410 U-S. NATIONAL MUSEUM BULLETEST 2 02 Vol. 2 



Head depressed, snout with steep profile, slightly concave just in 

 front of and between eyes; premaxillary retracts so that snout tip and 

 front of premaxillary are equal; teeth in a villiform band in both jaws, 

 this band widest at front of jaws; vomer and palatines edentulous; 

 no free dermal flap at rear of opercle; preopercular spine moderately 

 elongate, with 2 dorsally directed spines and the terminal preopercular 

 point curved a little upward on one side, straight on the other; no 

 antrorse basal spine on preopercular spine; gill opening a small fora- 

 men on dorsal side of opercle; the membrane connecting pelvic with 

 pectoral base joins opposite eleventh or twelfth rays downward from 

 dorsal edge of pectoral fin; lateral line single and simple, running a 

 dorsally located course ; maxillary at rear edge not semitubular with a 

 lobe; no orbital tentacle. 



Color in alcohol. — Background color pale brownish, head and body 

 spotted everywhere with numerous small, distinct dark brown spots; 

 under side of head light brownish; cheeks with a few brown spots; 

 pelvic fin with two brownish cross bands and some brown specks; 

 pectoral irregularly barred ; spiny dorsal with alternating vertical pale 

 and black streaks; soft dorsal with lengthwise dark brown or black 

 streaks; anal and caudal fins barred with dark brown spots; pectoral 

 base blackish. 



Ecology. — This specimen was found in 20 to 40 feet of water, over a 

 sand and coral-head bottom. 



Remarks. — This species is nearest ocellatus but differs in lacking black 

 ocellated spots in the dorsal fin and lacks the distinct brown and white 

 bars on the body found in that species. The membrane from pelvic 

 fin connects opposite base of the eleventh and twelfth pectoral rays 

 from dorsal edge in morrisoni instead of the seventh to tenth as in 

 ocellatus. Soft dorsal rays 8, and anal 7, in morrisoni whereas in laddi 

 they are 9 and 8 respectively. 



Named in honor of Dr. J. P. E. Morrison, associate curator of 

 mollusks, U.S. National Museum, who spent the summers of 1946 and 

 1947 at Bikini. 



Suborder Scombrina 



Family SCOMBRIDAE: Tunas 



By Leonard P. Schultz 



The following key should be useful in identifying the tuna and tuna- 

 like fishes of the northern Marshall Islands: 



la. Two lateral lines; dorsal rays about XII, III, 6 to 8-7; anal about 111,8 or 

 9-6; pectoral rays ii,23 or 24; gill rakers about 4+1 + 15; vomer, pal- 

 atines, and tongue with a large patch of villiform teeth. 



Qramiriatorcynus bilineatus (Riippell) 



