THE SUBPHYLUM CALCIPHORDATA (JEFFERIES 1967) PRIMITIVE FOSSIL CHORDATES WITH ECHINODERM AFFINITIES.JEFFERIES RPS.1968; BULL. BRIT. MUS., NAT. HIST., GEOL.; GBR; 1968, VOL. 16, NUM. 0006, P. 241 A 339Miscellaneous

THE ORDOVICIAN FOSSIL LAGYNOCYSTIS PYRAMIDALIS (BARRANDE) AND THE ANCESTRY OF AMPHIOXUSJEFFERIES RPS.1973; PHILOS. TRANS. R. SOC. LONDON, B; G.B. ; 1973, VOL. 265, NUM. 0871, P. 409 A 469Serial Issue

SOME COMMENTS ON THE ORIGIN OF CHORDATES.JEFFERIES RPS.1971; J. PALEONTOL.; USA; 1971, VOL. 45, NUM. 0005, P. 910 A 912Miscellaneous

CERATOCYSTIS PERNERI JAEKEL-A MIDDLE CAMBRIAN CHORDATE WITH ECHINODERM AFFINITIES.JEFFERIES RPS.1969; PALAEONTOLOGY; GBR; 1969(9), VOL. 12, NUM. 003 , P. 494 A 535Miscellaneous

SOME FOSSILS CHORDATES WITH ECHINODERM AFFINITIES.JEFFERIES RPS.1967; SYMP.ZOOL.SOC.-LONDON.; 1967, NUM. 0020, P. 163 A 208Miscellaneous

THE ENGLISH SILURIAN FOSSIL PLACOCYSTITES FORBESIANUS AND THE ANCESTRY OF THE VERTEBRATES.JEFFERIES RPS; LEWIS DN.1978; PHILOS. TRANS. R. SOC. LONDON; G.B.; DA. 1978; VOL. 282; NO 990; PP. 205-323; H.T. 5; BIBL. 4 P.; 40 ILL.Serial Issue

A NEW CALCICHORDATE FROM THE ORDOVICIAN OF BOHEMIA AND ITS ANATOMY, ADAPTATIONS AND RELATIONSHIPSJEFFERIES RPS; PROKOP RJ.1972; BIOL. J. LINN. SOC.; G.B. ; 1972, VOL. 4, NUM. 0002, P. 69 A 115Serial Issue

GRABSKULPTUREN = SCULPTURES DE FOUISSAGEJEFFERIES RPS; SAVAZZI E; SCHMALFUSS H et al.1981; PALAEONTOL. KURSBUECHER, MUENCHEN; ISSN 549649; DEU; DA. 1981; VOL. 1; PP. 111-135; BIBL. 13 REF.; ILL.Article

FOSSIL CHORDATES WITH ECHINODERM AFFINITIES.DISCUSSION AND REPLY.JEFFERIES RPS; SELLWOOD BW; HILL AP et al.1968; PROC. GEOL. SOC. LONDON; GBR; 1968(11), NUM. 1649, P. 128 A 135Miscellaneous