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Comparative survivorship and fecundity of m i c t i c and a m i c t i c female r o t i f e r s . P h y s i o l . Zool . 4 3 , 206-212 . P E N G E L L E Y , E . T . & F I S H E R , K . C . ( 1 9 6 3 ) . The effect of t e m p e r a t u r e and p h o t o p e r i o d on the yearly h i b e r n a t i n g b e h a v i o r of c a p t i v e g o l d e n - m a n t l e d ground s q u i r rels {Citellus lateralis tescorum) . C a n a d . J. Z o o l . 4 1 , 1 1 0 3 - 1 1 2 0 . T. H. (1966). A " c i r c a n n i a n " r h y t h m in h i b e r n a t i n g species of the genus Citellus with o b s e r v a t i o n s on their p h y s i o l o g i c a l evolution.

8. A n n u a l r h y t h m i c i t y in a h i g h l y o r g a n i z e d species like the cave crayfish and one with an u n s p e c i a l i z e d nerve n e t rather than a c o m p l e x central n e r v o u s s y s t e m , C . flexuosa^ argues for the u n i v e r s a l i t y of c i r c a n n u a l rhythms. 49 M A R Y ANNE BROCK REFERENCES Circadian vocabulary. A S C H O F F , J. ( 1 9 6 5 ) . C i r c a d i a n C l o c k s . North Holland P u b l . C o . , A m s t e r d a m , p p . x-xix. , A S S E N M A C H E R , I.

Average Time for Hydranth Replacement; Sites of Regression 10 u 9. None Replaced None Replaced 24° C. 1 days None Replaced 10 C 17° C 24° C Fig. 5 days u Mean Hydranth Longevity C. 17° C C o l o n i e s o f C. 9 - days c o u l d r e a c h t h i s m i n i m a l size d u r i n g seasons o f sparse g r o w t h . T h i s c o l o n y had been c u l t u r e d at 2 4 C a n d e v e n t u a l l y d i e d in F e b r u a r y 1 9 7 1 . The cellular c o m p o n e n t s have b e e n l o s t f r o m t h e d i s t a l s e g m e n t s o f m a n y u p r i g h t s t e m s , l e a v i n g o n l y t h e empty perisarc.

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