118 
NATURAL HISTORY. 
[N. ZOOL. GAL. 
f* 
middle of their back is furnished with a bunch of hooked fibres, by 
which they attach themselves to corals, sea-weeds, &c. ; and some of 
those which are free in their adult state are attached by a peduncle 
when very young. 
•* The Class Crinoidea (Case 24) are furnished with five arms 
having a series of processes on each side like a feather. The arms 
are generally forked at their base, and often repeatedly subdivided. 
Their body is surrounded with hard shelly plates. One recent genus, 
Comatula , is free, but the other Pentacrinites, and many of the fossil 
genera, as Encrinites and Poteriocrinites, &c., have an elongated 
peduncle, which is furnished wnth claspers, like those on the back of 
the Comatula. 
The Glass Sph^ronoida are only found fossil and like the former, 
but they have no arms, and the body is more or less spherical, with a large 
aperture closed by five valves on the side of the vertex, between it and 
the costals, and they are only marked with scattered pores. 
The Glass Blasteroida ( Case 24) appear to be nearly allied to the 
Crinoidea , but they chiefly differ in having no arms, and in their body 
being marked with five double series of holes like the ambulacra of Sea 
Eggs, as the genera Pentremites and Orbitremites. They are only 
found in a fossil state. 
The following List will show at one view the arrangement of the 
Radiated Animals, and the Numbers indicate the Table Cases of this 
Room in which the genera in the collection are placed. 
Sub-kingdom. Stomopneustes, 4. 
C entronije. —Texppneustes, 4. 
Echmometra, 5. 
Colobocentrus, 6. 
Heterocentrus, 6. 
Section I. 
E C HI NOD E RM AT A. 
Class I. 
Ditremata. 
Fam. 3. Scutellidce. 
Echinanthus, 7* 
Lagana, 7* 
Order I. Echinida. Echinocyamus : 
„ Fibularia, 7- 
Fam. 1. Cidandce. — - - 
Cidaris, Case 1. 
Acrocidaris. 
Pedina. 
Tetragramma. 
Acrosalenia. 
Eehinopsis. 
Hemicidaris. 
Diadema, 1. 
Astropyga. 
Fam. 2. Echinidce. 
Cyphosoma. 
Salentia, 2. 
Peltastes. 
Goniopygus. 
Goniophorus. 
Aeropeltis. 
Arbacia, 2. 
Echinus, 2, 3, 4. 
Hipponoe, 4. 
Holopneustes, 4. 
Temnopleurus, 4. 
Pleu.recturus, 4. 
Mierocyphus, 4. 
Amblypneustes, 4. 
• Taimac-ia, 4. 
Echinarachnius, 8. 
Echinodiscus, 8. 
Encope. 
Amphiope. 
Heliophora. 
Lobophora. 
Fam. 4. Galeritid-e. 
Echinolampas, 9. 
Conoclypeus. 
Pyguriis*. 
Cassidulus. 
Amblypygus. 
Clypeus. 
Nucleolites. 
Echinobrissus, 9. 
Catopygus. 
Pygorhynehus. 
Hyboclypeus. 
Galerites, 9. 
Pyriria. 
Globator. 
Nucleopygus. 
Pygastev. 
Discoidea. 
Holaster. 
Disaster. 
Fam. 5. Spatangidce. 
Hemipneustes. 
Micraster, 9. 
Brissus, 9. 
Brissopsis. 
Ova, 10. 
Toxaster. 
Amphidetus, 10. 
Spatangus, 10. 
Echinocardium, 10. 
Echinoneus, 10. 
Pachvgaster. 
Echinocorys, 10. 
Order II. Holothu- 
RIDA. 
Fam. 1. Holothuridce. 
Holothuria. 
T repang. 
Mulleria. 
Bohadschia. 
Fam. 2. Cuvieriadce. 
Cuvieria, 10. 
Psolus. 
Fam. 3. Synaptidce. 
Synaptes. 
Chirodota. 
Thyone. 
Fam. 4. Pentactidce. 
Pentacta. 
Fam. 5. Siphuncu- 
lidae. 
Siphunculus, 10. 
Class II. 
Hypostomata 
O rd. I. Asteroida. 
Fam. 1. Asteriadae. 
Asterias, 11, 12. 
Heliaster, 12. 
Tonia, 12, 
Fam. 2. Astropecti- 
nidce. 
Naurieia, 13. 
Astropecten, 13, 14. 
Luidia, 14. 
Petalaster, 14. 
Solaster, 14. 
Polyaster, 14. 
Henrieia, 14. 
Fam. 3. Pentacei'idce. 
Culcita. 
Pemaceros, 15. 
Stellaster, 16. 
Hippoaster, 16. 
Calleaster, 16. 
Goni aster, 16. 
Echinaster, 19. 
Gymnasteria, 17- 
Dactylosaster, 17 . 
Stellonia, 17 . 
Cribrella, 17. 
Linckia, 17. 
Fam. 4. Ast&'inidce. 
Palmipes, 18. 
Asterina, 18. 
