MARINE SILVER HATCHETFISHES — SCHULTZ 607 



N., long. 70°39' W., to lat. 39°48' N., long. 70°28' W., 2 specimens, 

 13.5 to 18 mm. BOC 3768 (nolo type of Argyropelecus micracanthus 

 Parr) . 



Distinctive characters: Lower preopercular spine directed 

 straight downward and curved a little outward; upper preopercular 

 spine short, pointing outward, its tip not extending past rear margin 

 of bony edge of preoperclc; a single postabdominal spine directed 

 downward and curved a little forward; space between anal group and 

 subcaudal group of photophorcs about equal to width of last two anal 

 photophores; supra-abdominal, preanal, and anal photophores not in 

 a straight line; caudal peduncle crossed with a white or pale bar be- 

 tween anal and subcaudal groups of photophorcs. 



Description: Counts made are given in table 1, p. 591, and table 2, 

 p. 592; measurements made are given in table 3, p. 593. This deep 

 bodied species, when it reaches a standard length of over 35 mm., de- 

 velops spines along the ventral edge of the caudal peduncle, around the 

 anus, and the ventral bony edge of the abdominal ridge becomes ser- 

 rated; also three flat bonylike spines develop between the two parts 

 of the anal fin; the space between anal and subcaudal groups of photo- 

 phores is much greater in small specimens than in the adults. 



Color: The color pattern is shown in figure 8, p. 625. 



Range: This species occurs in the Atlantic Ocean and at Lord 

 Howe Island in the Pacific Ocean to a depth of at least 550 fathoms 

 and perhaps over 1,000 fathoms (Parr 1937). 



Remarks: H. aculeatus may be confused with II. amabilis when 

 the posterior abdominal spine of aculeatus is damaged and only the 

 anterior one remains. 



Argyropelccus aculeatus Cuvier and Valenciennes 



Figure 9 



An/yropelecus aculeatus Cuvier and Valenciennes, Histoire naturelle des poissons, 

 vol. 22, p. 408, 1849 (type locality, off the Azores). — Gunther, Catalog of the 

 fishes in the British Museum, vol. 5, p. 386, 1864 (Azores). — Sauvage, 

 Histoire physique naturelle et politique de Madagascar, 1887-91, Paris, vol. 

 16 (Poissons), p. 483, pi. 48, fig. 5, 1875 (Reunion Island) — Goodc and Bean, 

 Oceanic ichthyology . . ., U.S. Nat. Mus. Spec. Bull. No. 2., p. 127, 1895 

 (mid-Atlantic).— Collett, Forh. Vid. Selsk. Christiania 1903, No. 9, p. 108, 

 L903 (off Norwegian coast); Zool. Anz., vol. 28, No. 21-22, p. 726, 1905 (on 

 Collett, 1897). — Brauer, W'issonschaftliche Ergebnisse der Deutschen Tiefsee- 

 Expedition auf dem Dempfer Valdivia, 1898-1899 . . ., vol. 15, pt. 1, p. 110, 

 fig. 47, L906 (Atlantic an 1 In diarj Oceans). — Murray and Hjort. The depths of 

 the ocean . . ., p. 642, 1912 (Atlantic). — Hoek, Conseil Perm. Intern. Expl. Mer. 

 Pub. Circonst., No. 12, p. 53, 1914 (North Sea). — Jespersen, Report on the 

 Danish oceanographical expeditions to the Mediterranean, 1908-1910, vol. 2, 

 No. 3, pt. 2A, p. 27, 1915 (Atlantic). — Norman, Discovery reports, vol. 2, p. 

 303, fig. 11, 1930 (South Atlantic, surface to 1,000 meters).— Borodin, Bull. 



