48. PERISTETHUS. 219 



inches, lines. 

 Greatest length of an anterior ventral plate. 1 3 



width of an anterior ventral plate. 8 



length of a posterior ventral plate. 9 



width of a posterior ventral plate . 8 



3. Peristethus laticeps. 



Schleff. Bydr. tot de dierk. v. 1852, p. 4-3, cum tab. 

 D. 24. A. 17. 



The length of the prseorbital processes is one-third of the distance 

 of theii- extremities from the anterior margin of the orbit. Three 

 small spines on the upper surface of the snout. The ridge of the 

 angle of the praeoperculum terminates in a spine of moderate length. 

 TJnifonn red. (Schleg.) 



Amboyna. 



4. Peristethus orientale. 



Temm. ^ Schleff. Faun. Japan. Pom. p. 37. pi. 14. f. 5, 6, & pi. 14. A. 

 f. 1, 2, and Bydr. tot de dierk. v. 1852, p. 44 ; Kaup, Proc. Zool. Soc. 

 1859, p. 105. pi. 8. f. 2. 



D. 28. A. 20. 



Prseorbital processes divergent, elongate, their length being one- 

 half of the distance between their extremity and the anterior margin 

 of the orbit. Ko spines on the upper surface of the snout. Each of 

 the bony plates between the ventral fins is three times as long as 

 broad. The ridge of the angle of the prasoperculum terminates in a 

 strong spine. A single dorsal fin. 



Japanese Sea. 



5. Peristethus moluccense. 



Valent. iii. p. 363. f. 55 ; Renard, ii. 14. 67. 



Peristedion moluccense, Bleek. Natuurk. Tydschr. Nederl. Ind. i. p. 24, 



and Act. Sue. 

 Peristethus gigas, Kaup, I. c. p. 106. 



D-7|i^. 



A. 16. L. lat. 26. 



Prseorbital processes rather elongate, their length being one-third 

 of the distance between their extremity and the anterior margin of 

 the orbit. Three small spines on the upper surface of the snout. 

 Each of the bony plates between the ventral fins is nearly as broad 

 as long. The ridge of the angle of the praeoperculum terminates in 

 a strong spine. 



Molucca Sea. 



o. Fine specimen. Amboyna. , 



6. Peristethus rieffeli. 



Peristethus rieffeli, Kaup, I. c. p. 106. pi. 8. f, 3. 

 D. 6 I 19. A. 17. L. lat. 32. 

 The length of the pi-aeorbital processes is 2j in the distance- of 



