3H() STERNOPTYCHID.K. 



2. Argyropelecus olfersii. 



Stemoptyx olfersii, Cuv. Rlqyie Aiiim. 2nd edit. ii. p. 316. pi. 13. fig. 2 ; 



Ditien 8c Karen, in Vet. Acad. Handl. 1844, p. 80. tab. 3. fig. 6. 

 Arg-sTopelecus olfersii, Ouv. ^- Val. xxii. p. 408 ; Loice, Proc. Zool. Soc. 



1850, p. 247. 



B. 9. D. 9. A. 11. P. 10. V. 6. 



The height of the body is equal to, or rather less than, the distance 

 between the shoulder and the root of the caudal fin ; the tail at its 

 base, below the end of the dorsal fin, is as high as long. Mandible 

 with a short flat spine at its posterior corner ; angle of the praeoper- 

 culum with a spine directed downwards ; tail without spines. The 

 pectoral fin extends to the ventral. 



Atlantic ; coast of Norway. 



3. Argyropelecus durvillii. 



Cuv. S,- Val. xxii. p. 405. 



B. 9. D. 9. A. 10. P. 10. V. 6. 



The height of the body equals the distance between the gill-opening 

 and the root of the caudal : tail miich higher at its base than in A. 

 hemigymnus ; mandible without prominent spine at its posterior 

 corner ; angle of the praeoperculum with a spine directed downwards ; 

 tail without spines. The pectoi-al fin does not extend to the hind 

 margin of the tnink. ( Val.) 



Atlantic. 



4. Argyropelecus aculeatus. 

 Cuv. Sf Val. xxii. p. 406*. 



B. 9. D. 9. A. 14. P. 10. V. 7. 



The height of the body equals the distance between the posterior 

 margin of the praeoperculum and the root of the caudal ; tail very 

 slender. Mandible with a verj- obtuse spine at its posterior corner ; 

 praeoperculum with a S2)ine directed downwards. A double row of 

 spines along the lower side of the tail. {Val.) 



Azores. 



2. STERNOPTYX. 



Stemoptyx, Hermann ; Cuv. vS" Val. xxii. p. 412. 



Trunk much elevated and compressed, with the contracted portion 

 of the tail very short. The teeth in the jaws form several series, so 

 that the largest teeth are in the inner row. In other respects this 

 genus agrees with Argip-opeJecns. 



Atlantic. 



* This is the same species whicli is named A. cicaiifhiirus on p. 408. 



