520 PROCEEDINGS OF THE NATIONAL MUSEUM vol.86 



7.7; length of anal base 6.1; dorsal origin to base of middle rays of 

 caudal 2.3; anal origin to base of caudal 3.9; length of adipose fin 

 base 10.6. 



The body is covered everywhere with minute scales that can 

 scarcely be made out without the help of a lens. The head is naked 

 and bears no pronounced ridges. The snout is conical and pointed, 

 only slightly longer than the diameter of the large round eye. The 

 premaxillary reaches to a vertical from the middle of the eye and 

 excludes the maxillary from the upper jaw. The lower jaw projects 

 slightly. The premaxillary is completely toothed along its lower 

 edge with a single row of small, conical teeth. The dentary is simi- 

 lariy toothed on its anterior two-thirds. The symphyseal knob is 

 toothed and projects into a toothless cavity at the junction of the 

 premaxillaries when the mouth is closed. The vomer has a single 

 row of minute conical teeth on the anterior edge of the head of the 

 bone; there are no teeth on the shank. The palatines have an irregu- 

 lar row of minute teeth along nearly the whole length of each bone, 

 which is double on the anterior half of the bone and single posteriorly. 

 The entire dorsal surface is covered with small, widely spaced teeth. 

 The gill membranes are not united and are not attached to the isth- 

 mus. The gill rakers are long and slender. 



The dorsal fin is high and short and is inserted nearer to the taU 

 than to the snout. The adipose fin originates over the middle of the 

 anal. Its base is long; the fin is low and fimbriated. Neither the tip 

 of the adipose nor the rays of the anal, when depressed, reach to the 

 rudimentary rays of the caudal. The pectoral fins are inserted very 

 low, with the bases oblique and quite broad. The fin is the same 

 length as the upper jaw. The pelvic fins originate under the second 

 dorsal ray. Their rays are heavier and thicker than those of the 

 pectorals, and the fins are slightly longer than the latter. The anal 

 fin is long and moderately low and is inserted far back on the body so 

 that the distance from the anal origin to the base of the middle rays 

 of the caudal is the same length as the head, or 3.9 in the length with- 

 out caudal. The caudal fin is forked, with rudimentary rays dorsally 

 and ventrally, short weak rays in its middle and longer, stout rays 

 forming the dorsal and ventral lobes. The anus opens directly before 

 the anal fin. 



Remarks. — Two other species of this genus, Siidis ringens and 

 S. coruscans, have been described from the west coast of the United 

 States by Jordan and Gilbert (1881a and 1881b), the former from 

 southern California and the latter from the Straits of Juan de Fuca. 

 From both of these the present species can be easily distinguished. 

 In Sudis squamosa the greatest depth is contained in the length without 

 caudal 7.8, the length of the head 3.9, the snout to anal 1.3; the upper 

 jaw is contained in the head 2.2, the length of the caudal peduncle 3.1; 



