200 



COELENTERATA. 



ex 



ot< 



PIG. 159. Sense organs and adjacent organs, I of Cestus veneris in side view (from the stomach 

 plane) x 100, II of Encharis 'iiivlticarnis from above x 120 (after Chun), a sense organ ; 

 <il bell ; / the four springs ; n l to ?i 8 the eight ciliated grooves with their cilia ci, and their 

 plate-like expansions at the base of the springs pi and pi ' ; k granules ; ot otoliths ; oti otoliths 

 in process of formation ; p edge of polar plate ; ^/middle part of polar plate (polar field) ; 

 mu (in II) muscular fibres running beneath the ciliated grooves ; w circular muscular fibres ; 

 mit (in I) longitudinal muscles of the funnel-vessels; i< funnel-vessel; gg branching of a 

 funnel-vessel into the ampullae ; ex aboral excretion pores. 



