6o Bumakaira nigra Nakamura 



In Japanese Kurokajiki or kurokawao 



Figure 22o— Black marline 



The first dorsal fin has 40 to 46 rays^ the first 3 of them 

 spinesg the following 14 to 16 rays with branched tips,- and the 

 remaining posterior rays spinouso The second dorsal fin has 7 soft 

 rayso The first anal fin has 2 spines and 14 soft rayso The second 

 anal fin has 7 soft rays. The ventral fins have 1 spine and 2 soft 

 raySo The vertebral count is 11 / 13 s 24o 



Body length is 2.8 times the head length, 4., 6 times the greatest 

 body depthj and 5=7 times the body depth at the insertion of the first 

 anal fin. The head length is about lo5 times the snout length sind 

 about 5o 7 times the interorbital spaceo The snout length is 2o5 times 

 the length of the head excluding the snouts The length of the head 

 excluding the snout is about 4 times the diameter of the eye,, The 

 distance between the eye and the insertion of the first dorsal fin is 

 4o2 times the diameter of the eyeo The greatest body depth is 5o9 

 times the depth of the caudal peduncle,, The ratio of length of upper 

 to lower jaw is 2o2 



The body is elongatedo The body depth is great i, the degree of 

 lateral compression is slight <, and the caudal region is almost cylindri = 

 cal in shape. The body depth at the insertion of the first dorsal fin 

 is comparatively greater than in other specieso There are two keels on 

 each side of the caudal peduncleo As the upper jaw is rather long and 

 the lower jaw is short, the head tapers sharply to a pointo The gill 

 membranes are short „ The body is covered with bony„ slender scales 

 buried in the skinc The lateral line is extremely obscure j and of the 

 complex form described under the characteristics of the genusn The 

 longest ray of the first dorsal fin is the 5tho Its height is con= 

 spicuously less than the body depth, the body depth being lo5 times 

 the height of the first dorsal fin. Posterior to its 6th ray, the 

 first dorsal fin gradually decreases in height j, and its posterior rays 

 are extremely shorto The pectoral fins are well developed, hardly at 

 all falcate, and their length is roughly equal to the body depth. The 

 ventral fins are poorly developed and shorter than the pectoral finso 

 The first anal fin is rather well developedo The second dorsal fin and 

 the first anal fin are almost the same shape and size^ and are located 

 approximately opposite each other^ Both lobes of the caudal fin are 

 narrow, and the angle formed by them is greato 



Both jaws have rasp-like teeth, but the palatine teeth are 

 vestigial o The branchiostegals are rather shortc The vertebrae are 

 rather short, and the neural and haemal spines are conspicuously 



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