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This creature is still known by many as Echinus granulatus. this name being given within twelve years by Agassiz in his “ Methods of Study in Natural History.” The following list shows the successive changes in its name since that time:

Echinus granulatus.
Euryechinus granulatus.
Toxopneustes dröbachiensis.

Euryechinus dröbachiensis. And at this date of going to press this unfortunate creature bears the name of

STRONGYLOCENTROTUS Dröbachiensis.

And yet this little animal will be known by the name of Seaurchin long after the time when the systematists and their distracting nomenclature will have been forgotten.

E. S. M.

November 1875.

126; How they lay their Eggs, and Young, 127; Comparison between Myrio-

pods and Insects, 127, 123; Some Characters of Insects, Spiders, and Myriopods,

129.

CHAPTER XVII.

CRAW.FISH AND LOBSTER

· 130

Craw-Fish, where found, 130; Regions of, 131 ; Mouth Parts and Appendages, 132,

133; Gills, 134; How to arrange Parts, 135, 136; Moulting, 137; Young Lob-

ster, 138.

CHAPTER XVIII.

Crabs, HERMIT-CRABS, AND OTHER CRUSTACEANS

· 138

Common Crab, 139; Eggs, and how they carry them, 140 ; Fin-like Legs, Oyster

Crab, 141 ; Hermit Crab, 142-144; Fresh-water Crustaceans, 144; Sowbug and

Eggs, 145, 146; Regions of Crustacea, 146, 147.

CHAPTER XIX.

BIVALVE CRUSTACEANS AND BARNACLES

· 147

Characters of, 148, 149 ; Where found, 150; Appendages, how they secure their

Food, 151'; Young Barnacles, 152, 153.

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