4L>4 



MliI;l>TIC VARIATION. 



[PART i. 



I. (JtELEXTERATA. 



*63u. Sarsia mirabilis ' : normally four radial canals, &c. (Fig. I'll. 

 1 and 111). Out of many hundreds of N.American specimens 

 In',, were t-Mind with six radial canals, six ocelli, and six tentacles, 



! 



FIG. 127. Surain miniliili.*. I and III, the normal form, with four radii, from 

 mill from uliove. II and IV, au abnormal form with .six radii, from below 

 and from ubuvu respectively. (From AGASSIZ.) 



y arranged (Fig. 127, II and IV). These specimens 

 were \' lar-vr ahsuliiir si/.- than the normals. AGASSIZ, L., Mem. 

 Amer. Ac. Sci., iv. \>. -Jls, PL v. rig. 5. 



i.- the medusa of tlie Gymiioblastic Hydroid Syncoryne. 



