Vol. VI, No. 9.] Triacanthus weberi, sp. nov. 

 [N.S.] 



Height of body in the total 



499 



length excluding caudal 



In Tr. biaculeatus, 2+ times. 



In Tr. oxyeephalus, 2 .', — 2 J 

 times. 



In Tr. brevirostris, 2£— 2 

 times. 



In Tr. indicus, 2 \ — 2 jf times. 

 In Tr. nieuhofi, 2i tin 



1 



y 



j 



Length of caudal peduncle hO 



the total length 



In Tr. blochi, 41 



5 times. 



In Tr. strigilifer, 4£ 



_ —51 times. 



In Tr. biaculeatus, 4 

 In 



y 



\ 



2 



5 times. 



Tr. oxyeephalus, 6| — 7 



times. 



j 



Length of eye in length of ^ 



head 



iphalus 



31-41 



4 times. \ 



5 times, 

 mes. J 



r- 



Intra-orbital space — ") 



In Tr. strigilifer, concave with- 

 out distinct median ridge. 

 InTr. biaculeatus, concave with 

 median ridge scarcely dis- 

 tinct. 



In Tr. oxyeephalus, flat. 



In Tr. brevirostris, with dis- 

 tinct ridge with a groove on 

 each side. 



In 



the 



-height 



new species 



of body in 

 total length excluding 

 caudal is throe times. 



In the new species 

 length of caudal pedun- 

 cle in the total length 

 is four times. 



In Tr. biaculeatus, 3±— 4 times. { In the 





length 



length 

 times. 



new 

 of eye 

 of head, 3 



species — 

 in the 



In the new 



th 



species- 

 intra orbital space con- 

 sists of two lateral 

 convexities with a shal- 

 low fossa or depression 

 in the middle of the 

 spa< . 



The occipital crest — 



In Tr. blochi — upper edge of 



occipital crest forms an angle 



of about 160 with that of 

 snout. 



In Tr. biaculeatus — upper mar- 

 gin of occipital crest forms 

 an angle of 170 with that of 

 the snout. 



In Tr. oxycephalic — upper 

 edge of occipital crest is »n- 

 vex. 



1 



i 



> 



In the new sp< ies th 

 upper edge of the 



pital en t is aim t in 

 the same traight line 

 as that of the snout. 



