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PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 50. 



longest anal ray 3 in head, fin slightly lower posteriorly; pectoral 

 rounded; ventrals just reaching anus; caudal rounded. 



Upper lateral line ending under fourth ray from last of second 

 dorsal, and overlapping lower lateral line by four scales, sometimes 

 not at all. 



Scales ctenoid; interorbital scaled to between nostrils in some 

 specimens, but half in others, and often covered by widely scattered 

 scales; frequently entirely naked as far back as occiput save for a 

 single, occasionally deeply embedded, but constantly present, scale 

 between anterior borders of eye ; whole of opercle with scales as large 

 as those on body, preopercle, interopercle, and subopercle naked; 

 cheeks with minute scales above on area of varying extent; scales 

 between occiput and dorsal one-fifteenth size of those on the body; 

 space before each ventral base naked to isthmus. 



Color of majority of specimens much faded, leaving the fii'st dorsal 

 dark, the second dusky, and the anal with prominent oblique stripes ; 

 color of better preserved specimens variegated, especially in young; 

 four irregular transverse bands on body margined with white, es- 

 pecially laterally; remainder of body spotted with dark scales; 

 upper surface of snout covered by sharply margined spots; a dark, 

 somewhat indefinite band extending downward and backward from 

 preorbital and another from center of eye, with lighter center; upper 

 half of pectoral base traversed by irregular dark lines surrounding 

 lighter area; a dark bar across base of caudal, fading distally on 

 rays ; dorsal with indistinct dark oblique stripes, those on anal much 

 more distinct; caudal with several well-defined crossbars. 



The variation in the scaling of the head in this species is certainly 

 remarkable, but it is evident enough that it is simply variation. All 

 intergradations and degrees of scaling are to be seen, correlated with 

 no other character as far as may be discovered. It is evident that 

 Smitt was correct in calling his three "forms" members or parts of a 

 single species, and Boulenger as plainly incorrect in referring the 

 scaleless headed forms to Notothenia cornucola, as may be seen by 

 reference to the differences between those species. 



Table of measurements ' and counts of specimens of Notothenia sima Richardson with 



scaled and scaleless heads. 



Author's number 



Scales on back of head 



Length to baseof caudal. mm. . 



Head length 



Body depth 



Eye diameter 



Snout length 



Maxillary length 



Interorbital width 



Dorsal spines number.. 



Dorsal ravs 1 do — 



Anal rays 



Scales in lateral line 



Scales in lateral series . . . 



Scales in transverse 



Pectoral length 



Ventral length 



('audal peduncle depth.. 



Number of gill rakers 



Distance snout to dorsal. 

 Scales occiput to dorsal.. 

 Distance snout to anus. . 



1 Measurements given in hundredths of body length. 



