Royal Society. 225 



siiiuatctl internally ; secondaries saffron -yellow, with a wider 

 brown border ; body tinted with saffron ; otherwise as in the 

 male: primaries below almost as in the male, but with six 

 marginal yellow spots ; secondaries saffron -yellow, with a 

 broader brown border. 



Expanse of wings 2 inches 9 lines. 



Hah. Bugaba, Veragua. Type, coll. Druce. 



Var. ? monstrosa. 



6 . Smaller and altogether paler than the preceding ; pri- 

 maries aljove white, the apex with a broader and more 

 strongly sinuated black-brown border ; secondaries yelloM'ish 

 white, becoming sulphur-yellow close to the margin, which 

 has a broader border than in the preceding species ; primaries 

 below also paler, excepting at apex, with no apical yellow 

 spots, and a more slender discocellular bar ; secondaries with 

 broader marginal border and with the orange confined to the 

 base of costa. 



Expanse of wings 2 inches 6 lines. 



Hah. Bugaba, Veragua. Type, coll. Druce. 



The above may turn out to be distinct from D. florinda. 

 It is not only smaller and different in coloration, but the 

 primaries are narrower and their outer margin is more di- 

 stinctly incurved. Both forms approach D. isandra in form 

 and marking ; but in the ground-colour of the wings D. 

 fiorinda 6 is like D. ixdyhymnia^ D. florinda $ more like 

 D. leucanthe ? , and var. ? monstrosa like D. pantoporia S • 



PROCEEDINGS OF LEARNED SOCIETIES. 



ROYAL SOCIETY. 



December 17, 1874. — Joseph Dalton Hooker, C.B., President, in 



the Chair. 



" Preliminary Note upon the Brain and Skull of Amphioxus 

 lunceolatus.^' By T. H. Huxley, Sec. R.S. 



The singular little fish Amphwxus lanceoUitus has been uni- 

 versally regarded as an extremely anomalous member of the Ver- 

 tebrate series, by reason of the supposed absence of renal organs 

 and ot" auy proper skull and brain. On these grounds, chiefly, 

 Agassiz proposed to separate it from all other fishes ; and Haeckel, 

 going further, made a distinct division of the Vertebrata (Acramn) 



