E. W. BERGER ON THE CUBOMEDUS^E. 67 



I shall not endeavor to discuss the subject further, but shall 

 append the literature on the subject that has come to my notice. 

 (See Literature). Some of these observers ascribe a nervous function 

 to these centrad continuations. I am inclined to believe that they 

 represent the primitive fibrils of Apathy, whether the cilia or flagella 

 are motile or sensory. I should mention, however, that Apathy has 

 traced the " Primitivfibrillen " to be continuous with cilia, and also 

 traces them into the sensory rods of the sensory cells in the sense 

 organs of leeches. Eimer also describes cilia as continued centrad. 



The Network Cells and the Multipolar Ganglion Cells. Conant is 

 the first to accurately describe the true structure of the network 

 cells (Fig. 13) that fill the upper part of the club between the 

 proximal complex eye and the attachment of the peduncle. I cannot 

 add anything to Conant's description. As their name implies, they 

 are filled with a coarse network-like structure with a central nucleus 

 and nucleolus. Schewiakoff erroneously described them as ganglion 

 cells and Glaus as supporting cells. I have sometimes thought that 

 they are not made up of a network, but of a vesicular structure ; 

 i. e. the network we see is really produced by the sections of 

 planes that intersect to form little polyhedral cavities. I could not, 

 however, satisfy myself on this point. I further saw similar but 

 smaller cells, with a finer network, disposed in small groups laterally 

 and distally from the attachment of the peduncle to the club. 



What the function of these network cells is can only be guessed. 

 In size and shape they somewhat resemble some of the cells found 

 in luminous organs. Conant, however, nowhere mentions that 

 Charybdea is luminous. 



Lateral to the larger group of network cells lie two groups of 

 large multipolar ganglion cells (a group on each side). Claus 

 describes these cells, but Schewiakoff does not specially note them, 

 and evidently considered them a part of the network cells, which 

 he erroneously described as ganglion cells. 



The Nerve Tissue. I cannot add anything new on this. It 

 consists of fine fibers and ganglion cells, quite as described by Claus. 

 Schewiakoff, and Conant, and fills the club between the ampulla 

 and the epithelium, except the spaces occupied by the eyes, lithocyst, 

 and network cells. It is likewise present under the ectoderm of the 



