Report of a Mission to Guam. 109 



Dorsal, anal and caudal dark, the dorsal with three or more blue 

 lines running through it and terminating at the acute posterior 

 angle of the fin. The anal has a narrow subterminal line of black, 

 while tip of fin is bluish — the posterior part forms an acute angle. 

 Caudal fin deeply lunate, the upper lobe the longer. There is a 

 .semi-lunar blue band about the middle of the caudal. Caudal 

 peduncle strong, and armed with one white movable spine, con- 

 siderably longer than the width of the eye. Variations: In spirits 

 the bright canar}' yellow ground color fades into a dirty white. 

 Guam specimens show a considerable variation in the arrangement 

 of the blue lines about the base of caudal fin. They also fail to 

 show the concentric arrangement of the blue lines in the dorsal fins 

 as figured in "Fisches d. Sudsee," Vol. I., Haft IV. Seven speci- 

 mens, length 4-1 1 inches, were taken inside the reef, Agaiia, Guam, 

 July 9, 1900. Hab. Polynesia, Marianas. 



205. Teuthis aliala Linn. 



Head 3.66; depth 1.50; eye 3.50; interorbital 3; D. ix 29; 

 A. Ill 27; V. I 5; P. 16. Scales minute. Bod}' elevated and com- 

 pressed. Snout slightly concave ; jaws with 5 elobate teeth on 

 each side. Caudal peduncle about equal in height to length of its 

 spine. Branchiostegals5. Pseudobrauchiae developed. Fins: Cau- 

 dal lunate, its longest ray 3.50 into length of fish. Pectorals equal 

 to length of head; the ventrals are about one-third shorter. The 

 posterior margins of the dorsal and anal are rounded. Color in 

 spirits: Blue-black, a sub-crescentic area of Indian red just below 

 the eye. A white ring around mouth. A line of yellowish white 

 along the bases of anal and dorsal; posteriori}' these lines broaden 

 out and occupy about a third of the fins. Caudal is yellowish white 

 with a white band and a black posterior margin. Spine on free 

 portion of tail yellow. Pecftorals and ventrals black. Dorsal and 

 anal black, excepting the yellowish white marking mentioned 

 above. Twelve specimens, one 7 inches in length, the others (very 

 young) 1-2 inches in length. Agaiia, Guam, July 14, 1900. Hab. 

 Western Pacific, Polynesia, Marianas. 



Genus CTKNOCH^TUS Swainson. 



306. Ctenochsetus strigosus Bennett. 



Head 4 ; depth 2 ; eye 3.50 into head ; D. viii 30; A. in 27; 

 V. I 5. Scales small, about 19 between lateral line and the base of 

 the last dorsal spine. Teeth setiform, movable with their outer 

 end dilated and bent in and notched; 42 in upper row, 46 in lower. 

 Color in spirits: Brown, faint traces of slight blue lines under the 

 pecloral fins. Fins all black, except pecflorals which are slightl}^ 

 yellowish blue. Caudal deeply lunate. The posterior parts of 

 dorsal and anal not rounded, but forming very acute angles. Caudal 

 peduncle stout and armed with movable black spine 1.30 times as 



