HARDWICKE'S SCIENCE-GOSSIP. 



Fig. 54. — a, Cercwionas acuminata; b, Anisonema sulcata; c, Uvella group; d, ditto, stained with iodine ; e, ditto, higher 

 power ; f x Antkophysa Miilleri; g, ditto, higher power ; /:, ditto, single zooid ; j, Peridinium cincintn, low power. 



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^:-V. 



Fig. 55. — Paramecium aurelia. 1, front view ; 2, side view ; 3, contractile space ; a, diastole ; b, systole, showing two canals ; 

 4, posterior end, showing posterior cilia ; ect, ectosarc ; cu, external layer ; ci, ciliary layer ; t, deepest layer ; ci and t make 

 up the cortical layer. In all the figures: c, cilia; d t cilia of gullet; ect, ectosarc; end, endosarc; c.v, contractile spaces; 

 jf.v, food vacuole ; m, mouth ; g, oesophagus or gullet ; g J , dilation of gullet ; a, anterior, and p, posterior end. The arrows 

 in j represent the direction of the current. 



