EXPLANATION OF PLATE XXV. 



Figure ICO. — Utriculus canaliculars, (p. G63 ;) enlarged. 

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

 162. — Amphisphyra debilis, (p. 663 ;) enlarged. 

 163. — Cylichna alba, (p. 664 ;) natural size. i 



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

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

 166. — Tracbydermon ruber, (p. 662 ;) natural size. 

 167. — Chretopleura apiculata, (p. 661 ;) natural size. 

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

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



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



170. — Doto coronata, (p. 665 ;) a, dorsal view, enlarged; i, bead, from above ;. 



c, one of the branchiae. 

 171. — Elysiella catulus, (p. 668;) enlarged three diameters. 

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

 173. — Doridella obscura, (p. 664;) a, dorsal view ; i, ventral view, enlarged. 

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

 175. — Herrnsea cruciata, (p. 667 ;) enlarged. 

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

 177. — Cavolina tridentata, (p. 669;) natural size. 

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



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

 175 by A. Agassiz ; 176, by J. H. Emerton ; 177 was copied from Cuvier, (last ill. ed.) Tbe rest are from 

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



