FISfiES FROM NORTHEASTERN PACIFIC — CHAPMAN 535 



X. Head 2% to 3% in the length without caudal; origin of pelvic a 



little behind or below pectoral base; eye 5 to 6^^ in head- 



depth 3K to 4 in length; interorbital width 3 to S}i in head..'.M. microps 



XX. Head 2Jlo to 2% in length without caudal; origin of pelvic a 



little behind pectoral base; eye 6/5 to T^o in head; depth 3.2 



to 3.4 in length; interorbital width 2 to 2.4 in head M. cavemosus 



XXX. Head 2}i in the length without caudal; origin of pelvic a little 

 in front of pectoral base; eye 6 to 6>^ in head; depth S]4 to 4 



in the length; interorbital width 3 in head M. lugubris 



xxxx. Head 2 to 2% in length without caudal; origin of pelvic a little 

 in front of pectoral base; eye 8% to 9% in head; depth 3>^ in 

 length; interorbital width 2^ to 3 in head M. macrocephalus 



Named in reference to the cavernous nature of the bones of the 

 head. 



MELAMPHAES RUGOSUS. new species 



Figure 69 



Holoiype. — A specimen 94 mm in length without caudal, from sta- 

 tion 453D.T., taken June 16, 1931, latitude 55°32' N., longitude 

 136°25' W., U.S.N.M. no. 108141. 



Description. — Based upon the holotype, the only specimen known. 

 Dorsal rays III-12, anal rays 1-9; pectoral rays 13, pelvic rays 1-7; 

 caudal rays III-19-III; scales in a lateral series 25; gill rakers on the 

 anterior arch 9 above, 22 below. Proportions of the length without 

 caudal are: Length of head 2.7; snout to dorsal origin 2.0; snout to 

 insertion of pectorals 2.6; snout to insertion of ventrals 2.5; snout to 

 anal origin 1.6; greatest depth of body 3.4; length of pectoral fin 3.1; 

 length of ventral fin 5.2; length of caudal peduncle 3.5; base of dorsal 

 fin 3.9; base of anal fin 7.2. Proportions of the length of the head: 

 Diameter of eye 5.8; interorbital width 2.1; length of snout 3.5; 

 length of maxillary 2.3; length of pectoral fin 0.9; length of ventral fin 

 1.9; greatest depth of body 1.3. The caudal peduncle is 2.7 times as 

 long as the least depth. The maxillary extends to the posterior 

 border of orbit. The pectoral origin lies a little in front of the inser- 

 tion of the ventrals. The anal originates under the ninth dorsal ray. 

 There are scales on the operculum. The preopercular margin is 

 vertical. The head is rough and cavernous. A high thin ridge with 

 many small spines runs on either side of the top of the head from the 

 nape to a perpendicular through the anterior margm of the orbit; a 

 similar nearly horizontal ridge over the eye extends a distance equal 

 to the diameter of the eye anterior to the orbit; a third slightly oblique 

 ridge of the same length runs under the eye; and a fourth, less prom- 

 inent, ridge behind the eye joins the posterior ends of the supra- and 

 infraorbital ridges. A rostral spine is present (2.9 mm long). The 

 long gill rakers (longest 7 mm) are toothed on their inner margins. 

 Pseudobranchiae are present. The dentition is very weak. There are 



