424 MR. E. S. RUSSELL OX THE RIGHTING 



the peculiav way to be described later, the complete turn might 

 take as long as 10 minutes. 



. The detailed records are as follows : — 



Sj}ecimen K: ca. 25 mm. 13/6/19. 



Method of turning. 



Time taken. 



40 sees. Turned on two adjacent arms. 

 35 „ 



24 „ 



30 „ Four arms attached, two outer gave up, turned on two. 



22 „ Three attached, one retracted tube-feet, turned on two adjacent arms. 

 5.5 ,, Turned on two. Interfered with by a shrimp. 



75 „ Turned mainlj' on one arm which bent back. Later on an adjacent 



arm rolled longitudinally and attaclied. 

 40 „ Turned on adjacent pair, but first tried to fix with arm opposite the 



pair on which it finally turned. 



Specimen B: ca. 30 mm. 13/6/19. 



20 sees. Turned on adjacent pair. 



30 ,, Four attached, outermost gave up, turned on two. 



20 ,, Three took part, turned on adjacent pair. 



30 „ Turned on adjacent pair. 



25 ., „ 

 30 „ 



25 ,, Three attached, one loosed hold, turned on adjacent two. 



32 „ Three most of the time, towards the end an outer ariTt gave up. 



30 „ Turned on two adjacent. 



32 „ 



Average time 2 7 '4 sees. — a clever and vigorous specimen. 



Specimen C : ca. 30 mm. 14/6/19. 



67 sees. First on three, then on adjacent pair. 



30 „ Turned on adjacent two. 



40 „ First on three, then on adjacent pair. 



35 „ 



42 „ 



25 „ Four attached slightly, turned on adjacent pair, 



25 ,, Three „ „ ,, 



23 „ Four „ „ „ 

 32 „ Three „ „ „ 

 28 „ Turned on adjacent pair. 



Average time 34*7 sees. 

 Sjjecimen D: ca. 25 mm. 14/6/19. 



30 sees. Turned on adjacent pair. 



35 „ Throe attached, turned on adjacent pair. 



27 ,. 



30 „ 



30 ., Four „ „ 



30 „ Tliree „ „ 



35 ,, Turned on adjacent pair, but second choice of pair. 



58 „ First four, then three, turned on adjacent pair. 



32 „ Turned on adjacent pair. 



25 „ 



Average time 33'2 sees. This specimen seemed slow at bringing 

 over fifth arm. 



