48. PERISTETHUS. 219 



inches, lines. 

 Greatest length of an anterior ventral plate. 1 3 



Mddth of an anterior ventral plate. 8 



length of a posterior ventral plate. 9 



width of a posterior ventral plate ,08 



3, Peristetlms laticeps. 



Schleff. Byclr, tot de dierk. v. 1852, p. 43, cum tab. 

 D. 24. A. 17. 



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

 of their extremities from the anterior margin of the orbit. Tlu'ce 

 smaU sjjines on the upper surface of the snout. The ridge of the 

 angle of the pra^operculum terminates in a spine of moderate length. 

 Uniform red. (ScJdeg.) 



Amboyna. 



4. Peristethus orientale. 



Temm. %■ Schleg. Faun. Japon. Poiss. p. 37. pi. 14. f. 5, 6, & pi. 14. A. 

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

 1859, p. 105.'pl. 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. No 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 praeoperculum terminates in a 

 strong spine. A single dorsal fin. 



Japanese Sea. 



5. Peristethus moluccense. 



Valeiit iii. p. 363. f. 55 ; Rcnard, ii. 14. 67. 



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



and Act. Soc. 

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



D. 7 1 i. A. 16. L. lat. 26. 



Prseorbital processes rather elongate, theii- length being one-third 

 of the distance between their extremity and the anterior margin of 

 the orbit. Three small spines on the upper surftice 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. 



a. Fine specimen. Amboyna. 



6. Peristethus rieffeli. 



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

 D. 6 I 10. A. 17. L. lat. 32. 

 The length of the pi-sDorbital processes is 2^ in the distance of 



