PREFACE. xi 



portio: v 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. REIZOPODA. X. CRUSTACEA. 



IV. ZOOPHYTA. XI. ClRRIPEDIA. 



V. ACALEPHA. XII. ARACHNIDA. 



VI. ECHINODERMATA. XIII. INSE^CTA. 



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. 



