ERRATA AND CORRIGENDA. 



Page 43. Verenad,!e.— This family is to be erased, as the animal is like Tricho- 

 tropis. I was misled by the incorrectness of the description and 

 figure. 



Page 63. Tylodinad^e. — This family is to be removed to Pleurobranchiata at 

 page 203 ; a specimen of the animal and shell having since come 

 into my possession. 



Pages 135 & 167. For Cirrhobranchia read Cirrobranchia. 



Page 141. Erase Chrysostoma, which is inserted in its correct place as part of 

 Livona at page 156. 



Page 159. For Slomatia read Slomax. 



