20 



15. L. immaculatus n. sp. 



PI. I. f. 4 and 5. 



The body is very strongly compressed, rather 

 elongated and low; its greatest height, contained a 

 little more than nine times in its length, is situate 

 in the middle, whence the height diminishes about 

 evenly towards head and tail.' 



The head is small; its length is contained about 

 two and one third times in the greatest height of 

 the body-. Its upper profile is slightly convex and 

 descends rapidly. The snout is pointed. The distance 

 from the extremity of the snout to the anterior mar- 

 gin of the eye is about one and a half times greater 

 than the diameter of the latter. The eye has a cir- 

 cular contour; its upper margin does not reach to 

 the upper profile of the head. The posterior nostril 

 is situated immediately in front of the eye's anterior 

 margin; the anterior nostril is a short distance from 

 the posterior — the distance being about one third of 

 that between ' the anterior nostril and the extremity of 

 the snout. The cleft of the mouth is almost horizon- 

 tal, reaching back to the middle of the lower margin 

 of the eye. The mandible 1 has the same length as 

 the upper jaw, its under profile is straight, retreating 

 with 1 a very prominent , angle. Both jaws are toothed. 



The pectoral fins are not much developed. The 

 vertical fins are rudimentary; the dorsal fin has its 

 commencement immediately in front of the vent. The 

 caudal fin is short and rounded. 



The vent is situated near the ' hinder end of the 

 body.;. _the distance between it and the end of the 



