ADDITIONS AND CORRECTIONS. 



Page 38, line 17, for Stenosomata read Stenostomata. 



40, 22, for [ambulacra] read [ambulacral feet], and 

 transfer to preceding line after "retractile 

 tube-feet." 



49, after Nematelmia. add Prof. Huxley proposes "to esta- 

 blish a division Trichoscolices," characte- 

 rized by the presence of cilia, "in order to 

 discriminate the morphological type which 

 they exemplify from those of the Nemato- 

 scolices, containing the Nematoidea." With 

 the latter he includes the Nematorhyncha of 

 Biitschli (Ichthyditim and its allies). 



97, line 3, after Ixodidai add (Ticks). 



157, 2 from the bottom, for Solon read Solen. 



183, 

 221, 

 246, 

 290, 



6 from bottom, place Embiotica before Ditrema. 

 6 from bottom, for Eudynamys read Eudynamis. 

 9, for HEBEDIDENTATA read HEBEDIDENTATI. 

 8 from bottom, for an insect read a crustacean. 



The star before the genus denotes that its species are 

 extinct. 



