248 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



ing much farther back than the short palatine bauds, and by the pres- 

 ence of ten or twelve vertical black bands on the sides of the body. 



In the example from Davis Straits there are 5 strong canines ante- 

 riorly in the upper jaw, and i in the lower. The vpmer has 6 strong 

 molars in an irregular double series, and each palatine is armed with 3 

 similar teeth. Xo lateral series in the upper jaw; the lower jaw with 

 about 9 molars in a single series on each side, and 2 or 3 inner teeth 

 anteriorly. The length of the upper jaw is slightly greater than one- 

 half of the length of the head. 



The length of the head is contained ^ times, and the greatest height 

 of the body 5^ times in the length to base of caudal. The eye is slightly 

 greater than the snout and less than the interorbital width, its greatest 

 diameter being contained 5J times in the length of the head. The 

 longest dorsal ray is not quite one-half the length of the head. The 

 pectoral is large ; its length is contained If times in that of head. 



D. 74 ; A. 45 ; P. 20. 



Ammodytes dubius Eeinh. 



Ammodytes dubius Reixhardt, Dansk. Vidensk. Selsk, Afhaud., vii, 1838, 

 p. 132 ; GUXTHER, Cat. Fisb. Brit. Mns., iv, 1^62, p. 387. 



A number of examples of this species were obtained by Mr. ]!f . P. 

 Scudder, July, 1870. They were taken from the stomach of a halibut 

 caught in Davis Straits, near Holsteinburg, Greenland. The species is 

 readily distinguished from A. americanus by the radial formula, the 

 number of lateral folds, and the proportional length of the head. 



28633 {a). Davis Straits. N. P. Scudder. D. 66; A. 32; lateral 

 folds, 149. Length, 190 millimeters. 



28033 {b). Davis Straits. N. P. Scudder. 

 folds ca., 150. Length, 192 millimeters. 



28633 (c). Davis Straits. X. P. Scudder. 

 folds ca., 145. Length, 180 millimeters. 



28633 {(1). Davis Straits. X. P. Scudder. 

 folds, 152. Length, 202 millimeters. 



28633 (e). Davis Straits. N. P. Scudder. 

 folds ca., 145. Length, 190 millimeters. 



In all these examples the dorsal fin begins over the posterior third of 

 the pectoral fin, which is equal in length to the postorbital part of the 

 head and to the greatest height of tlie body. The length of the head is 

 contained 5i to 6 times in the length to the caudal base. The diameter 

 of the eye is one-half the length of the snout, which is about one-third 

 the length of the head. 



A young example of this species obtained in Godhavu Harbor, 

 Disco Island, August, 1883, resembles A. americanus in the number of 

 fin rays and the proportional length of the head, yet this may be owing 

 to the incomplete development in the young fish. A distinctive feature 

 is the number of body folds. As many as 155 can be plainly counted, 



D. 



D. 



Q>o) A. 

 Qo; A. 



D. 67; A. 



34; lateral 

 33; lateral 

 36; lateral 



D. 66; A. 33; lateral 



