PEEFACE. XI 



portion of the work now issued (Part I.) contains 



figures of three hundred and forty species, — a figure 



of every genus named, — of which one hundred and 



twenty are drawn from living, and one hundred 



and two from preserved specimens. Those who 



are familiar with the subject will, I trust, acquit 



me of vain-glory in affirming that upwards of a 



hundred figures taken from living animals in these 



low forms, constitutes a somewhat unusual feature 



in a book of this size and price. Of the character 



of the figures I must leave others to judge. 



The entire work will consist of two Parts, each 



complete in itself. Part I., now issued, includes 



the following Classes : — 



I. Poriphora. VIII. Annelida. 



II. Infusoria. IX. Eotifera. 



III. Rhizopoda. X. Crustacea. 



IV. ZOOPHYTA. XL ClRRIPEDIA. 



V. ACALEPHA. XII. ArACHNLDA. 



VI. Echinodermata. XIII. Insecta. 



VII. TURBELLARIA. 



Part II. is in a state of forwardness, and will 



be published as soon as possible. It will include 



the following Classes : — 



XIV. Polyzoa. XIX. Pteropoda. 



XV. Tunicata. XX. Cephalopoda. 



XVI. Brachiopoda. XXI. Pisces. 



XVII. CONCHIFERA. XXII. MAMMALIA. 



XVIII. Gasteropoda. 



P. H. G. 



London, July 1855. 



