THE FISHES OF BERING SEA. 441 



The species may be diagnosed as follows: Cbondrocranium well developed; 

 superior maxillary edentulous: pointed teeth on vomer and anterior portion of pala- 

 tines; lower jaw very deep; pointed teeth on dentary; articular well developed. 

 Vertebral formula 2C precaudals, 22 caudals, plus 1 hypural; last 4 precaudals with 

 short, wide hypapophyses; other hypapophyses long; neural spines of first 22 vertebrte 

 double, remainder confluent; an epineural present and confluent with basal part of 

 neurapophysis on many of the anterior vertebrre ; short transverse jjrocesses, directed 

 downward from lower part of anterior vertebrsie. Vertebrte simple; anterior but very 

 little shorter than the posterior; centra not sculptured, but bearing many fine longi- 

 tudinal ridges. 



Total length of fish, 3J to 4i inches. The seal fish, as it may well be called, from 

 the large numbers eaten by the fur seal, has been found in the stomachs of seals taken 

 between latitude 54° 43' K to 55° 29' N. and longitude 167° 41' W. to 170° 53' W. 

 Seals taken on August 20, in the vicinity of 55° 24' E"., 167° 49' W., contained large 

 numbers of this little fish, and it was abundant September 1 to 15, in 55° 29' N., 

 170° 26' W. As these localities lie outside the 100-fathom line, it would seem that 

 Therohromus inhabits the open sea, but swims near the surface. (F. A. Lucas.) 



Details of structure are shown on Plate XLVii. 



Explanation of abbrerialions on plate shotving details of structure. 



Art Articular. Pop Preoperculum. 



Den Dentary. Prf Prefrontal. 



Hy Hyoid. PT Post temporal. 



Hym Hyomandibular. , Ptf Post frontal. 



lop Interoperculum. Pto Pterotic. 



Mx Maxillary. Qu Quadrate. 



Na Nasal. SO Supra-occipital. 



Op Operculum. Vo Vomer. 



Pal Palatine. 



Family MICROSTOMATID^^. 



40. Bathylagus borealis Gilbert. 



From Bering Sea, north of Unalaska, Albatross station 3,027, in 322 fathoms. 



Family MYCTOPHID..^. 



41. Nannobrachium leucopsarum (Eigenmann and Eigenmann). 



Eecorded by Dr. Gilbert from Bering Sea, near Unalaska, in 225 to 1,625 fathoms. 

 The original locality was the Cortez Banks, near San Diego. 



42. Nannobrachium nannochir (Gilbert). 



Found in the North Pacific and Bering Sea in many localities in 313 to 1,625 

 fathoms. The original type came from the Santa Barbai-a Channel. 



Family CHAULIODONTID.^. 



43. Cyclothone microdon (Giinther). 



One specimen from station 3634, off Bogoslof Island, in 664 fathoms. The species 

 is widely diffused through the North Atlantic and Pacific. Dr. Gilbert records it 

 from off the Pribilof Islands in 1,033 and 1,625 fathoms. 



