74 THE ROYAL SOCIETY OF CANADA 



A few ctenoid scales in and behind axil of pectorals. The patch of 

 ctenoid scales on sides of back cover about half the space between 

 lateral line and dorsal. It is close to dorsal until about the front of 

 soft dorsal when it begins to bend downward and finally meets lateral 

 line at upper angle of opercle. The two patches of scales meet behind 

 dorsal fin and in front merge in the scaling of top of head. 



One row of teeth at sides of jaw, and several rows at centre of 

 jaws enlarged. A few small teeth on the inner side of the jaws. The 

 largest teeth are near the centre of the jaws and are strongly hooked. 

 A few cardiform teeth on vomer and palatines. 



Nasal spines short but distinct, with the end of premaxillary 

 coming up between them so as to appear like a third spine. Preoper- 

 cular spine bifid with apparently two or three weak spines below it. 

 No other spines apparent on head. All the spines are covered with 

 thick skin. 



Opercle with a long flap, almost as in Lepomis. Gill membranes 

 united and free from the isthmus. Between the nasal spine and the 

 eye on each side is a large plumous tentacle about half as long as 

 head. Behind eye on each side is a similar one about as long as eye. 



A row of simple cirri along lateral line, one or two on nearly 

 every scale, and a few scattered ones on head. 



Membrane of anal and ventral fins very wide and rounded be- 

 tween the distal ends of the rays so that the ventrals appear spatulate 

 and the anal is much fluted along the margin. This is hardly sufficient- 

 ly indicated in the figure (Plate II). 



The anal papilla is very large. 



Colour in alcohol, light brown with four dark blotches along the 

 base of soft dorsal and one at centre of base of spinous dorsal. These 

 blotches extend just below the edge of the band of scales. Below this, 

 the side is vermiculated with darker except on the posterior half of 

 the tail below the lateral line where there are about six irregular cross 

 bands. Fins all dusky, the pectoral showing some indications of 

 mottling. The anal fin is covered with small, evenly spaced white 

 spots, each with a black ring, a row along each fin ray and two or three 

 irregular rows on the interradial membrane. 



Type No. 82169, U. S. Nat. Mus. C. H. Young, collector. 



Named in honour of John Macoun, who had charge of the collect- 

 ing. 



Pterygiocottus may possibly be a male of some well known species, 

 as a related form has been described by Starks^ as perhaps the male 

 of Axyrias harringtonii. 



» Ann. Carnegie Mus., Vol. VII, No. 2, p. 189, 1911. 



