;>12 KXPEDITIOX OF TIIH • ALIiATROSS," 1S90-1900. 



Xo. A23, a male specimen, 122 IiicIk^s long, from Rangiroa, Fauinotu Is- 

 lands. This specimen has head 4.6 in length: depth 2.67; eye 4 in head; dis- 

 tance fnim tVont of eye to tiji of hoi'n 'A.'2 in l(>ngth; eye to ti])or ui)1)(m- li]) l.ti 

 in head; dorsal VI, 28; anal II, 21). 



No. A23 is a male and has the snout mucli longer than the other sjiecimens, 

 its length nicasm-ed from underneath is 22 inches long and just e(|ua!s length 

 of head; the two spines on each side of the caudal jieduncle are longer than those 

 in the other specimens, and are close together; their distance apart being less 

 liian theii- height; they are hi'oad. sharp and hook(>(_l forward, the ]iosterior 

 one the larger; its height measured on the anterior edge is slightly less than its 

 base; soft dorsal and anal, when depressed, reach the bases of upper and lower 

 caudal rays respectively; caudal tnuicate. 



(Ii'ound color, a dark brown on i)ack, graduated to a lighter brown on side 

 and belly; horn marked by narrow- longitudinal dusky stripes; cheeks, pre- 

 >jri)ital, and ])reopercle covered with small round dark spots; o])ercle with rovnid 

 dark spots on its upper part, becoming oblong and line-like on lower i)ortion; 

 opercular membrane or flap creamy whiter back thickly covered with very small 

 round dusky spots, becoming slightly vertical, oblong in the region of lateral line, 

 and increasing in length on the sides, anteriorly forming linear oblong spots, 

 and on tlie middle of the body narrow vertical bands; just anterior to caudal 

 spines the spots are round; these markings reach a horizontal line extending 

 from the lower base of the jxM-toral posteriorly, to about the beginning of the 

 posterior 4lh of the bas(> of the soft anal; base of caudal s])otted; doi'sal and 

 anal i)lain light brown, the ineinbraiie of sjiinous jiortiun shows traces of a 

 narrow black margin; pectoral light brown, with indication of a lighter margin; 

 caudal greenish yellow, with a dark grayish brown terminal margin; l)reast, 

 throat, and abdominal region, |)lain light hrowii, slio',\ing traces of a few very 

 small dusky darker s])ots just below pectoral. 



Nos. A lo and A IS, both females. The horn of A lo, measured I'm in below, is 

 l.o6 inches long and is 1.5 in head; the horn of .MS is \ .'A7 inches long and is 

 1.71 in head. The spines on caudal peduncle of .\l.") are smaller and farther 

 apart than in .V23; their distance apart being much greater than theii' height 

 or the length of their base; the spines aic rounded and not triangular as in A2U, 

 and about half as high as length of base; slightly inclined forward, but not 



