50 



K. MITSUKUIII : STUDIER ON 



mittleren Stabe diirclisetzt." A careful study of these ellipsoids 

 obliges me to differ from Selexka in the details. A detailed 

 study under a higher power shows that they are not as regular 

 as represented in Selenka's figs. 15 and 1'/. If, with a dull 

 point of needle, pressure is l)rought to bear on the cover-glass 

 not long after a preparation of the ellipsoids is made in canada- 

 balsam, the ellipsoids begin to roll about on their axes, and 

 one is then able to get a glimpse of all their sides. ïextfig. 



Textfig. lO. 



Mi'dleria rnandata: a — Common ami regular type of ellipsoids; ?*— Irregular type; c — Side 

 view o£ an ellipsoid ; (Z— Side view of another ellipsoid with a double row of holes in the 

 middle part; e — (j — Simple types; h 1 — 5— Different views of an ellipsoid seen while rotating 

 about its longitudinal axis ; k — Transverse section of an ellipsoid : 1 — central rotl, 2 —paired 

 rods at each edge, 3 — rods running in the middle of the two broad surfaces ; I — n — Tables. 

 {((—1<\ on. X 300 ; l—n, x 200). 



// 1 — 5 show sketches of an ellipsoid in various aspects, made 

 as it rolled about. In fig. h 1 we observe one side. The arches 

 on that side (as delineated by heavy lines) are irregular. As it 

 rolls from left to right, it begins to show its left edge (fig. h 2), 



