EXPLANATION OF PLATE XXV. 



FiGUKE 160. — Utriculus caualiculatus, (p. 663;) enlarged. 

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

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

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

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

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

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

 167. — Cbsetopleura 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; ft, bead, from above ; 



c, one of tbe brancbi^. 

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

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

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

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

 175. — Herma^a cruciata, (p. 667;) enlarged. 

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

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

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



(Figures 171, 172, 17.3, 174, 178 were drawn from nature, "by A. E. Verrill ; 1C9(T, 170 by E. S. Morse; 

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

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



