225 g* This came from a sudden increase of pulling as shown by 

 the curve and resulted in the arm breaking off where it was tied* 

 The animal had thus pulled steadily at a tension of from 60 to 

 225 g for a period of over 33 hours* Another specimen 18 cm in 

 diameter pulled 300 g when it was released for fear of breaking 

 the apparatus* 



Correlated with the fleet that Asterina. never attaches as 

 tightly as does Piaster is the faot that it never pulls as hard* 

 A 10 oca Aaterina, registered pulls of 60, 77, 69, and 46 g* in 

 four successive trials* A smaller (8cm) but more active As te ring 

 pulled 90g* 2he peak of the curve would be reached after a 

 gradual ascent of about 20 minutes* de decline would last from 

 one to two hours* Both the decline in the height of the curve 

 and the fact that the pull did not last long, comparatively, are 

 perhaps, evidences of fatigue* 



To test the role of the attaching reflex in this response, the 

 animal was put on sand and set to pulling in the same way* the 

 best pull it could record was ?i g* A 40 g* (weight in water) 

 Syracuse dish was laid on top of the animal* This increased its 

 pulling ability to 15 g. The adding of weight to Asterina or 

 Pisaatar when pulling on a solid substrate made no appreciable 

 difference in theAr puHling ability* 



The case of Pyonopaj&ia # is different as we shall see later. 



Soheinmetz ^1896) states that with respect to food taking, 

 starfish may be divided into two types, those that swallow their 

 food whole such as Astro pec ten and those that pull open the 

 bivalves on which they feed and digest them by extruding their 

 stomach and applying it to the soft parts of the mollusc* (Asterias) 

 Although fyonopodia is grouped in the loroipulate. with AsteriaS. 

 and has tube feet, inoontradlstino tion to those of Astro pec ten. 

 capable of tight attachment, it swallows its footjwnole, ejecting 

 the (indigested parts* Correlated perhaps with the fact that the 

 animal does not pull open its bivavle prey* as do most of the 

 other ?orcipulata, is the faot that under other conditions as well, 

 the tube feet, though the;, can tightly attach, do not ordinarily 

 do so when pulling, and consequently the animal can not pull very 

 hard* 



