26 



EINAR LEA. 



[REP. OF THE "MICHAEL SARS" NORTH 



The lower contour of the lower jaw is curved and 

 does not form an angle. Its point lies a little behind the 

 point of the snout. 



The alimentary canal is quite thick, but otherwise 

 normal in appearance. 



The pectoral fin is totally absent, not even the 

 slightest trace being found. The caudal fin has 4 rays, 



Fig. 21. Head of L. euryurus, station 34. ls /i. 



H! and H 2 having each two rays. Rays as well as inter- 

 spinous elements have developed in the hindmost portions 

 of the embryonic vertical fins, close to the caudal fin. 

 The rays nearest to the tail fin are most highly developed, 

 and number 8 in the dorsal fin and 4 in the anal fin. 

 The only pigment seen consists of a row of very 

 small oval dots along the outer margin of the embryonic 

 vertical fins. 



Fig. 22. Head of L. euryurus, station 45. 15 /i. 



The second specimen was taken at Stat. 45 in 1000 

 metres, and differs slightly from the first specimen, but 

 they agree in all essential characters. 



The eye is slightly smaller than in the first specimen, 

 and the head differs slightly in shape (compare fig. 21 

 with fig. 22). 



This specimen is 55 mm in length, with a maximum 

 height of 7 mm. It has 59 preanal and 58 postanal, 

 117 in all. 



The anus lies almost midway between the point of 

 the snout and the. tip of the tail, but a little nearer the 

 head than the tail. The head (shown in fig. 22) has a 

 bend in the upper contour. The snout is short and pointed, 

 measuring 1-1 mm from the point to the anterior margin 

 of the eye, which has a diameter of 0-4 mm, and is placed 

 unusually far down in the head. The position of the 

 nostrils, both of which are pores, is shown in fig 22. As 

 for teeth, it has first quite a long "fronf'-tooth in each 

 half of the upper jaw then a "corner"-tooth (broken off), 

 and finally 8 quite strong conical teeth, which decrease 

 in size backwards. In the lower jaw it has a long curved 

 tooth at the front, and behind it 8 conical teeth. The 

 lower jaw is not quite so fleshy as in the other specimen. 

 The gill-opening is a narrow slit placed laterally. 



Pectoral fin absent. In the posterior portions of the 

 vertical fins may be seen the first feeble traces of inter- 

 spinous elements, and possibly also one or two rays. The 

 caudal fin too, is feebly developed, but the 4 rays may 

 easily be seen: two on Hi and two on H2. 



As for pigment it has only a series of small dots 

 along the outer margin of the embryonic anal fin. 



14. Leptocepha/us similis n. sp. 



Two individuals of this species were caught at Stat. 

 64, no. 1 at 100 metres, and no. 2 at 1000 metres. This 

 species greatly resembles L. euryurus and doubtless the 

 parent-forms are closely related. 



No. 1, represented in fig. 6, pi. IV, is 34 mm long, 

 attaining its greatest height 5 mm on the tail portion. 

 The anus lies nearly midway between the point of the 

 snout and the tip of the tail, 17-5 mm from the point of 



Fig. 23. Head of L. similis, station 64, 



the snout. There are 54 preanal and 56 postanal segments, 

 110 in all. The tail is quite rounded. 



The head, shown in fig 23, is short in proportion to 

 height, its length being 2-4 mm, greatest height, 1-9 mm. 

 The distance from the point of the snout to the anterior 

 margin of the eye is 0-8 mm. The eye is placed near 

 the mouth, the brain extending over it. The nostrils are 



