220 EXPEDITION OF THE " ALHATUOSS," 1899-1900. 



\j Dasyscopelus spinosus (Steindachner). 



Scopelus spinosua Steindacumer, Sitz. ukad. wiss. Wien, 1867, 55, p. 711, pi. .3, fig. 4. 



Twenty specimens of this species were obtained at the following localities: 



Lat. N. 13= 32' Long. W. 135° 40' 



Lat. N. 3° 28' Long. W. 130" 54' 



Lat. S. 15" 24' 30" Long. W. 147° 59' 40" 



Lat. S. 16° 39' Long. W. 149 11' 



The number of individuals is too limited lor satisfactory compari.son with 

 Hawaiian material. The photophores of the anal series are present in 

 numbers as follows: 7 + 5 in 4 cases, 7+6 in 20, 7 + 7 in 9, 6 + 6 in 3, 



6 + 7 in 3. G + 8 in 1. Thus in the anterior group, 7 occurs in 33 cases, G in 



7 cases ; in the posterior group 8 occurs in 1 case, 7 in 12 cases, 6 in 23 

 cases, and 5 in 4 cases. Comparing these with data given for Hawaiian 

 material (Bull. U. S. Fish Com., 1905, 23, p. 599), it appears that the nu)re 

 southerly specimens average one less photophore in the anal series. The 

 total number varies from 12 to 14, 13 prevailing, while in Hawaiian material 

 the range was from 13 to 15 with 14 prevailing. In the southern material, 

 the number 8 is absent from the anterior group, and 6 occurs not infre- 

 quently, while in Hawaiian species, 8 is common and 6 very rare. A 

 similar difference is found in the posterior group. 



The serrations on the scales are very evident in specimens 30 nun. long, 

 but are not apparent in those 20 ram. long. The serrations develop first on 

 the scales along the dorsal profile behind the dorsal fin. 



Dasyscopelus pristilepis Gilhekt & Ckamek. 



Gilbert & Cramer, Troc. U. S. Nat. Mus., 1897, 19, p. 412, pi. 39, fig. 1 ; Gilbert, Bull. U. S. 

 Fish Com., 1005, 23, p. GOO. 



Tlu'ee young .specimens from the following stations: 



Lat. N. 1' 45' Long. U'. 137 :!6' 



Lat. S. 10' 39' Long. W. 119 11' 



In the number of anal photophores 7 + 4 occurs bilaterally in one 

 specimen, 7 + 5 bilaterally in another, 7 + 4 and 7 + 5 in the third. 



