EXPLANATION OF PLATE XXV. 



FIGURE 160. Utriculus canaliculatus, (p. 663 ;) enlarged. 

 161. Bulla solitaria, (p. 662;) natural size. 

 162. Ampliisphyra debilis, (p. 663;) enlarged. 

 163. Cyliclma alba, (p. 664 ;) natural size. 

 164. Cylichna oryza, (p. 664 ;) enlarged. 

 165. Action puncto-striata, (p. 664;) enlarged. 

 166. Trachydermon ruber, (p. 662 ;) natural size. 

 167. Cheetopleura apiculata, (p. 661 ;) natural size. 

 168. Alexia myosotis, (p. 662;) natural size. 

 169. Melampus bidentatus, (p. 662 ;) natural size. 

 169a. The same; banded variety, (p. 662;) natural size. 

 170. Doto coronata, (p. 665;) a, dorsal view, enlarged; I, liead, from above; 



c, one of the branchiae 



171. Elysiella catulus, (p. 6(58;) enlarged three diameters. 

 172. Elysia clilorotica, (p. 667 ;) enlarged two diameters. 

 173. Doridella obscura. (p. 664 ;) o, dorsal view ; &, ventral view, enlarged. 

 174. Montagua pilata, (p. 666;) natural size. 

 175. Henna? a cruciata, (p. 667;) enlarged. 

 176. Doris bifida, (p. 664 ;) enlarged three diameters. 

 177. Cavoliua tridentata, (p. 669;) natural size. 

 178. gtyliola vitrea, (p. 668;) enlarged three diameters. 



(Figures 171, 172, 173, 174, 178 were drawn from nature, by A. E. Verrill: 1G9, 170 by E. S. Morse ; 

 175 by A. Agassiz; 17(&amp;gt;, by J. IT. Emerton ; 177 was copied from Cuvier. (last ill. ed.). The rest are from 

 Binney s Gould, mostly by E. S. Morse.) 



