32 



Distance from extremity of snout to dor- 

 sal fin 13 mm. 



Distance from extremity of snout to vent 16 „ 



Length of head 4 „ 



Distance from extremity of snout to eye's 



anterior margin 1,5 ,, 



Eye's diameter 0>- 5 » 



i 

 21. L. crenatus n. sp. 



PI. in. f. 4 and 5. 



The body is compressed, rather short and high; 

 its greatest height, contained about ten times in its 

 length is situated behind the middle; from this point 

 the height decreases by degrees, quite considerably 

 towards the head, but scarcely at all towards the tail. 

 The upper profile of the body is almost straight, the 

 lower one on the contrary is pretty considerably con- 

 vex; both profiles are slightly wavy or crenulate. 



The head is very small; its length goes into the 

 body's greatest height about two and a third times. 

 Its upper profile is in the form of a regular arch. 

 The snout is obtuse. -From the snout-extremity .' to 

 the anterior margin of the eye there is a distance not 

 quite equal to the double of the eye's diameter. The 

 eye has a circular contour ; its upper margin does not 

 reach up to the head's upper profile. The posterior 

 nostril is nearly circular and placed directly in front 

 of the eye's anterior margin; the anterior nostril 

 is shaped like a tube, very short in length. The in- 

 terspace of the nostrils is about as great as the di- 

 stance between the anterior nostril and the snout- 



