TY  - BOOK
AU  - Clarkson, E.N.K
TI  - Invertebrate palaeontology and evolution
SN  - 9788126533084 
PY  - 1998///
CY  - New Delhi
PB  - Wiley-Blackwell,     
KW  -  Class hexactinellida
KW  -  Mazon greek fauna
KW  -  Morphology and evolution
KW  -  Prokaryotes and eukaryotes
KW  - Fossil record
N1  - Systematic index 435-442p.; General index 443-452p.; Reprint  2012
ER  -