78 Wisconsin Academe/ of Sciences^ Arts, and Letters. 



SECTIONl, CALYPTOMERA. Sars. 

 Family 1. Sididae. 



GENUS 1. 



SiDA. Strauss, 1820. 



SiDA, Strauss, 1820. (Mem. sur les Daph. Mem. Nat. Hist., YI, 157.) 



Lieven, Liljeborg, Leydig, Baird, Schiidler, Sars, P. E. Miiller, Kurz. 

 SiDJEA, Fischer. 



SPECIES 1. 

 SiDA Crystallina. 0. F. Miiller. 



Daphne Crystallina, O. F. M. Zool. Dan. Prod., 2405. 

 For the long synonymy of this species, see P. E. Miiller. Danmarks Clado- 

 cera, p. 101-2. 



There appears to be no well marked difference between our 

 species and that of Europe. I wish to notice only one or two 

 points with regard to it. Glaus (Zeit. Wiss. Zool. Yol. XXVII) 

 asserts that he has seen a second maxilla in Sida. I have looked 

 for it carefully, and under most favorable circumstances, but have 

 failed to find it. I am inclined to question its existence. The 

 appendage has been seen by no other observer, not even Gr. O. 

 Sars. 



The projection on the inside of the basal joint of the legs 

 ("processus maxillaris," Sars), is triangular in shape, with ten 

 stout spines and a large number of setfe. This may be homolo- 

 gous to the "appendix interior" (P. E. Miiller) in Pollyphemus. 



Cambridge and Southampton, Mass.; Madison, Wis. Quite 

 plenty everywhere. 



GENUS 2. 

 Daphnella. Baird, 1850. 



Daphnella, Baird, Schodler, Sars, P. L. Miiller, Kurz. 

 DiAPHANOsoMA, Fischer. 



