6 TULLBERG, NEOMENIA. 



dinal direction. A large number of radial, generally finer, 

 miiscular fibres passes across through all these layers (22 f). 



A number of fiue branching canals also extend through 

 the connective tissue (22 i). They are filled with roun- 

 ded cells (28), and can hardly be anything else than blood 

 canals. Whence these have their origin, I cannot with 

 certainty say, but they probably communicate with the larger 

 canal (6 n), that runs along the under wall of the muscu- 

 lar coat, and therefore also with the cavity surrounding the 

 inferior part of the rectura (6 o). Under, and parallel to 

 that canal, the integument forms a rather deep furrow (6 k), 

 beginning immediately behind the mouth, with a vertically 

 directed passage, which dilates somewhat inwards, but seems to 

 terminate blindly (6 1). Backward the furrow is continued 

 to the anus, and its bottom exhibits a number of longitudinal 

 folds. of which the raiddle one is the largest (6 m). When the 

 animal is contracted, the furrow is scarcely visible from without 

 (2 c), but becomes gradually distinct as it extends itself (4 c). 



The ncrves in the nniscular coat (22 g) are at first sight 

 like the muscular fibres, but are easily distinguished from 

 theni by their ramifications. They in fact send out a number 

 of larger or smaller branches, which penetrate the connective 

 tissue, and sometimes interlace with each other so as to form 

 a net-work. With the nerves a number of cells containing 

 pigment (15, 16, 22 h), are counected. They are often pro- 

 vided with several ramifications, and sometimes form a sort of 

 dilatation of the nerve itself. The upper esophageal ganglion 

 (11) is of an elliptic form, and from it proceed a large num-- 

 ber of nerves, at least six on each side. I have not been 

 able to follow these very far, and cannot thereibre describe 

 their course, but it is evident that a pair of thcm are united 

 with the inferior ganglia (12). These are of an oblong trian- 

 gulär form and are united by a very slender commissure.' 

 From these ganglia, behind, proceed the two abdominal nerves, 

 sending out branches on both sides (13, 14). Whether any 

 of these branches pass över from the one nerve-trunk to the 

 other, I cannot with certainty say, though I think I could 

 sometimes discern such to be the case. The two ventral nerves 

 go, as has been stated above, one on each side of the canal 

 that passes through the mferior wall of the body, and between 

 them and this canal is a peculiar tissue consisting of rounded 



