110 
GrERRIDiE. 
black, the former with a pale blue exterior margin. Caudal blue black, each lobe with 
a narrow pale blue margin. 
Length 12^ inches. 
Zanzibar. 
Family GERRIDiE. 
GERRES, Cuv. 
371. Gerres acinaces. Hate XVI. fig. l. [46.] 
Gerres acinaces, Bleelc. Nat. Tydschr. Nederl. Ind. 1854, vi. p. 194; G'unth. Fish. iv. p. 262. 
D. -p). A. L. lat. 45. L. transv. 
The height of the body is contained twice and three-fourths in the total length 
(without caudal) ; the diameter of the eye is one-fourth of the length of the head, and 
less than the extent of the snout, which equals the width of the interorbital space. 
The groove for the process of the intermaxillary bones extends beyond the front margin 
of the eye, and is entirely naked. The spines of the fins are rather slender ; the second 
dorsal spine is longer than the third, its length being more than one-half of the height 
ot the body, and two-thirds of the length of the head ; the second of the anal fins is 
not so strong as the second of the dorsal, scarcely longer than the third of the anal, 
two-sevenths of the height of the body, and two-fifths of the length of the head. 
Caudal with scarcely any scales, very deeply forked, the length of its lobes being 
contained twice and two-thirds in the total. Colour silvery, with very indistinct 
longitudinal interrupted brown stripes on the sides. 
Aden. Zanzibar. East-Indian archipelago. 
Length 8 inches. 
372. Gerres lineolatus, sp. n. Plate XVI. fig. 2 . [383 a.] 
D. pp A. p. L. lat. 38. L. transv. pj. 
This species is very closely allied to G. acinaces. The height of the body is con- 
tained nearly twice and one-half in the total length (without caudal), the length of the 
head thrice and one-fourth. The diameter of the eye is contained thrice and a half in 
the length of the head, and is slightly less than the snout, which equals the width of 
the interorbital space. The snout is more obtuse and less spatulate than in G. acinaces , 
and the groove for the processes of the intermaxillary bones does not extend quite so 
far behind the front margin of the eye. 
The spines of the fins are rather slender ; the second of the dorsal is longer than 
the third, and more than half the height of the body, and five-eighths of the length of 
the head. The second of the anal is longer and stronger than the third, and somewhat 
stronger than the second, of the dorsal ; its length is one-third of the height of the 
