68 



PROCEEDINGS OF THE ACADEMY OF 



[Jan., 



its length; depth of head If; mandible 2; fourth erect dorsal spine 2; 

 snout 3 in head, measured from its own tip; maxillary 2^; orbit 3^; 

 interorbital space 4^; ventral 2; least depth of caudal pedunch' 7: 

 depth of largest keeled scute in lateral line 5. 



Body elongate, slender, fusiform, greatest depth apparently near 

 origin of soft dorsal, and profiles similar. Least depth of caudal 

 peduncle nearly ^ its length. 



Head compressed, lower profile more full and steeper than upper. 

 Snout long, compressed, and with a slight convex protrusion in front. 

 Eye large, orbicular, with a well-developed adipose eyelid covering at 

 least its posterior f , circular, high, and a little anterior in head. Mouth 

 a little inclined, and mandible well jjrotruded in front of upper jaw. 

 Upper edge of maxillary entirely slipping under edge of preorbital, 



Fig. 4. — Trachurus mediterraneus (Steindacliner). 



reaching about opposite front margin of eye, and its distal expanded 

 extremity about equal to pupil. Small teeth uniserial in jaws. A 

 small series of teeth across vomer and also a single series on each pala- 

 tine. Tongue elongate, slender, free, rounded at tip and with a single 

 asperous median patch posteriorly. Nostrils adjoining, and much 

 nearer upper front rim of orl^it than tip of snout. Interorbital space a 

 little elevated and with a median keel from internasal space to occiput. 



Gill-opening extending forward not quite to nostril. Rakers 16 + 38? 

 slender, equal to | of orbit. Filaments only about | length of longest 

 rakers. Pseud obranchiae a little smaller. Isthmus compressed, its 

 lower surface with a median groove. 



Scales small, extending well on head posteriorly, cheek, and opercle 

 at least above. No scales now on anterior bases of rayed dorsal and 

 anal. A large scaly flap behind axil of pectoral. Scutes in lateral 

 line broadest along middle of keeled straight portion, those along side 



