No. 490] NOTES AND LITERATURE 



661 



integument of a Lycosa nidicola was removed, cariyino; witli it the 

 eight eyes. From the under surface of the j)n'i);irati()ii the retinae 

 and vitreous bodies were brushed away, Icavinir (,nly lenses in 

 position. The integument and lenses were mouiitcfl rijjoii the stage 

 of a microscope, beneath which a postal card was placed upon the 

 table. With a § inch objective, eight magnified inverted images of 

 the McKinley portrait could be seen so distinctly that the surrounding 

 inscription was legible. The vision of the spider depends, however, 

 upon its retina and central nervous system. A preparation of the 



image which is so small that it falls upon only one rod would be per- 

 ceived as a point. Dr. Petrunkevitch has calculated the distance at 

 which a spider can possibly recognize another spider, and in other ways 

 has studied the nature of spiders' vision. 



Professor E. L. Mark of Harvard University exhibited live Am- 

 phioxus from Bermuda. They are nearly transparent creatures about 

 two inches in length, which remain buried in the coarse shell sand 

 with their anterior ends projecting slightly from the surface. If 

 disturbed they dart through the water with the greatest rapidity and 



axis and radiate periplicrally ki the skin, and csjUM-ially K. thr jiriniiiivc 

 pores. These are chistcrs of pits siiri-oiiiidcd by tlic patclics of pi>:ni(Mir 



in the lateral line were iiidicatt'd in dissections and jihotouraphs. and 

 it was noted that the lateral line extendt-.l ont on the doixal lobe of tlie 



of the tail, as in other fislies. Professor XaVhtrieh i> >tn<lyin- fnnlxT 

 PfotVssor I'ocy. :m.l lias Inrn d.'s.nh.'d in twi^nty-fonr ^-enera of 



