The Cambridge natural history, Vol. 01 (of 10)

by Marcus Hartog; Sydney J. Hickson; E. W. MacBride; Igerna Brünhilda Johnson Sollas

of corona of Echinoidea—see Interambulacral plate

Interradial septa, of Asterias rubens, [437];

of Heliasteridae, [474];

absent in Brisingidae, [475]

Interradius, [428];

of Asterias rubens, [434];

of Echinus esculentus, [504];

of Holothuria nigra, [562]

Interstitial growth, [10]

Intestine, [415];