Il8 GENERA AND SPECIES. 



Notidanus. Plate xxix. NOTIDANID&. 

 229. griseus, BROWN SHARK. Gill-slits 6. 



There is one dorsal, which is smaller than the ventrals, and 

 placed between them and the anal. The pectorals are close to the 

 gill-slits. The tail is long, with the lower part of the caudal fin 

 highest near the base, and tapering off towards the tip, where it is 

 but little higher than the upper portion, which is of the same height 

 throughout. The colour is grey ; the length over 26 feet. This is 

 a common Mediterranean species, rare in our seas. 



Ophidium. Plate xix. OPHIDIID&. 



143. barbatum, BEARDED OPHIDIUM. Vertical fins continuous ; 

 ventrals, a pair of filaments under throat. 



There is apparently no caudal fin, the long and level dorsal and 

 anal being continuous, and having from 230 to 260 rays. The 

 pectorals have from 20 to 23 rays. The filaments representing the 

 ventrals are bifid. The lateral line is in the upper half of the body. 

 The colour is greyish brown, and the length 10 inches. A Mediter- 

 ranean fish, of which only one specimen is recorded as British. 



Orcynus. Plate vi. SCO M BRIDGE 



39. thynnus, SHORT- FINNED TUNNY. Pectorals not reaching to 



finlets. 



40. germo, LONG-FINNED TUNNY. Pectorals reaching to finlets. 



The Short-finned Tunny has 13 or 14 spines in its first dorsal, i 

 or 2 spines and 13 rays in its second dorsal, and 8 or 9 finlets 

 between the second dorsal and the caudal ; the anal has 2 spines 

 and 12 rays, with 7 or 8 finlets behind it ; the caudal ha from 32 to 

 35 rays, the pectorals have 31, and the ventrals have a spine and 5 

 rays. The dorsals are close together ; the pectorals are in a groove. 

 The first dorsal is triangular ; the other fins are pointed ; the lobes 

 of the caudal are narrow and long, the fork being deep and broad. 

 The scales in the fore part of the body form a corslet, with three 

 prolongations. In colour this Tunny is dark blue on the back, grey 

 netted with darker grey along the sides, and white below ; the 

 pectorals are edged with white, In length it reaches 9 feet or more. 

 It is generally observed in shoals, but only a few stragglers have been 

 caught round the British Islands. 



The Long-finned Tunny has 14 spines in its first dorsal, 3 spines 

 and 12 rays in the second, with 7 or 8 finlets behind ; the anal has 

 3 spines and 12 rays, with 8 or 9 finlets behind it ; the caudal has 35 

 rays, the pectorals 37, the ventrals a spine and 5 rays. The pectorals 

 are in a groove, and are curved and pointed and a third as long as 

 the fish ; the ventrals are close together, with only one scale between 

 them. The colour is deep blue above and silvery below, with narrow 

 stripes occasionally present. The few British examples have been 

 between 2 and 3 feet in length. This Tunny ranges from the Bay of 

 Biscay to the Cape of Good Hope, and migrates in shoals. 



