STRUCTURE, ETC., OF CEKATA OF NUDIBRANCHS. 63 



Fig. 37. — A neiglibouriuf^ section to the preceding one, showing the con- 

 necting tube {c. t.) between tlie cnidophorous sac and the hepatic ctecuui, cut 

 open in the greater part of its length, being only crossed by a few of the 

 fibres of the sphincter muscle at its lower end. The other parts are before. S. \. 



Fig. 38. — Group of cnida of Eolis (Facelina) drummondi in various 

 positions ; the upper four are unexploded, the lower one has the thread everted. 



Z- tV- 



Fig. 39. — Cnida of Eolis (Facelina) drummondi more highly mag- 

 nified (x about 13G0), showing the arrangement of the spines on the basal 

 part of the thread. Z. -^-^, oc. 4, tube. 



Fig. 40. — One of the large cells or cnidocysts {ec'.) from the cnidopliorous 

 sac of Eolis (Galvina) picta, in which the cnida are formed, showing the 

 nucleus and nucleolus and the numerous elongated cnida embedded in the 

 protoplasm. Two younger cells {ec".) are seen at the base. Z. ■^^. 



