274 Cavallas and Pampanos 



are known as Ao, or bluefishes. Seriola lata is fossil in the 

 mountains of Tuscany. 



The runner, Elegatis bipinnulatus , differs from Seriola in 

 having a finlet behind dorsal and anal. It is found in almost 

 all warm seas, ranging north once in a while to Long Island. 



The mackerel scads (Decapterus) have also a finlet, and on 

 the posterior part of the body the lateral line is shielded with 

 bony plates. In size and form these little fishes much resemble 

 small mackerel, and they are much valued as food wherever 

 abundant. Decapterus punclatus, known also as cigar-fish and 

 round-robin, frequently visits our Atlantic coasts from the West 

 Indies, where it is abundant. Decapterus russelli is the Maru- 

 aji, highly valued in Japan for its abundance, while Decapterus 

 muroadsi is the Japanese muroaji. 



Megalaspis cordyla abounds in the East Indies and Poly- 



FIG. 215. The Saurel, Trachurus trachurus (Linnaeus). Newport, R. I. 



nesia. It has many finlets, and the bony plates on the lateral 

 line are developed to an extraordinary degree. 



In Trachurus the finlets are lost and the bony plates extend 

 the whole length of the lateral line. The species known as 

 saurel and wrongly called horse-mackerel are closely related 

 and some of them very widely distributed. 



Trachurus trachurus common in Europe, extends to Japan 

 where it is the abundant maaji. Trachurus mediterraneus is 

 common in southern Europe and Trachurus symmetricus in 

 California. Trachurus picturatus of Madeira is much the same 



