CALIGOIDEA. 



1339 



outward, along the margin of the joint; the second are inserted near 

 the extremity, and pass upward and a little outward. The following 

 three pairs are attached near the middle, and pass outward and a 

 little upward ; the remaining two pairs are inserted near the opening 

 to the intestine, and have the same direction as the last. The muscles 

 have often been seen in action, in expelling the feces ; the two sides 

 move either simultaneously or alternately, according to the necessity 

 of the case, in the act of expulsion. 



The intestinal fluids are usually light yellow; occasionally they 

 present a deep wine-yellow colour, especially below the sternum of 

 the second pair of natatories. Solid vermiform masses, of a brown 

 colour, are often seen floating in the fluids. 



Along the alimentary canal there are several small glands, which 

 have a granulous structure, and are in general but slightly coloured. 

 Their particular functions are mostly conjectural. 



The central projection between g, g, fig. p, is the termination of a 

 gland of considerable size, which is situated beneath the posterior 

 extremity of the buccal mass, and is usually detached with it, on dis- 

 section. It is represented in fig. 1 n, where its size corresponds to the 

 mouth in fig. 1 h. When separated from the mouth, a duct may be 

 seen on each side, entering the mouth near the oesophagus. Anterior 

 to the mouth, another collection of glands is observed (fig. 1 o, see also 

 fig. a), which also communicate with the mouth by ducts. These are 

 probably salivary glands. 



The oesophagus, especially near its base, is furnished with a large 

 number of exceedingly minute, transparent globules, supported on 

 short pedicels (fig. I) . These appear to be glands, and their pedicels 

 ducts. 



Below the stomach, in the thorax, there are four pairs of glands. 

 One pair, of nearly spherical form, are situated at the lower extremity 

 of the stomach (c, fig. h) . The second pair, larger, of an oblong form 

 (d), occur just below the sternum of the first pair of natatories, and 

 are connected with the intestine by a duct under the following 

 sternum. The third and fourth pairs (e, f) are situated on the en- 

 largement of the intestine, below the sternum of the second pair of 

 natatories. The functions of a liver are probably performed by some 

 or all of these glands. 



Two other pairs of small glands are situated in the abdomen, which 

 we presume to be connected with the intestine ; we have not, however, 



