[PREFACE.]

In Professor Sars' "Crustacea of Norway," quite a number of the British species of woodlice are figured in detail and described in English, but few copies of this fine work are to be met with in our country. The Rev. Canon Norman has from time to time published notes on the British species in "The Annals and Magazine of Natural History;" these are, however, scattered, and contain but few figures, while other literature that exists is out of date. Under these circumstances, we have thought that the following account and figures of all the British species would be useful to those anxious to work at the woodlice, and might also encourage others to pay attention to the distribution and habits of the interesting tribe to which they belong.

The writers would welcome any corrections or additions in view of a second edition.

W.M.W.
C.S.

Odstock, Hanwell, December, 1905.

[CONTENTS.]

PAGE
Introduction[1]
Geological history[1]
External structure and appendages[2]
Alimentary canal[6]
Circulatory system[7]
Excretory system[7]
Nervous system[8]
Reproductive organs[8]
Development[9]
Habits and Economic considerations[12]
Local names[15]
Methods of collections and preservation[16]
Classification[17]
Scheme of classification and synopsis of generic characters[18]
British Species[19]
Section—Ligiæ[19]
Family—Ligiidæ[19]
Genus—Ligia Fabricius[19]
Ligia oceanica Linzé[19]
Genus—Ligidium Brandt[21]
Ligidium hypnorum Cuvier[21]
Family—Trichoniscidæ[22]
Genus—Trichoniscus Brandt[22]
Trichoniscus pusillus Brandt[22]
Trichoniscus vividus Koch[23]
Trichoniscus roseus Koch[24]
Genus—Trichoniscoides, Sars[25]
Trichoniscoides albidus Budde-Lund[25]
Genus—Haplophthalmus Schobl[26]
Haplophthalmus mengii Zaddach[26]
Haplophthalmus danicus Budde-Lund[27]
Family—Oniscidæ[27]
Genus—Oniscus Linné[27]
Oniscus asellus Linné[27]
Genus—Philoscia Latreille[29]
Philoscia muscorum Scopoli[29]
Philoscia couchii Kinahan[30]
Genus—Platyarthrus Brandt[30]
Platyarthrus hoffmannseggii Brandt[30]
Genus—Porcellio Latreille[32]
Porcellio scaber Latreille[32]
Porcellio pictus Brandt and Ratzeburg[33]
Porcellio dilatatus Brandt[33]
Porcellio rathkei Brandt[34]