20 Echin. 
V. Echinoderma. [1000] 
7. Other body-cavities and their con- 
tents. 
Perivisceral fluid, contents ; Henri. 
8. Digestive system and its appen- 
dages. 
Jaw apparatus (3 14), Stewart’s organs 
(324), Echinothuridae ; Schurig. 
9. Nervous system and sense-organs. 
Nerves of pedicellariae ; Kiemik. 
10. Mesodermal tissues exc. skeletal. 
Integument, Echinothuridae ; Schurig, 
(313). 
Histology of pedicellariae, esp. 
muscles, Paracentrotus, Parechinus ; 
Kiernik. 
11. Dorsal organ. 
Echinothuridae ; Schurig, (329). 
12. Generative organs and gonads. 
Living ovum, protoplasm a homo- 
geneous viscid matrix containing gra- 
nules and oil globules ; its chemical 
composition, Arhaeia ; Mathews, 2. 
d. Asteroidea. 
1. General anatomy. 
Asterias rubcris (432-452, figs.) and 
general Ast. ; MacBride, 2. 
2. Symmetries. 
Hexactinic associated with pentactinic 
in Stellosphaera ; Koehler & Vaney, 1 & 2. 
3. Vacant. 
4. Skeletal tissue. 
Plates of Sphaerite s; Schoendorf, 2 
(206, fig.). 
5. Skeletal anatomy. 
Structure of Sphaeritea (or Sphaera- 
stev ) ; Schoendorf, 1 and 2 (figs, and pis.). 
9. Nervous system and sense-organs. 
Histology of actinal nerve system, 
Asterias rubens, also gland-cells, sense- 
cells, and dorsal peritoneal epithelium ; 
Meyer. 
Epithelial glands, Echinaster, Cri- 
brella ; Barthels. 
10. Mesodermal tissues exc. skeletal. 
Histology various muscles connected 
with nerve-system Asterias ; Meyer. 
11. Vacant. 
12. Generative organs and gonads. 
Living ovum of Asterias (cf. c. 12) ; 
Mathews, 2. 
Relations of polar bodies, chromo- 
somes, and centrosome in ova and sperm- 
ova of Asterias ; Tennent & Hogue. 
e. Ophiuroidea. 
1. General anatomy. 
Ophiothrix frag'dis (478-491 , figs.) and 
general Oph. ; MacBride 2. 
2, 3, 4. Vacant. 
5. Skeletal anatomy. 
Radifil plates of Ophiothrix, articulated 
to vertebrae (vide 1011, 3) ; MacBride 1. 
6-12. Vacant, 
f. Crinoidea. 
1. General anatomy. 
Antedon rosacea ( = bifida ); Mac- 
Bride, 2 (581-589, figs.) 
2 and 3. Vacant. 
4. Skeletal tissue. 
Mg C0 2> 11.72%, organic matter 22% 
in cirri and arms of alcoholic Metacr ; 
Nichols, (49). 
6, 7, 8. Vacant. 
