108 



oneself that it is perfectly unattached. And in connexion with this 

 evidence I may remark, that the tissues of the Brachiopods in general 

 are anything but delicate ; it would be quite impossible for instance 

 to break away the end of the intestine of Lingula from its attach- 

 ments without considerable violence. 



Thirdly. If the extremity of the intestine, either in Rhynchonella 



Fig. 1. 



Fig. 1. Rhynchonella psittacea, viewed in profile; the lobes of the mantle and 

 the pedicle being omitted. 



Fig. 2. The same viewed from behind, the pedicle having been cut away. The 

 left half of the body and the Jiver are omitted. 



a. mouth ; b. oesophagus ; c. stomach and liver ; d. intestine ; e. imperforate 

 rectum ; f. mesentery ; g. gastro-parietal bands ; h. ilio-parietal bands ; i. superior 

 ' heart ' ; k. inferior ' heart ' ; /. genital bands ; m. openings of pallial sinuses ; 

 H. pyriform vesicle ; o. sac at the base of the arm ; p. ganglion ; q. adductors. 



