Polyorchis penicillata 



Fig. 3. Portion of rim of bell showing ocelli and tentacles of differ- 

 ent sizes. Tentacles in a contracted state. X 66. 



Fig. 4. Median section of ocellus showing the finer structure of the 

 organ. X 666. 



Fig. 5. Radial section through rim of bell showing relation of ocellus 

 and tentacle. X 100. 



Fig. 6. Section in radial plane turough rim of the bell cutting through 

 the margin of an ocellus. X 666. 



Fig. 7. Cross section of tentacle through an ocellus. X 367. 



ABBREVIATIONS 



has. b. — basal bulb of tentacle. 



has. mem. — basement membrane. 



hip. n. c. — bipolar nerve cell. 



fir. pig. — brown pigment grains. 



fir. pig. c. — cell with coarse brown pigment and fine red pigment. 



cire. can. — circular canal. 



circ. mus. fib. — circular muscle fiber. 



ent. — entoderm. 



ep. c. — pigmented epithelial cell with small amount of red pigment. 



gang. c. — ganglion cell with branches. 



i. ect. — ectoderm lining bell. 



Is. — lens. 



I. mus. fib. — longitudinal muscle fiber. 



mes. — mesogloea. 



mus. fib. — muscle fiber. 



n. c. — nerve cell 



nem. — nematocyst. 



n.r.l. — inner velar nerve ring. 



n. r. 2. — outer velar nerve ring. 



oc. — ocellus. 



o. ect. — outer ectoderm of bell. 



pig. c. — pigment cell. 



r. can. — ring canal. 



T. pig. — red pigment grains. 



pig. c. — pigment cell. 



r. pig. m. — red pigment mass. 



sens. c. — sense cell. 



sup. conn. tis. — supporting connective tissue. 



tetit. — tentacle. 



tent. can. — canal of tentacle. 



vel.- — velum. 



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