Pars 3 
Stelleroidea. 
5 
No Stelleroidea are as yet known below the Middle Ordovicic, but 
here we already meet with botli plianerozonian and cryptozonian asterids, 
and witli aulurids. The class therefore had its origin certainly in the Lower 
Ordovicic, and probably as far back as the Cambric. 
In the Ordovicic („Un t e r s i 1 u r“ of the German geologists) occur 
the following 19 genera and 57 species*): 
Alepidaster (AL) 3 
Anorthaster (A) 1 
Ataxaster (A) 1 
Bohemura (AL) 1 
Eophiura (AL) 1 
Hudsonaster (A) 6 
*Mesopalaeaster (A) 9 
Palaeura (AL) 1 
?*Palasterina (A) 1 
*Petraster (A) 3 
In the Siluric („Obersilur“ of the German geologists) lived the 
following 20 genera and 35 species: 
Bdellacoma 
Promopalaeaster (A) 10 
*Protaster (AL) 2 
♦Schuchertia (A) 2 
Siluraster (A) 1 
*Stenaster (A) 2 
Taeniaster (AL) 4 
Tetraster (A) 2 
Uranaster (A) 1 
*Urasterella (A) 6 
(AL) 1 
Eucladia 2 
*Eugasterella (AL) 1 
Euthemon 1 
Gregoriura (AL) 1 
Lawporthura (AL) 1 
Lepidaster (A) 1 
Lindstromaster (A) 1 
*Mesopalaeaster (A) 4 
Palaeaster (A) 1 
♦Palasterina (A) 2 
*Petraster (A) 1 
*Protaster (AL) 3 
Rhopalocoma (AL) 
*Schuchertia (A) 1 
Squamaster (AL) 1 
?*Stenaster (A) 1 
Stiirtzaster (AL) 4 
Stiirtzura (AL) 3 
*Urasterella (A) 4 
The Devonic has 41 genera 
Agalmaster (A) 3 
*Astropeeten (A) 1 
Bundenbachia (AL) 1 
Cheiropteraster (A) 1 
Devonaster (A) 2 
Echinasterella (A) 2 
Echinasterias (A) 1 
Echinodiscites (A) 1 
Echinostella (A) 1 
Eifelaster (A) 1 
Encrinaster (AL) 9 
Eoluidia (AL) 1 
Eospondylus (AL) 1 
?Eueladia 1 
♦Eugasterella (AL) 1 
Furcaster (AL) 2 
Hallaster (AL) 1 
Helianthaster (A) 2 
Jaekelaster (A) 1 
Lepidasterella (A) 1 
Loriolaster (A) 1 
The Lower Carbonic has 
Aganaster (AL) 1 
Cholaster (AL) 1 
Compsaster (A) 1 
?Cribellites 1 
and 59 species, as follows: 
Medusaster (A) 1 
?*Mesopalaeaster (A) 2 
Miomaster (A) 1 
Miospondylus (AL) 1 
Ophiurina (AL) 1 
Palaeopliiomyxa (AL) 1 
Palaeophiura (AL) 1 
Palaeosolaster (A) 2 
Palaeostella (A) 1 
Palasteriscus (A) 1 
Palastropecten (AL) 1 
Pseudopalasterina (A) 1 
Ptilonaster (AL) 1 
Rhenaster (A) 1 
Spaniaster (A) 1 
Sympterura (AL) 1 
?*Tremataster (AL) 1 
Trimeraster (A) 1 
*Urasterella (A) 1 
Xenaster (A) 4 
genera and 15 species, as follows: 
Neopalaeaster (A) 1 
Onychaster (0) 5 
Schoenaster (A) 4 
*Trcmataster (AL) 1 
In the Upper Carbonic occur only 5 genera and 6 species: 
Australaster (A) 2 ?*Stenastcr (A) 1 
Calliasterella (A) 1 *Urasterella (A) 1 
Monaster (A) 1 
*) Genera marked witli a * occur also in other periods ; those raarked witli a ? are 
of doubtful occurrence in the period cited. Figures indicate the number of species. 
