676 



MR. J. GRAHAM KERR OK TlUi 



[June 18, 



series of tentacles, separated by a peculiar lamellated organ 

 which has been supposed to be sensory. This lobe is called 

 the " inner inferior lobe '"' by Lankester. For its innervation 

 there is figured by Owen, and copied by Gegenbaur and others, a 

 small distinct ganglion on each side. In the specimens which I 

 have dissected, however, the conditions are as follows : — Upon 

 each side, somewhat external to the root of the funnel-nerve, there 

 arises from the anterior sub-oesophageal nerve-cord a rather 

 thinner nerve-trunk, which passes into the basal part of the lobe 

 mentioned. This bends towards the middle line, pursues a curved 

 course in the substance of the lobe, and meets \^"ith its fellow 

 of the opposite side. The two together form in fact not two 

 separate ganglia, but a continuous cord. The median most 

 strongly curved part of this cord gives off about 24 slender nerve- 

 filaments, which radiate forwards to the lamellae of the lamellated 

 organ. The more lateral parts of the cord, on the other hand, give 

 off a stout unbranched nerve to each of the tentacles of the lobe. 

 These nerves, coursing as they do through the fibro-muscular 

 substance of the lobe, are very hard to trace out in their entirety. 



VI. The Post-anal PapillcB and Net'ves. 



A short distance behind the anus is a peculiar flap-like structure, 

 arising from the body-wall and bearing four papillfe. It varies 



Fig. 5. 



p.a.p 



Post-anal papilla with glands in the female. 



a, anus ; p.a.p, post-anal papilla ; gi. openings of glands ; n.ff, nidamental gland ; 

 ft.i-.v, pericardio -visceral aperture : ncpk^ ipening of kidney chamber. 



