422 pisces. 



this form to the rectum or anus. These small intestines contained a 

 vast number of claws, shells, &e. of crabs. 



The liver is small, long, and lies alongside of the lower part of the 

 oesophagus. The gall-bladder is not attached to the liver as in the 

 fowl, amphibia, &c. ; its duct passes into the duodenum just as it bends 

 down. 



I could see nothing like testicle or ovarium. The whole viscera were 

 attached, anteriorly, to the parietes of the abdomen, by a membrane like 

 the mediastinum in the thorax; and, when slit up longitudinally, it 

 looked like a double mesentery. This is more like the snake than the 

 eel, as if it was approaching the snake. 



[Order Dermopteri.] 



The LamperEel [Petromyzon fluviatilis,a,n& Petr. mwinus, Tjmn.~]. 



The mouth is longitudinal : when fully opened, it becomes round and 

 makes a kind of cup, studded all over the inside with teeth : the lips 

 have small processes placed all round. The tongue is a projecting body 

 at the bottom of the mouth, and of a particular shape, having a great 

 many teeth upon it for holding 1 . The eyes are placed on the sides of 

 the head, and pretty far back. The nose is placed on the top of the 

 head as far back as the eyes, having but one nostril which opens 

 forwards. The fins on the back are placed near the tail and on the 

 tail. 



The oesophagus passes down through the chest and opens into the 

 stomach : as it passes down it is perforated laterally on each side by 

 seven large openings, so that it may be called both oesophagus and 

 trachea 2 . The stomach passes in the same direction with the oeso- 

 phagus, or in the direction of the abdomen, and appears to be only an 

 enlargement of the oesophagus. The stomach is not attached to any 

 thing excepting the liver by means of the vena portarum, which at this 

 part adheres closely to both, as it were running between and uniting 

 them together. The stomach contracts, and may be said to terminate 

 in the gut. 



The gut passes in a straight line from the stomach to the anus ; so 

 that the oesophagus, stomach, and intestines form one straight tube 

 from the mouth to the anus. The intestine is not attached to any thing 

 through its whole course ; that is, it has no mesentery. Near the anus 

 there are the arteries passing to the gut, and there are communications 

 between the vena cava and the veins of the gut or vena portarum. The 



1 [Hunt. Preps. Pbys. Series, Nos. 396, Osteol. Series, No. 35.] 



2 [lb. Nos. 1022, 1023.] 



