214 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



A. lephirus is distinguisbed from A. lupus by (1) its uniform brov/ii 

 color, (2) its scanty squamation, (3) its slender tail, (4) its greater num- 

 ber of dorsal and anal rays. It resembles A. lupus in many respects, 

 but differs from it as widely as lupus does from latifrons. 



In the measurement tables wliich follow the hundredths of length are 

 calculated from the total length without the caudal. 



A key to the species of Anarrhichas is given. In this no reference is 

 made to the dcnticulatus of Kroyer, because the slight descriptions 

 which we have of this species do not serve to distinguish it fi-om 

 latifrons. The species known on the American coast as A. latifrons is 

 evidently the latifrons of Steenstrup* & Collett,t and I cannot see that 

 it differs from the denticulatus of Giinther| or of Kroyer.§ 



Table of Meusurements. 

 Species : Anarrhichas lepturus. 



Current number of specimen 

 Locality 



23510. 



St. Michael's, 

 Alaska. 



21509. 



St. Michael's. 

 Alaska. 



MilU- 

 metres. 



lOOths 



of 

 length. 



Milli- 

 metres. 



lOOths 



of 

 length. 



Extreme length 



Length to origin of middle caudal rays 



Body : 



Greatest height 



Greatest width - 



Height at base of pectorals 



Least heiglit of tail 



Head : 



Greatest length 



Distance from nostril to anterior margin of orbit 



Greatest width • 



Width of interorbital area 



Length of snout 



Greatest height 



Length of upper jaw 



Length of mandible 



Distance from snout to orbit 



Diameter of orbit 



Dorsal : 



Distance from snout 



Greatest height 



Length of longest ray 



Anal: 



Distance from snout 



Length of first ray 



Length of longest ray 



Caudal : 



Length of middle rays 



Pectoral : 



Distance from snout 



Length 



Dorsal 



Anal 



Caudal 



Pectoral 



495 

 455 



*Noget oni Sliegtcu Soulv &c., 187(), p. 43 (Vidensk. Medd. fra den uaturlu.stori.ske 

 Foreuing i Kjobeubavu, 1876, p. 201, tab. iii,ligs. 3, 3', & 3"). 

 tChra. Videusk.-Selsk. Forliandl. 1879, No. 1, p. 46, pi. ii, fig. 2. 

 tCat. Fish. Brit. Mus. iii, 1861, p. 211. 

 ^Gaimard, Voy. eu Scand. etc., Zool., Poiss., pi. xii, fig. 1 (no description i 



