OPISTHOGXATHrS. 69 



One specimen of the hexophthalma form is a male, two appear to have been sterile ; 

 and one of the polyophthahna form was probably a female. 

 Zanzibar. Red Sea. Indian Ocean. Louisiade archipelago. 



230. Percis xanthozona. Plate YHI. fig. 3. [447.] 

 Percis xanthozona, Bleek. Verhand. Bat. Genootsch. 1849, vol. xxii. p. 59; Giinth. Fish. ii. p. 240. 



D. 5 | 21. A. j^jg. L. lat. 63-65. L. transv. 6/18. 



The two middle dorsal spines are the longest, the second not being very much longer 

 than the first. The height of the body is contained seven times and two-thirds, and 

 the length of the head thrice and three-fourths in the total length. The interorbital 

 space is very narrow, the bony bridge between the eyes being about one-third of their 

 horizontal diameter. The ventrals do not quite, the pectorals do reach to the vent. 

 The praeoperculum is entire, the caudal convex. 



The general colour of the upper portion of the body is light greyish olive, the lower 

 part is white, these two colours being separated by a light lateral band. The upper 

 lip has three dark-brown spots on each side ; the upper surface of the head and body 

 is marked with numerous brown dots, arranged in about eight broad but indistinct 

 cross bands. Along the lower side of the body is a series of about ten large dark- 

 brown spots, connected together at the upper surface by a narrower and lighter band ; 

 there is a single small spot in each interspace between the larger ones. The dorsal is 

 very faint yellow, with three longitudinal series of black dots ; the anal is white, with a 

 single series, and a black and white margin. The caudal has a large milk-white patch 

 and irregular black spots and markings. — Length 6 inches. 



Zanzibar. Sea of Batavia. 



231. Percis pulchella. [242.] 

 Percis pulchella, Schleg. Faun. Japon. Poiss. p. 24, pi. 10. f. 2; Giinth. Fish. ii. p. 240. 



Zanzibar. Japan. 



SILLAGO, Cuv. 



232. Sillago sihama. t 180 -] 

 Atherina sihama, Forsk. p. 70. 



Russell, t. 113. 



Sillago sihama, Riipp. Atlas, Fische, p. 9, t. 3. f. 1; Giinth. Fish. ii. p. 243. 



Aden. Zanzibar. Seychelles. All Indian seas. 



OPLSTHOGNATHUS, Cuv. 



233. Opisthognathus mgromarginatus. [33&] 

 Opisthognathus nigromarginatus, Riipp. Atlas, Fische, t. 28. f. 4; Giinth. Fish. ii. p. 254. 



Zanzibar. .Mozambique. Red Sea. India. 



