12 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 6G 



Family THUNNIDAE 

 Genus THUNNUS South 



THUNNUS THYNNUS (Linneaus), Ahi. 



This great Tunny or Tuna of Hawaii and Japan, possibly distinct 

 from Thunnus thynnus of the Atlantic, grows to a very large size, 

 one individual having' been seen weighing 580 pounds; unfor- 

 tunately fins and finlets had been removed. As in the young of the 

 Tunny, immature individuals of 3 feet in length or less have the 

 sides marked by narrow cross-streaks of dull silver, broken up below 

 into whitish spots. 



Pectorals reaching tw^o-thirds distance to anal and falling an 

 inch short of soft dorsal, li/^ in head, not edged with darker; dorsal 

 lobe 2% in head, its edge as well as that of anal darker ; finlets 7/7, 

 dull yellow, clearly edged with black. 



In Japanese specimens, called Thunnus orientalis, Doctor Jordan 

 found the dorsal finlets bluish, the anal dull yellowish, the finlets 8/9, 

 gill rakers below 13, dorsal spines XIII to XV. Steindachner's 

 Orcynus schlegeli is the young of the species. 



The only distinction apparent between Thunnus orientalis and 

 Thunnus thynnus seems to lie in the color of the finlets, which, in 

 T. thynnus, are dark bluish, colored like the back. Perhaps they 

 grow darker with age. 



The European Tunny {thynnus) has the finlets 8 or 9 above, 7 

 or 8 below. 



Genus GERMO Jordan 



GERMO ALALUNGA (Gmelin). 



(Scomber ycrmo Lacepede ; Thynnus pacficus Cuvier aud Valenciennes.) 

 The common Albacore has the finlets bluish, without trace of 



yellow. It was not observed by me, but is recorded as seen by Jordan 



and Jordan in 1921. 



Germo argentivitattus (Cuvier and Valenciennes), mentioned by 



Jordan and Jordan, should be dropped from the list. The specimen 



noted by Mr. Nichols was obtained by Dr. Evermann in Peru, 



Genus PARATHUNNUS Kishinouye 



PARATHUNNUS SIBI (Schlegel). 



{Parathutmus mebachi Kishinouye.) 



This species much resembles Neothunnus macropterus, but the 

 dorsal finlets, yellow in the center, are broadly margined with black 

 with a narrow edge of white; the long posterior tip is black. The 

 anal finlets are not yellow, but blackish with a whitish edge, the 

 center sometimes faintly yellow-shaded. Dorsal and anal lobes mod- 



