532 



DEEP-SEA FISHES ,0F THE ATLANTIC BASIN. 



II. 



THE INDIAN SPECIES OF CCELORHYNCHUS AND MACRURUS. 



1. Key to the Indian Species of the Subgenus Cieloritynchus. 



' 1. Scales of the body with not more than five spiny 

 ridges; six rows of scales between the alter 

 limit of the first dorsal tin and the lateral line; 



body with numerous cross-bands Macrurus 



(Ccelorhynchus) quadricristatus. 



Scales of the body with usually eight spiuy ridges ; 



lour rows of scales between the after limit of 



the first dorsal fin and the lateral line; color 



uniform dark stone-gray Macrurus 



(Ccelorhynchus) flabellispinis. 



Scales of the body with parallel spiny ridges, the spinature of the middle one of which is by far the 

 strongest; pyloric caeca twelve in number/ 3. Macrurus ( ( icelorhynchus) parallel™, Gtnr. 



2. Key to the Indian Species of the Subgenus Macrorus. 



Scales of the body with distinctly radiating spiny 

 ridges, all of which are uniform in size and spina- 

 ture ; pyloric csBca about forty in number. 



S i x branchiostegals 

 [seven to nine rays 

 in the ventral fiu]. 



Second spine of the first 

 dorsal fin remarkably 

 prolonged, more than , 

 twice the length of the 

 head; eight rays in the 

 ventral fin. 



Scales small, with five or six well-spaced parallel 



rows of spinelets.il/acj-MrH8 {Macrurus) hiphotcs. 



. Scales large, with about seventeen oblique 



crowded rows of spinelets Macrurus 



(Macrurus) macrolophus. 



No greatly prolonged 

 spine in the dorsal fin; 

 seven to nine rays in 

 the ventral fiu. 



Scales with rows of 

 spinelets all of which 

 are of uniform small 



size; greatest height 

 of the body much 

 exceeding that of the 

 tail. 



II. Seven branchioste- 

 gals [eight to twelve 

 rays in the ventral 

 fin]. 



1. Usually eight rays in the 



ventral fin ; scales with 

 spinelets which may be ' 

 in rows or not, but are 

 never densely packed. 



Seven rays in the ven- 

 tral fin; snout blunt, 

 not longer thau the 



eye Macrurus 



( Macrurus) Hextii. 

 Eight rays in the ven- 

 tral fin; snout sharp, 

 longer than the eye. 

 Macrurus (Macrurus) 

 Wood-Masoni. 

 Scales with rows of spinelets of which those in 

 the middle row are conspicuously larger than 

 the others; body not abruptly delimited from 

 the tail; nine rays in the ventral fin.. Macrurus 

 (Macrurus) Hoskynii. 

 Mouth very large; snout remarkably shallow; 

 barbel considerably longer than the eye; spine- 

 lets of the scales without any arrangement; a 

 patch of enlarged cycloid scales behind the first 

 dorsal fin ; cheeks, opercles, and belly burnished 



silver; ventrals eight-rayed Macrurus 



(Macrurus) Petersoni. 



Mouth very small ; snout deep; barbel not half 



as long as the eye; spinelets of the scales 



arranged in definite rows; opercles and belly 



black ; ventrals eight-raj ed Macrurus 



( .tin* runts ) Investigatoris. 



2. Ten rays in the ventral fiu; scales with densely packed spinelets which show 



no arrangement in rows; snout quite peculiar in being vertically truncated 



with an abruptly prominent median tubercle, its length without the tubercle 



being not much' more than half that of the eye Macrurus 



( Macrurus) brerirostris. 

 I a. Head large, its length 

 about one-tilth of the 

 total; gill-openings 

 extremely wide, the 

 membranes being 

 united only quite in 

 front; ventrals 

 (eleven or) twelve 



rayed Macrurus 



(Macrurus) polylepis. 

 Head singularly 

 small, its length 

 about one-eighth the 

 total; gill-openings 

 of the usual width, 

 the membranes being 

 broadly united; ven- 

 trals with twelve 



rays Mai rurus 



i Macrurus) pumiliceps. 

 Body of the usual tapering form ; spinelets of the 

 scales in densely crowded rows, fifteen in num- 

 ber, besides short rows in between; ventrals 



(eleven or) twelve rayed Macrurus 



(Macrurus) semiyuhicuiiciattis. 



Usually twelve rays in 

 the ventral tin ; scales 

 with rows of spinelets 

 which may be either 

 close-set or open. 



Tail lash-like and fili- 

 form : spinelets of the 

 scales in definite' 

 short rows, eight or 

 nine in number. 



