Jordan and Evermann. — Fishes of North America. 2109 



brane, the margin thus formed sometimes incised, producing short, rounded 

 lobes; first spine highest, its height contained 4j in body, the succeeding 

 spines gradually growing shorter, the sixth contained 11^ times in body. 

 Height of second dorsal near its middle, 3 in head; dorsal and anal 

 joined by membranes to base of caudal, the anal more broadly joined than 

 the dorsal, attached to basal fifth of lowest caudal ray; caudal rounded 

 posteriorly, its length 4* in body; origin of anal below first ray of sec- 

 ond dorsal; height of anal a little less than that of dorsal; pectoral 

 extending to a vertical crossing body halfway between anus and origin 

 of anal fin ; length of pectoral 5^^ in body, its upper part rounded posteri- 

 orly ; the fifth, sixth, and seventh rays from below elongated, with exserted 

 tips, forming a short lobe. Long diameter of ventral disk 6 in body. 

 Vent slightly nearer to margin of disk than to origin of anal fin. Color 

 bluish slate, lighter along middle of sides; belly and gill membranes 

 whitish ; pectorals, anal, and posterior half of dorsal very narrowly edged 

 with white; rays of first dorsal indistinctly barred. In the following 

 table the measurements of 3 specimens are expressed in hundredths of the 

 length of the body : 



No. 1. No. 2. No. 3, 



Length, in luillimetera, to base of caudal fin 



Length of head in body 



Depth of body 



Distance from snout to dorsal 



Distance from snout to anal 



Depth of caudal peduncle 



Lengtli of snout 



Diameter of eye 



Width of month 



Width of gill opening 



Height of first dorsal ray 



Height of dorsal fin near middle 



Height of anal 



Length of pectoral 



Longitudinal diameter of disk 



Length of caudal 



Number of dorsal rays 



Number of anal rays 



Number of pectoral rays 



Number of caudal rays 



74 

 7 

 20 

 16 

 19 

 VI, 26 

 24 



50 

 27 

 23 

 34 

 48 



8 

 11 



5 

 12 



5 

 22 



8 



7 

 21 

 16 

 20 

 VI, 26 

 23 



Keoliparis rutteri is closely related to the Atlantic species, Neoliparis 

 atlanticus. It difters from it in the longer head, and the comparatively 

 larger ventral disk. The 2 species differ from all other known species of 

 the genus in having the dorsal spines in the male greatly elevated and not 

 connected by membrane except at extreme base. From N. Jlora' and N. 

 grecni, N. rutteri difters also in having a much smaller gill opening and 



