JOURNAL OF ENTOMOLOGY AND ZOOLOGY 203 



are used as feelers, and one or several of them may be extended 

 or elevated. In a dish of water the animals cannot walk very well, 

 but partly walk and partly swim in some cases. The head end is 

 not always the part which begins or determines the direction of the 

 slow phalangid-like movements. When several specimens are left 

 In a dish it is not long before all are in a ball, holding to each other 

 by means of their sharp claws. 



If two specimens are near they are soon drawn together. This 

 clinging instinct is a very important one for the animals and is well 

 developed. Those with long legs if kept separated fold at the 

 third joint so that they look like little stools; they may fold either 

 with the legs on the dorsal or ventral side. Some individuals seem 

 to prefer one side, others fold the legs on either side equally readily. 

 In some, especially those with eggs, the legs are folded in this 

 way over the eggs. In some the legs may be folded closer to the 

 body and the whole animal is like a little ball. In such a form 

 the legs may be made to extend themselves if the animal is lifted 

 and dropped a little distance. This will work every time with 

 some but with a few, such as A. spinosissima, the legs become more 

 tightly drawn to the body and the animal may even remain as 

 though dead during several changes of its position. Many, if not 

 most of the Pycnogonids can right themselves if turned over, but 

 most of them rest as well on the back as on the ventral side. 

 Righting movements are either by action of all legs at once from 

 a stool position, or movements of only a few legs. P. stearnsi 

 Is somewhat an exception to many of the activities of the others 

 mentioned. Its legs do not fold up much, they walk very little, do 

 not swim and are In every way less active than the other species. 

 They do cling to each other and if there are a number in a dish 

 together they soon form a single ball. They cling to each other 

 or to other objects, but from the shape of their legs and bodies they 

 cannot hold very fast to anything. 



The following Is a list of the specimens obtained during the sum- 

 mer of 1915. At another time some further observations relating 

 to the life history of at least one species may be given. 



