490 GOBIESOOID^. 



Synojjsis of the Genera. 



* The posterior division of the adhesive disi: without free anterior margin. 



Three gills and a half ; gill-membranes attached 



to the isthmus 1. Ciiohisochismus, p. 4'JO. 



Three gills ; gill-membranes free. Both jaws 



with a single series of incisors 2. Sicyasks, p. 494. 



Three gills; gill-membranes free. None of the 



jaws with incisors 3. Cotylis, p. 497. 



Tlu'ee gills ; gill-membranes free. Several series 



of teeth in the upper jaw, and incisors at 



least in the lower 4. Gobiesox, p. 499. 



** Tlie posterior portion of the adhesive disk with a free anterior niaryin. 



Three gills ; gill-menu)ranes free. Incisors in 



both jaws 5. Diplocrei'is, p. 506. 



Tlu'ce gills ; gill-membranes free. Very small 



villiform teeth in both jaws 6. Crepidogaster, p. 507. 



Three gills and a half; gill-membranes free. 



Very small teeth in both jaws 7. TkacheIiOCHismus, p. 509. 



Three gills and a half ; gUl-membranes attached 



to the isthmus. Very small teeth in both 



jaws. Dorsal and anal fins with the rays 



well developed 8. Lepadogaster, p. 510. 



Thi-ee gills and a half. Dorsal aud anal fins 



without distinct rays 9. Leptopterygius, p. 515. 



1. CHORISOCHISMUS. 



Gobiesox, sp., Cuv. Hhjne Anhn. 



Gobiesox, Mi'ill. i^ Trosch. Hor. lehtht/id. iii. p. 17 (not Lacep.). 



Chorisocliismus, Bi-is. de Barnev. Rev. Zool. 1846, p. 209. 



Anterior part of the body very broad and depressed ; skin tough, 

 naked. Doi-sal fin short, situated on the tail ; ventrals widely apart 

 from each other, composed of a rudimentary spine and four (five) 

 rays ; posterior portion of the adhesive disk without free anterior 

 margin. Jaws with a series of large conical teeth in front, and 

 with broad bands of small ones behind this series. Gills three 

 and a half; pseudobranchiai ; branchiostegals five ; gill-membranes 

 attached to the isthmus. 



Cape Seas. 



1. Chorisochismus dentex. 



Cyclopterus dentex, Pall. Spic.il. vii. p. 6. tab. 1 ; Luc(p. ii. p. 64. 



l^epadogaster dentex, Bl. Schn. p. 2. 



Gobiesox dentex, Cm\ Regne Aiu'm. ; 3Iiill. (Sf Trosch. I. c. 



■ gyriniis, Valeric, in Cuv. Regne Anim. III. Poiss. pi. 108. fig. 1 



(very bad). 



uudus, Bris. de Barnev. I. c. p. 1 45. 



Cliorisochisuius uudus, Bris. de Barnev. I. c. p. 209. 



D. 10. A. 7. C. 10. V. 1/5*. 



Base of the pectoral without a vertical cutaneous fold ; the 



* See, on the struetm-c of the ventral finsi p. 493. 



