xiv LIST OF ILLUSTRATIONS 



FACING PAGE 



Upper surface of Common Starfish 59 



Starfishes climbing side of tank and turning over ... 59 



Astropecten irregularis . . . . . . . . 62 



A " Sun " Starfish 62 



Palmipes membranaceus, the so-called " Bird's Foot " Starfish . 63 



Ophiothrix fragilis, the Common Brittle Star ... 63 



Ophiopluteus larva of O. fragilis 63 



Egg and larva of Asterina gibbosa ...... 64 



Advanced larva of Asterina gibbosa . . . .64 



Adults of Asterina gibbosa . . . . . . * 64 



The Rosy Feather Star : Antedon rosacea . * * $ 65 



Rosy Feather Star . . \ . . . ^ . . 65 



Pentacrinoid larva of Antedon . . ft . v ,,. 68 



Pentacrinoid larva of Antedon: later stage . . , . 68 



Upper and under surface of Sea Urchin (Echinus esculentus) . 69 



Sea Urchin with extended tube feet . ... . . . 70 



Test and jaws of Echinus (Echinus miliaris) . . 7 



Heart Urchin (Echinocardium cor datum) . '[ . . ^ *, , 71 



Tests of Heart Urchin: upper and under surface . ^ . 71 



Holothuria nigra . . , . * ^. .. . . 72 



Cucumaria normani . . . . . ,^ ; ... .^.^ 72 



Synapta, a worm-like Holothurian i *, . ^. . 72 



Auricula larva of Synapta . . . . .,,*. 7 2 



Leptoplana tremellaris . . . . . . ? 73 



Trichina spiralis encysted in muscle . . ? f ^ ; , :;; . 73 



Tomopteris scolopendra . . .- > . ^ v w .^ ~ . 74 



Amphiglina mediterranea . . . *. . 74 



Phyllodoce laminosa . . - . . > . j^^ . 75 



Nephthys Hombugi. . :^., .. ; > :jfi . /,,.#>:. 75 



Nereis cultrifera . . . . ^ . > 7^ 



Arenicola marina . . . ... >.., . . 76 



Two free swimming Rotifers ....... 77 



Melicerta, the so-called " Brick-maker " Rotifer ... 77 



Part of a colony of Flustra foliacea >;, .... 88 



Part of a colony of Bugula avicularia . . . - . .88 



