68 



One specimen, nearly four inches long, from the Gulf of Martaban 67 

 fathoms. 



Regd. No. -j-. 



This species was taken by the Challenger in the seas of the Bast Indian 

 Archipelago at 140 fathoms. 



48. Lepidotrigla spiloptera var. longipinnis, Alcock 



Lepidotrigla spiloptera, var. longipinnis, Alcock, Ann. Mag. Nat. Hist., Dec. 1890, p. 429. 



Only differs from the type in the great length of the pectoral fins, which 

 reach to, or beyond, the 9th anal ray. 



Largest specimen five inches long. 



Off Ganjain coast 18 fathoms, Gulf of Martaban 67 fathoms, Andaman Sea 

 55 fathoms, off Malabar coast 68 to 148 fathoms and 100 fathoms. 



-r. i tvt innntr 295 416-417 499-527 680-688 



Regd. Nos. 12925, -p, — j — , — j — , — — . 



Family Cfltaphracti. 



Peristethium, Lacepede. 



Diagnosis, etc., recorded in the Fauna of British India, Fishes, II. p. 241. 



Key to the Indian species of the genus Peristethium. 



I. Pre-opercubx ridge not prolonged to form a spine ... ... P. Rivers- Andersnni. 



II. Pre-opercular ridge prolonged to form a spine : — 



1. Preorbital processes long, narrow, spatliulate ... P. serridatnm. 



2. Preorbital processes short, broad, triangular : — 



i. Twenty rays in the soft dorsal ... ... P. investigatoris. 



ii. Fifteen rays in. the soft dorsal ... ... P. Halyi. 



49. Peristethium Rivers- Ander so ni, Alcock. 



Peristethus Rivers- Andersoni, Alcock, Journ. As. Soc. Bengal, Vol. LXIII. pt. 2, 18SN, p. 121, pi. vi. figs. 2, 

 2a, 26. 



B. 7. D. VI. 22. A. 21. L. lat. 32. 



The length of the narrow sub-spathulate pre-orbital processes is nearly 

 equal to the distance between their base and the anterior border of the orbit : 

 each has, on the upper surface near its base, a recurved upstanding spine. 



The pre-opercular ridge is remarkably salient but is sharply truncated, not 

 forming a spine. The opercular ridge forms a short blunt spine. 



The lower jaw is thickly fringed with small tentacles. The long labial 

 tentacles when laid back hardly surpass the angle of the mouth. 



