SOME ADDITIONAL REMARKS on the SENSES, 

 HABITS, and ECONOMY of SPIDERS. 



SENSES OF SPIDERS. 



The absence in the "Introduction" of any special reference 

 to some of the " Senses of Spiders" having been noticed by a 

 friendly critic, I will not pass it over quite in silence, though 

 very little is really known in reference to this part of tho study of 

 Arachnids. 



SIGHT. 



Spiders undoubtedly possess the sense of sight in a very 

 strong degree ; but within what limits of distance, or with what 

 magnifying power, we have, so far as I know, very littlo proof 

 either from observation or anatomy. It is probable that many 

 spiders see best with a diminished light, and Mons. Eugene Simon 

 attributes difforent powers of vision to the different eyes. He 

 believes (as already noticed in the "Introduction") that some(those 

 of a dark colour) are endowed with power to see best in daylight, 

 while those of a white or pearly hue he considers to be intended for 

 use at night, whence he calls the former les yeux diumes, and the 

 latter les yeux nocturnes. Most spiders possess eyes of both these 

 kinds, but whether the respective powers thus attributed to them are 

 really possessed can scarcely be said to be yet proved. A subject of 

 much interest is hero open to observers out of doors, as well as to 

 skilful insect-anatomists. It would also be a point of great import- 

 ance to ascertain, by careful anatomy, the defects of structure 

 probably existing in some of the eyes of many spiders, notably 

 in thoso of the South European genus (Ecobius (Lucas) ; these 

 apparently defectivo eyes, instead of being convex and having 

 the look of perfect visual organs, have every appearance of 

 abortion or atrophy, being misshapen, flattened, and often like a 



