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Geological Society, London, Special Publications; 1967; v. 2; p. 583-599;
DOI: 10.1144/GSL.SP.1967.002.01.40
© 1967 Geological Society of London

Invertebrata

Chapter 22 Echinodermata: Eleutherozoa

B. N. Fletcher, Ph.D. F.G.S., G. M. Philip, M.Sc. Ph.D. F.G.S. & C. W. Wright, M.A. F.G.S.

, Plot 13, Linkdale Estate, Maldon Road, Gt. Boddow, Essex
Geology Department, University of New England, Armidale, New South Wales, Australia
, 37 Phillimore Gardens, Kensington, London W 8

Subphylum ECHINOZOA Haeckel in Zittel 1895

[Classes Helicoplacoidea Durham & Caster 1963 and Cyclocystoidea Miller & Gorley 1895, placed in Echinozoa in Treatise U, are documented in Chapter 21 of this volume—Ed.]

Class EDRIOASTEROIDEA Billings 1858

First, Camb M.Camb: Stromatocystites walcotti Schuchert, Olenellus Beds, East Arm, Boone Bay, Newfoundland (Schuchert 1919).

Last, Carb Namur: Hemicystites ? carbonarius Bassler, Bluefield Group, Adds Valley, Western Virginia, U.S.A. (Bassler 1936).

Constituent families: Agelocrinitidae Jaekel, M.Camb-Carb Namur; Edrioasteridae Bather, Ord Carad; Cyathocystidae Bather, Ord Llvirn-Ashg; ? Steganoblastidae Bather, Ord Carad.

Comment: The Steganoblastidae (based on Astrocystites Whiteaves) can only be referred questionably to this class.

Class OPHIOCISTIOIDEA Sollas 1899

First, Ord Arenig: Volchovia mobilis Gekker, Magalaspis lst (BII), Volkhov, Leningrad district, U.S.S.R. (Gekker 1940).

Last, Dev Eifel: Rhenosquama westfalica Richter, Selscheider beds, Ebbelinghausen, Westphalia, Germany (Richter 1930).

Constituent families: Eucladidae Gregory, Sil Ludl; Rhenosquamidae Richter, Dev Eifel; Sollasinidae Fedotov, Sil Wenl-Ludl; Volchoviidae Gekker, Ord Arenig.

Comment: Ophiocistioids are known only from Europe and U.S.S.R.

Class INCERTAE SEDIS

Order MEGALAPODA MacBride & Spencer 1938

First and Last, Ord Ashg: Eothuria beggi MacBride & Spencer, Drummock Group, Girvan, Ayrshire, Scotland (MacBride & Spencer 1938).

Constituent family: Eothuriidae MacBride & Spencer.

Comment: The genus Eothuria, originally described as a plated holothurian, is probably best considered as an early aberrant echinoid related to the Lepidocentroida.

Class ECHINOIDEA

Subclass REGULARIA Latreille 1825

Superorder PSEUDOECHINACEA Mortensen 1935

Order BOTHRIOCIDAROIDA Zittel 1879

First, Ord Carad: Bothriocidaris pahleni Schmidt, Johvi stage (DI), Estonia (Jackson 1912; Männil 1962).

Last, Ord Ashg: Bothriocidaris eichwaldi Männil, Vormsi stage (FIC), Estonia (Männil 1962).

Constituent family: Bothriocidaridae Klem.

Superorder PERISCHOECHINACEA McCoy 1849

Order CIDAROIDA Claus 1880

First, Dev Eifel:

...

This 250-word extract was created in the absence of an abstract.