STERNOPTYCHIIDAE 



30s 



observed that the body is deeper in A. olfersii and the angle of the body behind the ab- 

 dominal spines more marked. The lower praeopercular spine is more or less straight in 

 A. sladeni, the small upper spine being well developed and directed outwards and back- 

 wards; in A. olfersii the lower spine is always more or less curved, and the upper spine 

 is very small in young examples and minute or absent altogether in the adults. 

 Hab. North and South Atlantic; Antarctic; Indian Ocean. 



-rlAr 



Fig. 13. Argyropelecus sladeni . Young and adult examples, (x 2|.) 



Sternoptyx diaphana, Hermann, 1781. 



Brauer, 1906, ' Va/divia' Tiefsee-Fische, p. 115, figs. 56-63. 



? Sternoptyx obscura, Garman, 1899, Mem. Mus. Comp. Zool. xxiv, p. 232, pi. liii, fig. r^ 



The ' Discovery ' obtained 84 specimens of this species from the following stations in 

 the North and South Atlantic, at depths ranging from 0-2700 m., measuring from 6 to 

 60 mm. in length: St. 78, 81, 85, 86, 87, loi, 256, 269, 281, 285, 287, 288, 295. 



Hab. Atlantic; Indo-Pacific. 



Fig. 14. Polyipnus laternatus. (x i-|-.) 



Polyipnus laternatus, Garman. 



Garman, 1899, Mem. Mus. Comp. Zool. xs.iv, p. 238. 

 St. 276. 5. viii. 27. 5° 54' 00" S, 11° i9'oo"E. Young-fish trawl, 150 (-0) m. : 3 specimens, 12- 

 14 mm. 

 28. .X. 25. 13° 25' N, 18° 22' W. 4! rn. net, horizontal, 900 (-0) m. : 1 1 specimens, 18-34 ™n^- 



Hab. Atlantic; West Indies. 



Distinguished from P. spitiosus, Giinther, 1 887, by the form of the post-temporal spines, 

 the presence of palatine teeth, and the arrangement of the postabdominal photophores. 



