TY  - BOOK
AU  - Clark, R. B. 
TI  - Dynamics in metazoan evolution : the origin of the coelom and segments
U1  - 593 CLA 
PY  - 1964///.
CY  - Oxford : 
PB  - Clarendon Press, 
KW  - Animal locomotion
KW  - Evolution
KW  - Invertebrates
ER  -