AET. 10 NOTES ON MYCTOPHINE FISHES PARR 19 



Total length without caudal fin 97 mim.^^ Proportions in per cent 

 of the total length without caudal fin : Length of head 28. Diameter 

 of eye 6.6. Length of lower jaw 22. Greatest height 19. Distance 

 from snout to dorsal fin 46. Distance from snout to ventrals 40.5. 

 Distance from snout to anal fin 56. 



Origin of anal fin below the end of the anterior three-fifths of the 

 base of dorsal fin. The general appearance of the species will be 

 sufficiently evident from the accompanying diagram. 



PLO nearer to the lateral line than to the base of pectoral fin. 

 Upper PYO vertically above lower PVO. 5 PO, the fourth elevated 

 to approximately midway between the levels of the upper and the 

 lower PVO. The interspace between first and second PO enlarged. 

 VLO ^° approximately midway between the lateral line and the base 

 of ventral fin, or lower, only slightly in advance of the vertical from 



Figure 8. — Lampanyctus nannochir Gilbert 



the anterior VO. 4c VO with gradually decreasing intervals, the 

 first interval being the widest. 3 SAO in a very slightly curved, 

 nearly straight, series, with the lower organ well behind and only 

 slightly higher than the fourth VO. This lower jSAO probably 

 represents the fifth VO of earlier descriptions. Second /SAO only 

 slightly nearer to the lower than to the upper SAO. Upper SAO 

 about 3 of its own diameters below the lateral line canal. 7 + 7 AO 

 (determined by comparison, between the different specimens in the 

 type-sample). Pol posterior to the vertical from the last antero-anal 

 organ and about 3 of its own diameters below the lateral line canal. 

 The postero-anal series begins at a considerable distance (about equal 

 to two normal photophore-intervals or even more) behind the end of 

 the base of anal fin. 3 Pre, well separated from the postero-anal 

 organs and apparently arranged in a nearly straight or only very 



" The measured specimen, on which the following description and figure are mainly 

 based, carried the tin tags of the sample and probably represents the holotype of the 

 species. Only the numbers and accurate arrangement of the posterior ventral series 

 (AO and Pre) were determined by comparison with the other specimens. 



=" See footnote 18 on the preceding page. 



