204 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



it is readily distinguished from the former by the features of the head, 

 aud from the latter by the caudal structure. 



Parmaturus pilosus, sp. nov. 



Head and snout shorter, nostrils closer to the mouth and spines more pilose than 

 on Pristiurus melastomus Raf. ; in these and other features somewhat nearer to 

 Catulus, Scjilium. Dorsal fins subequal ; origin of first very little backward of that 

 of the ventral, base reaching little farther back than that of the latter; origin of 

 second dorsal above the middle of the base of the anal and end of tlie base above 

 tliat of the same fin. Teeth compressed; cusps in variable numbers, upper teeth 

 commonly with six and lower most often with five. Labial folds equal, short, one 

 fourth as long as the jaw. Nostrils wide, close to the mouth, equal in width to 

 the internarial space or twice their distance from the edge of the mouth. Spiracles 

 small, directly behind and distant one diameter from the eye. Gill clefts small, 

 the hindmost two smallest, and situated above the base of the pectoral. Entire 

 length of the pectoral fin hardly half the distance between its base and that of the 

 ventral. Scales minute, velvety, each with a long, strong median cusp at each 

 side of the base of Avhicii is a rudiment. 



Uniform brown on back and fins, latter with black margins; light below, the 

 lighter color extending up behind and above tiie pectoral firs. 



No. 1107, Mu.'5. Comp. Zool. 



Hab. Lat. 34° 59' N. ; Lon. 139° 31' E. " 430 fathoms. Golden Hind." 



Centrophorus, M. & H., 1837. 



Present knowledge will hardly sanction acceptanv^e of this genus as 

 constituted by Giinther, 1870. The species appear to group themselves 

 in four distinct genera : (1) Centrophorus M. & H., 1837, of -which 

 Squalus granulosus Bl. & Sch., 1801, is the type, (2) Acanthidium LoAve, 

 1839, with the type species A. calceus Lowe, 1839, Deania J. & S., 1902, 

 being a synonym, (3) Scymnodon B. & C, 1864, as represented by S. 

 ringens B. & C, 1864, and (4) Centroscymnus B. & C, 1864, typified 

 by C. coelolejns B. & C, 1864, and including the. species of Zameus 

 J. & F., 1903. Besides the new species added to these genera it is 

 found that the affinities of Squalus urjato Kaf., 1810 (Jipinax uyatus 

 Bonap., Acanthias uyatus M. & H.), are such as to remove it from the 

 geinis Acanthias, Squalus of later authors, and place it among the species 

 of Centrophorus. All of these, with some differences of inclusion, are 

 genera established before the publication of Giinther's arrangement. 



Centrophorus acus, sp. nov. 



In general the outlines, dentition, and squamation resemble those of C. granulosus 

 Bl. & Sch. Dorsal spines projecting beyond the skin. Teeth f|, upper the more 

 erect and narrower, lower with the cutting edge directed obliquely toward the 



