388 KAMAKIcm KISHINOÜYE: 



macroptents in the Gist aud second years seems to be nearly the same as that 

 of the common timny ; but in the yoimg form of T/mnmis germo reticulating 

 longitachual bands are foimd, instead of transverse bands. 



Tlie smallest specimen of Katsinoonus jxlamis in my collection is 21 cm. 

 in tlie total length. It has a, slenderer body than the adult, three dark 

 obhque mai'kings at the back of the caudal portion, and one faint longitudiaal 

 band under the lateral Ime. This specimen was caught in August, 1916, at 

 Okinawa-ken, and seems to have been a fish hatched during the same year. 

 The smallest specimens of Euthjnnus yalio in my possession are 13 cm in the 

 total length. One of them was sent by IMi'. Gobee. It was collected by the 

 SS " Gier " in November, 1907. The other specimen was collected near 

 Keelung, Taiwan, in 1919. They are very slender aud have eight or more 

 transverse bands on the side. These bauds are nearly vertical and fade toward 

 the ventral median hue. When they giwv to a total length of 19 cm the body 

 becomes very broad, the thoracic spots ap^joiir, the bands gradually disappear 

 from the ventral pai-t, and the dorsal part of the bands becomes oblique. 



Mr. S. ToMiNAGA sent me several immature specimens of Avxis maru, 

 which he obtained from the stomach of striped bouitos, caught off Awakunijima, 

 Okinawa-ken (Ryukyu). They measm'e 11-17 cm. in length. Tlie largest 

 specimen is nearly the same form as the adult, but the specimens, 11-13 cni 

 in lengtli, are remarkably slender. The skin is more or less daimaged by 

 gastric juice, and the markings are not foimd in these small specimens, but 

 in the largest specimen, there seem to te some ti-ansverse bands. They were 

 collected on July 10, 1921. 



LOCOMOTION. 



About the locomotion of the fishes of the Scombridae and Cybiidae there 

 is nothing new or pecuhar. It is quite similar io thjxt of other teleosts. 

 Swift and unceasing locomotion is, however, characteristic of the Plecostei. 

 It is impossible for fisliing boats, running about 10 knots an hour, to 

 accompany a school of the striped bonito in progi'ess, so that fishermen 

 throw out live baits to attract and thus to n>tard or stop the progress of the 

 school. Plecostean fish scarcely bend their Ixxly in locomotion, except the caiidiU 

 peduncle, as will easily be understood fi"om the fcjrm and construction of the 



