222 CTENOPIIOR.E. Part II. 



order to point in a general \\i\y perpendicularly to the curvature of the periphery 

 of the body, and become 1)y degrees foret;hortened, until they point directly at 

 the eye from the bottom of the socket. In a profile yiew of the sockets {Fi(/. 

 23), the cells at the last-mentioned place (ni^) trend in lines at right angles to 

 the line of yision, and therefore directly towanl the oral area ; yhilst, now, the 

 cells in the equatorial plane point directly at the eye. 



The merging of this into the radial s}stem at this point, we haye already 

 indicated ; l)ut the precise line of juncture of the two may be better and more 

 clearly described now that the boundaries of the former haye been distinctly traced. 

 Where the oral plane strikes the inner face {Fir/. 21 A, )i*) of the opposite peri- 

 pheric band, the cells of the two systems in (piestion trend so nearly in tlie same 

 direction as to make it yery difficult to distinguish them apart ; and, in truth, it 

 is only when seen from the horizontal end that the oral curye (jr) of the cells of 

 the lateral system furnishes the means of eliminating them from those of the radial 

 system. This apparent confusion of the peripheric borders of the two sj'stems 

 obtains all ak)ng the median line of the pei-ipheric band just mentioned to its 

 termination, and then along the borders of the oral system (m^). The cells {j>^) 

 cross each other at wider and wider angles, until, hall-way between the oral and 

 tentacidar planes, they mutually traverse one another at right angles, and then 

 again their trend grows more and more nearly parallel, till they run in the same 

 direction side by side at the tentacular plane. At the latter point the parallelism 

 is more perfect, and extends deeper into the body than along the median line of 

 the peripheric band ; and, in a profde view of the sockets (/), that part of the 

 radial system (?«") which p)asses from the tentacular ajiparatus to the yertical chy- 

 miferous tubes (r r), seems to be one and the same with the lateral system (?«'"), 

 which radiates from the base of these sockets. In passing to the several bands (A, 

 B, C, D, E, r, G, H,) of the peripheric system, and to the chymiferous tubes (P to P), 

 the cells of the lateral system preserve the same curve, both horizontally and 

 vertically, as along the lu'pothenusal flice. As we lune already remarked, these 

 cells trend very nearly parallel with those of the radial sj'stem, where they meet 

 along the median line of the peripheric bands which are in the oral plane, and, 

 as we pass around the periphery toward the tentacular plane, we here also find 

 the two, abutting against the several bands (A to H) with a like trend; but it 

 is only at the periphery that tins parallelism obtains, whilst towards the axis of 

 the body the cells cross at all angles between the most acute and a right angle, 

 according to their j'osition : thus those cells which radiate to the j^eriphei'ic inter- 

 amljulacral band (A and E) in the oral plane, cross the radial cells which i)roceed 

 from about the corners {Fi(/. 21 «'), from the outer third, and from the median 

 third of the digestive cavity, severally at a very acute angle, at an angle of 



