1928 Bulletin 47, United States National Museum. 



the presence of serrations on all the dorsal spines and on the first soft ray, 

 and the emargination of the caudal fin. Alaska, (it pica v, saw; i6t:iov, 

 sail, referring to the dorsal fin.) 



2304. PKIONISTITJS MACELLUS, Bean. 



Head4|; depth 8; branchiostegals6. D.XI-29; A. 29; C. 11 (developed); 

 P. 10+5; V. I, 3; lateral line 51. Body slender and elongate, its great- 

 est height equaling length of lower jaw. The height at the ventrals 

 equals \ of the distance of the pectoral from the tip of the snout, and is 

 contained 8| times in the standard body length ; caudal peduncle shorter 

 than in Trie/lops pingeli, its least height equaling width of interorbital 

 space; length of caudal peduncle, measured from end of anal fin to origin 

 of middle caudal rays, 7 in length of body ; no bony plates along the dor- 

 sal fins; lateral line with well-developed osseus tubercles, furnished below 

 with ciliated scales similar to those of Triglops pingull; the breast, how- 

 ever, unlike that of the species just named, is naked. The head agrees in 

 the main with that of Triglops pingell, but is not so deep nor so .wide; the 

 jaws are about equal in front. Greatest width of head slightly more than 

 | its length and 7 in body. Interorbital width, measured on the bone, 

 about 3 in orbit, which equals the snout in length. On the top of head, 

 close behind the orbits, are 2 short, interrupted furrows similar to those 

 observed in some species of Prionotus. The length of the upper jaw is 

 contained 2 times in that of the head, equals that of the postorbital part 

 of the head, and is contained 9 times in the unit of length. The maxil- 

 lary extends nearly to the vertical through the middle of the eye, the 

 mandible nearly to that through the posterior margin of the eye. The 

 length of the mandible is about that of the head. The dentition is 

 the same as in Triglops pinyeli. The length of the eye equals that of the 

 snout, and is contained 3 times in the length of the head. The branchi- 

 ostegal membrane is not very deeply emarginate, and is free from the 

 isthmus; slit behind fourth gill a little more than as long as the pupil; 

 gill rakers on the anterior arch quite rudimentary, their length being 

 rather less than their width, 8 below the angle. Distance of spinous dor- 

 sal from tip of snout equals that of pectoral from same point, and is 4 in 

 body ; base of this fin twice as long as longest ray of soft dorsal ; length of 

 first spine equals that of first ray of soft dorsal, and is contained 3 times 

 in that of head; fourth spine longest, its length being contained 2 times 

 in that of head; last spine very little more than as long as first; first 

 spine serrated along lower | of its anterior edge, and all the following 

 spines, except the last, are similarly armed along the anterior edge of their 

 exserted tips ; even the first ray of second dorsal is thickly set with minute 

 spines; length of base of soft dorsal 2 times in body; its first ray equal 

 to longest anal ray or the first spine, which equals distance from snout to 

 orbit; fourth, fifth, sixth, and seventh rays longest and about equal in 

 length, twice as long as last ray and as long as soft dorsal base; mem- 

 brane behind last dorsal spine extending to base of first soft ray; origin 

 of anal fin vertically beneath base of second soft ray, the distance of the 

 anal origin from the snout less than length of anal base; length of first 



