250 ECHINODERMATA—ECHINOZOA SUB-BRANCH III 
thurian origin, but as a rule are incapable of more precise determination. 
On the other hand, however, Schlumberger has described a number of minute 
calcareous bodies from the Calcaire Grossier (Eocene) of Paris, which seem 
very certainly referable to the genera Synapta, Chirodota, and Myriotrochus. 
TABLE SHOWING THE VERTICAL RANGE OF THE ECHINOIDEA. 

Families. 
Carboniferous. 
Cretaceous. 
Ordovician. 
Silurian. 
Devonian. 
Permian. 
Tertiary. 
Recent. 
Jura. 

I. Paleechinoidea 
Order 1. Cystocidaroida So Rs eee ee Sale cd FPP ale Ne 
», 2. Bothriocidaroida SSS Se pacar | peerseer cree 30s | 
», 3 Perischoéchinoida  }...... psn eee ee SS ee ee Del Es 5 
II. Euechinoidea 
Order 1. Cidaroida 
1. Cidaridae Neer 8 2 
Order 2. Diadematoida 
1. Echinothuridae 
2eSaleniidaewy 2 Aare Fuster S| al Seer eee ——(a 
3) lalierukoobnancleyey "| a ee je oe ee See ee 
Ape Wiad emmatid eum | mani seen eee eee ene ee ee 
by (CrralavostovanentGleys) | eee eo oce [Log seeedfoceccn [eons aa 
Gs eAmbacidae ye Nk Ce 5| src Bl cel ieee laee 2 ee a 
Jomlemmo ple uric aie: oy Ma ii ers efi eee een | eee Leer = a 
Se snichimometridae 0 Wied. bee cee cee Ate cl nee oer see — 
Seed Deiat oH 6 Feige em MAM | [etoa es | Lemecetel a) Sour) ME ee Sea | Lae | Oe SS 
Order 3. Holectypoida Rep ae || roe en be aes : ROE lay ae aes | 
», 4. Clypeastroida | | | | 
1. Fibulariidae awe |e Psalm eg ee a 
2 Clypeastridae: | | Pe pe-se4ll st. -.|/--ccccall ese several | ean frees eemeeee |_| 
3. Scutellidae _ Ie ee ed (ene eee || Pes en lle oO — 
| 
Order 5. Spatangoida | | | 
Je Hchinoneidac | = tes | bOI Sete oe lo, |e ie ae ee — 
2. Cassidulidae s\ reese ced poecocre koa: Sey peocctoy5 [esos ne 
3. Collyniridag: 96 |) ieee |e co Cee cee a | 2 | 
4, Ananchytidae Feoved| sc oereleerese tetrad] seer lovences ieee SS 
5. Spatangidae elesncal|leoce coe has aenaloesmence] ee neeel | Ocoee duceeee |) 
By LLaskiigdnee ee alee Teaba) pee al ee StL ac FE (). eae ee | ee eee 
7. Pourtalesiidae pele LA ek ae [N4iveis @ Reeeest neta Fens 

