200 THE PLAGIOSTOMIA. 



pectorals nearly half of the length, outer angle broadly rounded, inner angle 

 much produced, end reaching below the dorsal spine. Dorsal spines moderate, 

 anterior exposed one third and posterior two fifths of the height. First dorsal 

 entirely in the forward half of the total length, origin behind the bases of the 

 pectorals above their outer angles, height about half the length of the base 

 including the spine. Second dorsal larger than the ventrals, as high as the first 

 dorsal, base one fourth shorter than the first, hinder angle acute reaching over 

 more than two thirds of the distance from the base to the caudal. Caudal deep, 

 length less than one fourth of the total, depth less than half of the length, sub- 

 caudal lobe of moderate size, a notch at end of subcaudal. Scales rough, each 

 with a strong median and two weaker lateral cusps on the hinder edge extended 

 from keels on the crown. On the white scales scattered over the body the keels 

 appear to be more numerous and to vanish before reaching the hinder part of 

 the scale. 



Dark greyish brown, light below, lighter in an area behind the orbit and 

 another in the middle of the forehead. 



Total length of the type 32?, snout to vent 20, snout to dorsal 11 1, snout to 

 pectorals 7, snout to mouth 3, and length of caudal 7? inches. 



Japan. Alan Owston. 



Centrophorus atromarginatus, sp. nov. 



Plate 13, fig. 1-4. 



Body subfusiform, slightly compressed, moderately robust. Head long, 

 depressed, broad; snout narrowing rapidly in front of the eyes, blunt on the end, 

 flattened beneath, little longer than the base of the dorsal including its spine. 

 Distance of nostrils from one another equal their distance from the end of the 

 snout, or three fifths of that from the mouth; valve with a rounded lobe at the 

 base of which is a lobule. Eye large, length of orbit equal the preorbital length, 

 hind corner above angle of mouth. Mouth little curved, with a long straight 

 groove and labial folds at each angle; width nearly two thirds of the preoral 

 length. Teeth compressed, in f§ rows; in eight or ten of the longitudinal rows 

 on the upper jaw they are a trifle smaller and nearly erect, from these they be- 

 come more oblique; on the lower jaws the teeth are larger and the cutting edges 

 are more nearly horizontal. Spiracle large, semilunate, above and backward 

 about one diameter from the corners of the eyes. Gill openings moderate, 

 foremost about one third the length of the orbit, hindmost much wider, in front 



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