7. ObTUAClON. 263 



lines radiate. Interorbital space concave. Sides and back punc- 

 tulutcd with white, abdomen with brown. Two lij^ht brown- 

 edged bands on the side : one, which is the broader and more con- 

 stant, proceeds from the lower part of the gill-oponing ; the other 

 is close to the dorsal ridge. Sometimes the lower band advances on 

 the cheek, where it is bifurcate, one part crossing the forehead. 

 Sometimes all the dots are brown. (Bollard.) 

 Marquesas Islands. 



13. Ostracion nasus. 



Ostracion nasu.s Bl. Aitsl. FUrh. i. p. 118, taf. 1-38; lil. Schn. p. 500; 



Lact'p. i. p. 4o8; Jilcck. Verh. But. Gen. xxiv. BalUt. p. .3.3, tab. 7. 



fig. \~>, and All. Ichth. Ostrac. p. .30, pi. 4. fig. 2, and pi. 2. tig. .5; 



Hollard, Ann. Sc. Xat. 18.j7, vii. p. 101 ; ? Day, Fuih. Maluh. p. 2.53. 

 tesserida. Cant. Mul. FUh. p. ;j07, pi. 8. figs. 2 & 3. 



Carapace five-ridged, without spines, forming a broad continuous 

 bridge across the back of the tail. A very distinct ridge runs along 

 the median line of the back. All the ridges rather sharp. Inter- 

 orbital space deeply concave, the superciliary edge being granulated 

 and passing into the lateral dorsal ridge. Snout with the anterior 

 "profile concave, and with a more or less developed hump immediately 

 above the mouth. Body and tail with irregularly scattered round 

 black spots, each of the size of the pupil of the eye. Abdomen 

 white. 



East-Indian archipelago ; Pacific. 



a,h-c. Young. Pinang. From Dr. Cantor's Collection. — Types of 



0. tesserida. 

 d-e. Adult (8| inches) and half-grown : skins. Pacific. Voyage 



of H.M.S. ' Herald.' 

 f-h. Half-grown : skins. 



14. Ostracion rhinorhynchus. 



Wilhdjhhy, Append, p. 20, tab. J. 11 ; Scba, iii. tab. 24. fig. 4. 

 Ostracion, sp., Artedi, Sijnon. p. 84. no. 7 ; Genera, p. 50. no. 3; 



Gronov. Mus. i. p. 54. no. 120, and Zf)ophyl. p. 24. no. 174. 

 Ostracium nasus. Cant. Mai. Fwh. p. 369 (not BL). 

 Ostracion rhinorhvnchus, Bleik. Verh. Bat. Gen. xxiv. Balist. p. 34, 

 pi. 0. fig. 12 ; All. Ichth. Ostrac. p. 37, pi. 1. fig. 1, and pi. .3. fig. 1. 



Carapace four-ridged, without spines, forming a continuous bridge 

 across the back of the tail. The median line of the back is distinctly 

 raised. Interorbital space very slightly concave. Snout with a 

 hump which, in adult examples, is but little below the level of the 

 forehead. Back and tail, and sometimes the sides, with numerous 

 small brown dots (2-10 on one scute). Abdomen immaculate. 



East-Indian archipelago ; Australia. 



n-b. Half-grown : skins. Pinang. From Dr. Cantor's Collection, 

 c. Adult (11 inches). East-Indian archipelago. From Dr. BItiker's 

 Collection. — Type of the species. 



