442 PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXV. 



b. Dorsal divided into three fins; scales ctenoid; rather large Irlpteri/gkm, 1. 



bb. Dorsal fin continuous; scales small; shoulder girdle without hook; maxillary 



normal; mouth large Zacalles, 2. 



ua. Body scaleless; species viviparous; teeth cvmb-alutped, m a single row; vomer and 



palatines toothless, or nearly so; lateral line usually arched in front; soft dorsal 



about equal to spinous. 



c. Blermi'mve: Teeth all fixed, attached to the bones of the jaws; carnivorous. 



d. Gill-opening relatively large; caudal rounded; gill membranes broadl}- 



united, nearly or quite free from the isthmus; one or both jaws with 



posterior canines Blemiiiifi, 3. 



dd. Gill-opening reduced to a small slit; one or both jaws with posterior 

 canines; caudal rounded or angular. 



e. Dorsal elevated in front Petroscirtes, 4. 



ee. Dorsal not elevated in front Aspid.onius, 5. 



cc. Salarihue: Teeth all movable, implanted on the skin of the lips; herbivorous. 

 /. Posterior canine wanting. 



g. Dorsal continuous SaJarias, 6. 



gg. Dorsal deeply divided >ScarUr]il1iiifi, 7. 



II. Blennies, arctic or sul)arctic; the vertebne in large number, 50 or more; lateral 

 line various; scales small, cycloid, rarely wanting. 



/(. Gill-membranes not continued forward below, the membranes 

 broadly united, sometimes joined to tlie isthmus; ventral fins 

 small or obsolete. 

 i. Pectoral fins relatively short or wanting, never pointed, and not 

 more than half as long as head; pyloric ca?ca few or none. 

 j. Body not covered with crosswise tubes running at right angles 

 to the lateral line. 

 k. Dorsal fin composed of spines only. 



1. Chirolophbuc: Ventral fins well developed, I, 3; gill mem- 

 branes free from isthmus. 

 m. Lateral line obsolete, represented anteriorly by a row 

 of pores; top of head covered with matted cirri; 

 teeth in two rows so aligned as to form a cutting edge. 



n. Head scaly Azuma, 8. 



nn. Head naked Bryoatemmn, 9. 



If. Ventral fins rudimentary or wanting, not more than one 

 soft ray present; dorsal spines short and rigid. 

 0. Pholidiniv: Lateral line obsolete; carnivorous. 

 p. Ventral fins reduced to a single spine, witli a 

 rudimentary ray; anal spines small. 



q. Head scaly Enedrias, 10. 



qq. Head naked. 



r. Caudal fin well developed Pholis, 11. 



rr. Caudal fin very slender, coalescent with dor- 

 sal and anal Gunnellops, 12. 



jip. Ventral fins wanting; no anal spine; top of head 

 with fieshy crests; body partly naked; gill- 

 membranes forming a fold across the isth- 

 mus Alectrias, 13. 



kk. Dorsal fin with its posterior part composed of numerous 

 soft rays; no lateral line; no ventral fins. 



s. Eulopliimve: Scales wanting; body greatly 

 elongate, the dorsal fin with about 120 

 spines and about 12 soft rays. 



Eulupliias, 14. 



