PREFACE TO SECOND EDITION". Vll 



now be proposed for the first time such, for example, as Cheli- 

 pkorus for Chelifer, Petromyxon for Petromyzon, Loliginopsis for 

 Loligopsis. Another class of errors is the non-duplicature of the 

 r, as in Stylorhynchus, Biorhiza, Ptilorhis ; but this form is all 

 but universal. Again, the practice of making ma or oma neuter 

 is not so generally adopted that I have thought it necessary to 

 make any change in the termination of the family names when I 

 could find no authority for doing so ; id& and atidce are there- 

 fore used indifferently. For the omission of that ill-used h in 

 such words as Ryngota, Ramphodon, Sarcoramphus I am not 

 responsible, or for its appearance in Micrhyla, Philhydrus, En* 

 hydra, &c. Lastly, objection has been taken to the use as ordinal 

 names of such words as Ecardines, Leptocardii, Polypi, Plecto- 

 gnathi ; but here, as well as in others, except where they were 

 intolerable, I have but followed suit. .Amongst about 5700 

 generic names, exclusive of numerous others, mentioned in this 

 little work, there are still, I am afraid, printer's errors and 'my 

 own to be accounted for. 



Out of the 60.000 genera of the animal kingdom I have selected 

 those which are the best known or are the most representative. 

 The genera of the Protozoa, Coelenterata, and Echinodermata are 

 largely in excess of the other subkingdoms on account of the 

 interest of recent investigations. The class of Insects is least re- 

 presented in proportion, the Coleoptera especially having less 

 than an eighth of their number. 



There are now so many special terms to be met with in Biolo- 

 gical science that I have thought a Glossary would be useful. 



