98 ADDENDA. 



lit the dead animal, steals softly near, and then with a sudden snap of 

 the jaws swallows it. 



2Qt/i. This animal, No. 1, has become exceedingly tame. It readily 

 approaches the side of its glass ; and, yesterday, stretched up its head to 

 take morsels of mussel from the end of a feather. 



It is fortunate to find this substance acceptable, from the facility of 

 obtaining it. 



2lst. The larger animal feeds from my hand, it is so tame. 



23d. It ate voraciously of soft mussel to-day. The small one, No. 3, 

 likewise ate another portion of it. 



I took one yesterday, of the same species, in that pond or marsh 

 before mentioned, about an inch long, which may be substituted as No. 2, 

 for the lost one. 



The smallest, No. 3, is under an inch in length. This smallest ani- 

 mal pounces on its prey like the other. The large one seems quite insen- 

 sible of food if lower than the head. If higher, it advances very softly 

 one foot after another ; but, until almost in contact, never attempts to 

 snap, when the food is seized in a moment. 



October 4//i. It feeds readily on the mussel, and is extremely vora- 

 cious, much more so than the two small ones. I remark it devours a 

 great quantity at once ; and never attempts to seize anything unless it be 

 above its head. If a portion falls to the bottom of the vessel it seems to 

 remain untouched. 



25M. All three survive. 



November 13M. The smallest died yesterday. 



The other small one has never ate ; but I could observe it swims a* 

 freely and buoyant with water as a minnow. It was delineated yesterday. 



The largest is quite well : feeds readily, and is very tame always 

 coming to the side of the vessel on my approach. 



20//t. It eats voraciously, and comes very slily to snap at the food. 



The eye is beautiful, it is quite circular. This creature was deline- 

 ated yesterday. 



22</. The feet of the small une are developed ; some of the branchial 

 apparatus remains. To-day it snaps at fragments of mussel. 



