FI.ATFISHKS (HF.TEROSOMATA) 



.'. Nonf of the rays of dorsal iirolonged. 



a. Head 33 to 4 in length ; maxillary 2J to j|. lower jaw r ;] to 2 in 



head ......... 4. Intiriia. 



b. Head 3^ to 3? in length ; maxillary .' ^ to 2 J, lower jaw about 



1 3 in head ....... 5. niairosloma. 



H normal 1J3-106, anal 74-82 ; eye 2 ji to 4 in head ; anterior rays of dorsal 

 more or less prolonged. 

 I Depth 2 J to 2| in length : eyes (in adults) separated by a bony ridge 



6. impcrialts. 

 2. Depth 2j to 2S in length ; eyes (in adults) separated by a narrow 



concave space . . . . . . .' . y. capensis. 



Dorsal I lo-i 16 (i iS). anal 86-94 ■ depth j to 3 J in length ; eye about 3 in 

 head .......... S riteppelhi- 



Indo-Pacific Species. 

 .\nterior teeth of upper jaw scarcely enlarged ; teeth of lower jaw small, 

 rather close-set, similar to those of upper jaw ; eyes separated by a bony 

 ridge. 



A. Anterior rays of dorsal greatly prolonged in the male, a little longer than 



those which follow in the female ; eye 3 to 3J in head . o. tapemosoma. 



B. Anterior rays of dorsal not or a little prolonged. 



1. Eye 3j to 5 in head ; depth ij to 2S, head 4 to 4J in length. 



a. Eye 45 to 5 in head ; depth i; to 2^ in length ; dorsal and anal 



rays not scaled ........ 10. fisoni. 



h. E)ye 3^ to 4! in head ; depth 2 J to 25 in length ; dorsal and anal 

 rays scaled. 

 .1. Dorsal 80-84, anal 61-64 ■ . • • ■ .11 aspilos. 



fi. Dorsal 93-103, anal 70-82. 



* Depth 2 J to 25 in length ; dorsal 93-98, anal 70-74 . 12. tenuis. 

 ** Depth 2^ to 2I in length ; dorsal 94-103, anal 76-82 . 13. tvatlei. 



2. Eye about 3 in head ; depth 3 or nearly 3, head 3I to 35 in length 



14. eloiigaliis. 

 Anterior teeth of upper jaw larger than those at sides ; teeth of lower jaw 



stronger and more wide-set than lateral teeth of upper jaw. 

 A. Eyes separated by a bony ridge or very narrow space ; gill-rakers pointed, 

 longer than broad. 

 I. Less than 100 scales in lateral line ; width of curve of lateral line i.l 

 to 2^ in head ; upper profile of head moderately conve.x aliove and 

 behind eyes. 

 «. Dorsal 90-106, anal 72-84 



n. Maxillary to below anterior p.irt or middle of eye, 2^ to 3 in 

 head. 



* 63 to 75 scales in lateral line, 



t Scales feebly ctenoid on ocular side, 68 to 75 in lateral line ; 



maxillary to below anterior part of eye, 2j to 3 in head. 



J Depth 25 to 2|, head 3I to 3I in length ; eye 3I to 4J in 



head ; dorsal 103-106, anal 81-S4 . . 15. polyspiliis. 



+ + Depth 2 J to 2i, head 4 to 4^ in length ; eye 4 to 5 in head ; 



dorsal 90-97, anal 72-75 . . . 16. mitclleyi. 



ft Scales cycloid on ocular side, 113 to 04 in lateral line ; 

 maxillary to below middle of eye, a little more than 

 twice in head . . . . . . 17. japoniciis. 



** 87 to 92 scales in lateral line ; scales cycloid on ocular side ; 



dorsal 98-c)9, anal 77-78 .... 18. bassensis. 



li. Maxillary to below posterior \ of eye, about twice 111 head . 



70 scales in lateral line ..... I'j dalgleishi. 



