Part first. 



Fig. 64. Thalassocbetys corticata (Caouana). 

 Vo nat. size. p. 90. 



In front of tank 10 is a little open trough. Lying on or 

 half buried in the shingle is an Electric Ray (Torpedo , fig. 66) 

 from which shocks may be taken. The fingers should be placed 

 under the broad part of the body , the thumb above , and the 

 animal squeezed or otherwise ill-treated. Frequently among the 

 shingle are small white pointed objects , about two inches long, 

 looking not unlike split sardines. These are Lancelots (Amphioxm, 

 fig- 66), the lowest Vertebrate. 



