27 



Length of body 58 mm. 



GHreatest height of body 8 „ 



Distance from extremity of snout to dor- 

 sal fin .- . 26 ,, 



Distance from extremity of snout to vent 33 ,, 



Length of head 3,5 , 



Distance from extremity of snout to eye's 



anterior ' margin . . 1,5 ,. 



Eye's diameter 1 ,. 



18. L. undulatus n. sp. 



PI. II. f. 4—6. 



The body is compressed, elongate, low, of almost 

 even height, a trifle higher nevertheless behind than 

 in front; its greatest height is contained about fifteen 

 times in its length. 



The head is very small; its length is contained 

 about one and a half times in the greatest height of 

 the body. Its upper profile is in the form of a reg- 

 ular arch. The snout is pointed. The interspace 

 between the snout- extremity and the front margin of 

 the eye is equal to one and a half times the latter's 

 diameter. The eye has a circular contour; its upper 

 margin does not reach up to the upper profile of the 

 head. The posterior nostril lies immediately in front 

 of the eye; the anterior one is quite close to the 

 other. The cleft of the mouth is horizontal reaching 

 as far back as the eye's posterior margin. The lower 

 jaw is of the same length as the upper and has a 

 convex lower profile retreating with a slightly pro- 

 minent angle. There are teeth in both jaws. 



