138 GENERA AND SPECIES. 



There is a ridge along the top of the snout which is joined by another 

 over the eye. The osseous plates number 19 or 20 to the vent, and 

 from 44 to 46 beyond. In the males the dorsal is higher and the 

 abdomen broader than in the females. There are lines of spots on 

 the dorsal, and a black spot at the base of the first ray. The colour 

 is brownish, with dark broad bands ; the length reaches 16 inches. 

 This pipe-fish is generally found in deep water, but has been taken 

 in shallows among rocks and weeds. It can swim in almost any 

 position, and occasionally skims over the water in duck-and-drake 

 fashion. 



Tetrodon. Plate xv. DIODONTID&. 



122. lagocephalus, GLOBE FISH. Gullet dilatable into a spherical 

 shape. 



The Globe Fish has from 12 to 14 rays in its dorsal, 12 to 14 in its 

 anal, 12 in its caudal, 14 or 15 in its pectorals, and it has no ventrals. 

 The dorsal and anal are placed more than halfway towards the tail. 

 The eyes are well back, the nostrils distinct, the beak divided by a 

 suture. In colour it is blue above, the underparts being silvery and 

 armed with fixed spines, each having four roots. It reaches about 

 22 inches in length. 



Thymallus. Plate xxvii. SALMONIDSE 



218. vulgaris, GRAYLING. Scales in regular rows; dorsal long and 

 high. 



The Grayling has from 20 to 24 rays in the first dorsal, the second 

 dorsal is adipose, there are from n to 14 rays in the anal, 21 in the 

 caudal, 15 or 16 in the pectorals, and 10 or n in the ventrals. The 

 ventrals are under the middle of the dorsal, and small, the anal is 

 under the adipose dorsal. The scales in the lateral line number 

 from 75 to 85. The back is more curved than the abdomen ; the 

 shape is slender and graceful; the upper jaw is the longer. The 

 head is bluish, the back golden, with parallel grey lines along the 

 side ; the fins are banded and spotted with purple. In length the 

 Grayling reaches about 16 inches. It is generally gregarious and 

 local in occurrence, confined to clear streams running over sand and 

 gravel, with many pools and shallows. It swims deeper than the 

 Trout, and feeds mainly on molluscs and crustaceans. 



Thynnus. Plate vi. SCOMBRIDJS. 



41. pelamys, BONITO. Parallel stripes along the sides following the 

 curve of the abdomen. 



The first dorsal has from 13 to 15 spines, the second a spine and 

 12 or 13 rays, behind it are 8 finlets ; the anal has 2 spines and 12 

 rays, behind it are 7 finlets; the caudal has 35 rays, the pec- 

 torals have 27 rays, the ventrals a spine and 5 rays. Both dorsals 

 are high, and pointed in front, the first spine of the first dorsal being 

 twice the length of the highest ray of the second dorsal ; the pectoral 

 is in a groove. The lateral line is curved throughout ; there is a 



