EXPLANATION OF PLATE XXV. 



FiGUHE 160. — Utriculus caualiculatus, (p. 6G3 ;) enlarged. 

 161. — Bulla solitaria, (p. G62;) natural size. 

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

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

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

 165. — Acta^ou puucto-striata, (p. 664;) enlarged. 

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

 167. — Cba^opleura apiculata, (p. 661 ;) natural size. 

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

 169. — Melampus bidentatus, {-p. 662;) natural size. 

 169rt. — Tbe same ; banded variety, (p. 662;) natural size. 

 170. — Doto corouata, (p. 665 ;) a, dorsal Tiew, enlarged ; h, bead, from above ; 



c, one of tbe brauchi:ie. 

 171. — Elysiella catulus, (p. 663;) enlarged three diameters. 

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

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

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

 175. — Hernia>a 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 n.itnre, l)y A. E. Verrill ; 169ff, 170 by E. S. Morse; 

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

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



