580 TEN YEARS IN SWEDEN. 



weaponed with, hard bony plates instead of teeth; two 

 dorsals, the first very high, with a high spine in front ; the 

 second one, which is continuous, is low like the anal, and 

 both gradually diminishing, end in the thin-pointed tail; 

 large sea fish; habitat North Sea and Mediterranean. 

 This family stands much nearer to the rays than the stur- 

 geons. 



164. CHIMERA MONSTEOSA, L. Yanlig Hafmus. The 



Northern Chimsera. D. 



Body spotted with silver and brown ; a brown band 

 along the back, and a blackish rim along the dorsal ; 

 length 2 to 3 ft. ; is precisely identical with the Medi- 

 terranean fish. 



Is taken often off the coasts of the North Sea, Cattegat, 

 and Sound, in 40 to 100 fathoms of water, but never in the 

 Baltic. 



2. Cartilaginous fishes, with fixed gills. 



The gills are grown up fast with the skin, so that the 

 water which is taken into the mouth goes out between them 

 through several slits lying in a row. No gill cover. 



SHAKES . 

 Gen. SualuS L. 



Body elongated, rough ; tail thick, fleshy, and muscular ; 

 gills on the sides of the neck, not under ; eyes on the sides 

 of the head, and not above as in the rays ; teeth flat, 

 pointed or sharp edged, lie in several rows, usually four 

 above and three below. 



All the known Scandinavian species have two dorsals and 

 so-called spiracula (spout holes) . 



Sect. 1. PLAGIOSTOMI. Broad-mouthed Fishes. 



Fam. SQUALID^E. 1. Dog Fish. 



A. Sharks with an anal fin. 



First dorsal behind or over, never in front of the ven- 

 trals; tail even on the edge; snout short; gill openings 



