4 
List of the Contents of each Tank. 
Anemones, etc., which he may find moving among the rocks 
in various tanks. After seeing tank 23 he will be prepared to 
trace such vagaries to the little crab which is their cause. 
Enquiries of any kind may be made of the attendant. 
Tank]S T o. 
1. 
Echinoderms (p. 28). A. Starfishes or "five-fingers”, with 
five (rarely more) creeping arms. B. Brittle-stars, with 
five (rarely six) arms, thinner and more snake-like 
than A., round body like a thick half-penny ( Ophio - 
derma , p. 31). C. Sea-urchins, globular or bun-shaped, 
covered with spines. D. Feather-stars ( Antedon , p. 31), 
mostly holding by their backs to dead coral-stems 
(.Antipathes , see tank 21) in the centre of the tank; 
they are yellow or red and have ten plumed arms. 
E. Sea-cucumbers, slug-shaped bodies, covered with 
pointed suckers. A., C., and E. adhere to the glass 
or rock by suckers, with which they crawl, B. move 
by wriggling, D. can swim. The delicate brown 
feathery undergrowth will be seen to be the ten¬ 
tacles of numerous sea-cucumbers ( Cucumaria cucumis , 
p. 31), adhering to the rocks; each has ten tentacles 
round its mouth, in crawling they are retracted; in 
the larger species ( Holotkaria tubulosa , p. 32) which 
is black, they are not obvious; Stichopus (p. 32) is 
reddish, a foot long, and flat. 
Further details. — Starfishes. Echinaster (p. 31), 
red and slender-armed; Luidia (p. 31), much larger 
and generally with seven arms; Asterias (p. 31), 
large and greenish, with pointed knobs; Astropecten 
(p. 31), with points like little tusks fringing the 
arms; Palmipes , arms webbed, like a pentagonal 
piece of brick-red paper. — Sea-urchins. Sphaer- 
echinus (p. 32), generally purplish, spines tipped 
white; Echinus (p. 31), eight to ten inches across, 
spines white; Dorocidaris (p. 32), pink with knobs, 
bearing a few strong, stick-like spines. 
2. 
Fishes. Sea-crow ( Corvina , p. 86), dark-coloured, dark 
lower fins. Box (p. 86), silver with golden lines. 
Oblata (p. 86), silver, black root to its tail. These 
all feed on the green alga, the lettuce sea-weed ( Ulva 
