EXPLANATION OF PLATE XXYV. 
FiGure 160.—Utriculus canaliculatus; (p. 663 ;) enlarged. 
161.—Bulla solitaria, (p. 662 ;) natural size. 
162.—Amphisphyra debilis, (p. 663;) enlarged. 
163.—Cylichna alba, (p. 664 ;) natural size. 
164.—Cylichna oryza, (p. 664 ;) enlarged. 
165.—Actieon puncto-striata, (p. 664;) enlarged. 
166.—Trachydermon ruber, (p. 662 ;) natural size. 
167.—Chtopleura 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 ; }b, head, from above; 
c, one of the branchi: e. 
171.—Elysiella catulus, (p. 668 ;) enlarged three diameters. 
172.—Elysia chlorotica, (p. 667 ;) enlar ‘eed two diameters. 
173.—Doridella obscura, (p. 664 ; SG dorsal view ; b, ventral view, enlarged. 
174.—Montagua pilata, (p. 666 ; :) natural size, 
175.—Hermiea cruciata, (p. 667 ;) enlarged. 
176.—Doris bifida, (p. 664; ;) enlarged three diameters. 
177.—Cavolina tridentata, (p. 669; ;) natural size. 
178.—Styliola vitrea, (p. G68 5) enlarged three diameters. 
(Figures 171, 172, 173, 174, 178 were drawn from nature, by A. E. Verrill; 169a, 170 by E. S. Morse; 
175 by A. Agassiz; 176, by J. H. Emerton; 177 was copied from Cuvier, (last ill. ed. ). Therest are from 
Binney’s Gould, mostly by E. S. Morse.) 
