GENERAL DIRECTIONS. 



As will be noticed, the preceding pages are almost wholly 

 devoted to means and methods of collecting, and identify- 

 ing unknown Ccelenterata and Echinodermata when they 

 are found. It likewise seems appropriate in an article of 

 this nature to aid the collector by approaching the subject 

 from a somewhat different side. Where shall one go, and 

 how collect certain of these animals the systematic posi- 

 tion and name of which are known? Information as to the 

 locality where any desirable genus of these groups can be 

 found without failure, and hints as to special methods to 

 be followed in procuring it may also with advantage form 

 a part of this work. Teachers desiring for instance a 

 supply of star-fishes or sea-urchins for class instruction 

 might regard it a help if some information be imparted in 

 this direction. Hints as to how to procure certain typi- 

 cal larval forms may also not he out of place here. 



I have therefore chosen a few available types from each 

 group, and endeavored to offer suggestions as to modes 

 of collecting and places to be visited, which rarely fail to 

 reward the collector. 



Some of the Ccelenterata and Echinodermata are grega- 

 rious ; others live apai t more or less isolated. The time 

 and place of the appearance of nomadic animals are not con- 

 stant, and no rule can be laid down which will be sure to 

 guide one in the collecting of such genera. Moreover, the 

 home of many may vary in different months, and even 



(74) 



