BTHANG TILL K. SV. TET.-AKAD. HaXDL. BAND. 3. N:0 13. 7 



cells, each containing one strongly refracting granule. Xot 

 only tlie ventral uerve-trunks, biit also the two lateral nerves 

 (7 y) appear to lie in a sort of canal, which was particularly 

 distinet round the side-nerves in tlie extended specimen. 

 These canals, wliich are much smaller than the great ventral 

 canal (6 n, 7 n), are probably also a sort of bloodvessels. The 

 two lateral nerves undoubtedly originate in the supra-eso- 

 phageal ganglion. The ganglia are covered with a raembrane 

 consisting of connective tissue, within which is a mäss of irre- 

 gular cells, with ramifications. Xo ganglionic enlargements 

 appear on the great longitudinal nerve-trunks. 



The alimentary canal is composed of three principal parts : 

 .the pharynx, the stomach, and the rectum. The pharynx 

 again consists of two parts, of which the posterior (6 c) forms 

 an annular fold, which contracts (9 c, 10 c) when the anterior 

 part is protruded, and when that is contracted, dilates and 

 surrounds it like a crown (6 c, 8 c). The anterior part (6 b, 9 b) 

 dilates when protruded, and thus covers the surrounding por- 

 tion of the skin (10 b). The stomach commences immedia- 

 tely behind the pharynx. It is peculiarly broad, occupying 

 more than two-thirds of the body's breadth, and more than 

 half its length. From the side-walls of this large cavity pro- 

 ject a great niimber of closely set transverse lamellse (6 e, 

 7 e), giving it a most peculiar appearance. The substance 

 of these lamella? is composed of a membrane of connective 

 tissue which for the greater part of its length is fastened to 

 the wall of the muscular coat and, like it, traversed by muscu- 

 lar threads. The upper extremity of the lamellge is united 

 with the membrane that divides the stomach from the 

 ovary (7 v). The whole stomach, together with its lamellae, 

 is covered with a thin layer of a brownish soft tis.sue, in which 

 I could not discover any distinet cells. The rectum (6 f) is 

 rather narrow in the middle, but considerablv dilated just be- 

 fore the anus. This more spacious portion is provided with a 

 nuraber of laraellfe, of considerably smaller dimensions, how- 

 ever, than those in the stomach, and placed in a longitudinal 

 direction (6 h). 



The ovary (6 u) is bounded on its under side by the 

 walls of the stomach, and on its upper side by the mixscular 

 coat. The whole organ is divided bv transversal membranes 

 (G w) of connective tissue into a number of compartments 



