FISHES. 129 



Family, GASTEROSTEHX3E. 



26. Gasterosteus iusculptus Rich.- 



Gasterostens inscittytus RICH., Last Arc. Voy., 1855, p. 356, pi. xxv. 

 Tlie types were from ISorthuinberlaud Sound, lat. 76 53' N. 



27. Gasterosteus pungitius Linn., sub-species brachypoda Bean. 



lu small streams 011 tlie sides of Oosooadlin Mountain, and in a little 

 pond on the top, 1,500 feet above tide-level, Mr. Kumlien collected 

 numerous examples of a inany-spined stickleback, which resembles Gas- 

 terosteus pungitius Linn., in most particulars, but may be readily distin- 

 guished from it by its very short ventral spines. The tables of measure- 

 ments and radial formula appended will show other differences, which 

 are, however, not so important. 



Description. The greatest height of body is contained 5| times in its 

 length to origin of middle caudal rays (in gravid females, 4J times) ; the 

 greatest width, 10 times (in gravid females, 8 times). The height at ven- 

 trals is contained of times in length of body (in gravid females, 5 times or 

 slightly less). The least height of tail equals half the length of the first 

 dorsal spine. The length of caudal peduncle is | of length of body. 



The length of head equals 4 times the length of upper jaw, and is 

 from J to 2% of length of body. The greatest width of head nearly equals 

 length of middle caudal rays. The distance between the eyes equals 

 the length of snout, which equals the length of antecedent spine of soft 

 dorsal. The length of the operculuin equals the length of ventral spine, 

 which is slightly less than a third of length of head. The length of 

 mandible equals the long diameter of the orbit. 



The distance of the spinous dorsal from the snout is from J to -5^ of 

 length of body, and is almost uniformly less than its length of base. The 

 first and second spines of the dorsal are equal in length, and are about 

 g as long as the ventral spine. The last spine of the dorsal is slightly 

 less than the first. The antecedent spine of the second dorsal is some- 

 what longer than the first of the spinous dorsal, and half as long as the 

 first ray following it. The first ray of the soft dorsal is contained 8J 

 times in length of body, and is three times as long as the last ray. 



The distance of the anal from the tip of snout equals f of length of 

 body 5 its length of base is twice the length of its first and longest ray, 

 and slightly less than J of length of body. The anal spine is half as 

 long as the first anal ray (in young individuals, f ). 



The length of the middle caudal rays is contained 8J times in length 

 of body ; the length of external rays, 7 j times. 



The distance of the pectoral from the tip of snout is contained 3 J times 

 Bull. Xat. Mus. Xo. 15 9 



