1914] Liftlf: Ocelli of Pol, jordiis 319 



cells and the processes of the other cells of the eye was found, 

 though such a connection may exist. Eimer (1878) mentions such 

 a connection though he does not demonstrate its presence. 



As to the connection between the nerve cells of the eye and 

 those of the nerve ring nothing definite could be determined. 

 Among the diversified cells of the tentacle were found (in the 

 cross-section through the tentacle already referred to (pi. 14, 

 figure 7) from eight to ten small spindle-shaped cells with their 

 drawn-out ends overlapping, so that a semblance of a cord or 

 chain of cells was found. This was found to be three cells deep. 

 These cells have every appearance of being nerve cells, and if so, 

 since they are found only on a plane through the center of the 

 eye, the fact can be explained only on the basis of their being a 

 branch of some nerve, perhaps of the nerve ring and connecting- 

 it with the .sensory part of the eye. 



That a nervous connection exists along the margin of the bell 

 is shown bj^ Romanes (1898) in his experiments on jellj'-fish. He 

 found that, with the single exception of Sarsia, the removal of the 

 extreme periphery caiLses permanent paralysis of the locomotor 

 system. lie also foiind that a nervous connection unites the ten- 

 tacles with one another and also with the manubrium, since all 

 physiological connections were destroyed by radial cuts between 

 the tentacles, while if no cuts were made the co-ordination between 

 two ad.jacent tentacles was apparent. 



When examined under a high power the pigmentation of the 

 eye-spot shows many unique characteristics. The difference in 

 distribution of the two kinds, red and brown, has already been 

 mentioned. The structure of these two seems entirely unlike. The 

 brown pigment consists of round, fine-grained, uniform-sized 

 granules occupying definite positions. On the other hand the red 

 is easily distinguishable by its coarser-grained, irregular, uneven- 

 sized granules and its wide range of distribution. In the isolated 

 pigment cells (pi. 15, fig. 11) this difference is clearly shown 

 (see also pi. 14, fig. 4). The large ball-like mass of the coarser 

 granules found among the smaller grains of both kinds is char- 

 acteristic of the red pigment. This peculiar lumping together 

 of the separate granules is never found in any but the red, though 

 some of these red ma.sses found in the pigment cells may be cov- 



