268 Mr. C. T. Regan on the 



entirely of flexible spines; caudal with about 13 principal 

 rays ; pelvics absent. Mouth not protractile ; prsemaxil- 

 laries fixed; maxillary entering the gape; jaws with conical 

 canines anteriorly ; strong molar teeth at the sides of tiie 

 lower jaw and on the vomer and palatines ; pterygoid con- 

 necting palatine with quadrate. Parietals separated by the 

 snpraoccipital ; exoccipital condyles separate. Post-temporal 

 simple, the lower fork represented by a ligament ; no post- 

 cleithra; hypercoracoid and hypocoracoid well developed, 

 widely separated by cartilage ; radials plate-like, not 

 elongate (fig. 1, B). 



Anarrhichas and Ayiarrhkhthys, with a few species, are 

 large fishes of the noithern seas. In Anarrhichas lupus I 

 coimt 77 vertebiee (26 + 51), and in the eel-shaped Anar- 

 rhichthyfi, with about 250 dorsal rays, there are probably 

 about 250 vertebrae. 



L. A. Adams (Bull. Univ. Kansas, 1908, pp. 331-355, 

 pis. xxv.-xxxvi.) has givem a detailed description of the 

 skull of Anarrhichthys. Anarrhichas is very similar, and 

 both show considerable resemblance to Bknnius in cranial 

 structure. 



Family 3. Congrogadidae, 



Body covered with small scales. Caudal of 9 or 10 rays, 

 joined to the dorsal and anal ; all the fin-rays articulated, 

 or the first of the dorsal spinous ; pelvics, if present, jugular, 

 1- or 2- rayed, appearing as a pair of filaments. Mouth pro- 

 tractile, with strongly developed lips; maxillary excluded 

 from the gape ; jaws with a single series of conical or some- 

 what compressed teeth ; palate usually toothless. Palatines 

 separated by the vomer ; pterygoid unconnected with palatine 

 or mesopterygoid, curved backwards above the quadrate 

 (fig. 2, B). Parietals separated by the snpraoccipital ; ex- 

 occipital condyles almost contiguous. Post-temporal forked ; 

 hypercoracoid and hypocoracoid in contact, rather narrow ; 

 radials small^ hourglass-shaped. 



Synopsis of the Genera, 



I, No dorsal spine ; gill-iuembranes united, free from the Istlinuis ; 



6 brancbiostegals ; lateral line incomplete ; no pel\ ic tins. 



1. Conyrotjadus. 



II. First dorsal ray a short spine; gill-membranes joined to the 



isthmus; 4 branchiostegals. 



Lateral line incomplete ; pelvic tins present '2. lilemiochsvms. 



Lateral line complete ; no pelvic fins tJ. Haliophis. 



Three lateral lines ; pelvic tins present 4. Halidesmus. 



