, B\eekev=Odontogobius, Bleeker. Scales 52 to 56. 



21. Cryptocentrus, ~Ehr.=Pargobius, Bleeker. Scales 85 to more than 100. 



e. Teeth in both jaws pointed, and in two rows. 



22. Zonogobius, Bleeker. Outer row of teeth in upper and inner in lower jaw the longer. 



23. Lophiogobius, Giinther. Teeth in two rows in each jaw, the outer row the longer, placed wide apart and sub-horizontal. 

 No canines. 



/. Teeth pointed, in one or less than two rows in the upper and many in the lower jaw. Canines present or absent. 



24. Stigmatogobius, Bleeker. Teeth in one row in the upper jaw : outer row in the lower jaw the longer, and posteriorly 

 above the symphysis two canines. 



25. Euctenogobius, Gill. A single row of teeth in the premaxillaries, few rows in lower jaw : no canines. 



26. Ovyurichthys, TileekeT.=Gobv,chthys, Klunz. Teeth in premaxillaries in one or less than two rows, the inner of 

 which is rudimentary: many rows in the lower jaw, the outer being the longer : no canines. Caudal lanceolate. 



IV. Ghceturichthyi. No canines : barbels on lower jaw. 



27. Ch&turichthys, Rich. Teeth in two rows in either jaw, the outer row close together, the loDgest, and consisting of fixed, 

 curved, subulate teeth directed obliquely inwards. 



28. Amblychceturichthys, Bleeker. Teeth in the premaxillaries in few rows, the outer the longer, fixed, straight, subulate : 

 three or laterally two rows in the lower jaw, the outer the longer, moveable, straight, and directed obliquely inwards. 



29. Parachxturichthys, Bleeker. Many rows of teeth in both jaws, the outer row close together, consisting of elongated, 

 straight, and fixed ones. 



V. Gobionelli. Teeth in both jaws in many rows. 



30. Synechogobius, Gill. Pointed fixed teeth in both jaws, the outer the longer. 



31. Gobionellus, Gir.—Samaragdus, Poey. Teeth small, the outer row setaceous and moveable. 



