178 



Fart III. — Twenty-first Annual Report 



Fig. 113. First pereiopod (chela) (part of), first young stage, to show the 



hairs on the upper or anterior surface of the appendage, . x 57 



Fig. 114. Coxopodite and basi-ischiopodite joints of fifth pereiopod, first 

 young stage. 



Plate XI. 



Fig. 115. Hinge of dactylopodite of chela, first young stage. 



Fig. 116. Third pereiopod (part of), first young stage, . . . x 57 



Fig. 117. First four abdominal joints. III. Zoea ; jo/. pleopod, . . x 57 



Fig. 118. Abdomen, I. Zoea, . . . . . . x 120 



Fig. 119. Telson, II. Zoea; an. anus, . . . . . x 120 



Fig. 120. Long toothed spines of telson, I. Zoea. 



Fig. 121. Telson, III. Zoea, . . . . , . x 57 



Fig. 122. Telson, I. Zoea ; 5 ah. fifth abdominal segment, . . x 120 



Fig. 123. Coxopodite, and portion (&.) of basi-ischiopodite, proximal to 

 fracture plane [fr.). 



Fig. 124. First four abdominal joints, II. Zoea, . . . . x 120 



Fig. 125. Second abdominal somite, ventral view, II. Zoea. 

 Fig. 126. Fifth pereiopod, first young stage. 



Fig. 127a. Telson and fifth pair of pleopods, Megalops, ventral view. 

 Fig. 127&. Telson, Megalops, dorsal view, .... 

 Fig. 128. Hair from dorsal surface, abdomen, first young stage. 

 Fig. 129. Abdomen, IV. Zoea, ..... 

 Fig. 130. Third pleopod, Megalops, .... 

 Fig. 131. First, second, and third abdominal segments ; pi. pleopod 



ventral view, ...... 



Fig. 132. Second pleopod, Megalops, .... 



Fig. 133. Carpopodite joint of chela, first young stage. 



Fig. 134. Basal joint (protopodite) and endopodite of third pleopod, 



Megalops, . . . . . . . x 220 



Fig. 135. Long hair from ischiopodite of fourth pereiopod, first young 



stage. 



Fig. 136. Hooks on ends of the two endopodites of the first pleopod, 

 Megalops. 



Fig. 137. Telson, IV. Zoea ; 5 pi. fifth pair of pleopods, . . . x 57 



Fig. 138. Abdomen, Megalops, side view ; the pleopods are not completed, x 57 

 Fig. 139. Telson, I.Zoea, ventral view, showing the circular aperture {op.) 



in the integument through which the end of the gut and 



anus projects, . . . . . . . x 140 



Fig. 140. Coxopodite and portion of basi-ischiopodite proximal to the 



fracture plane, of chela, first young stage, sternum. 

 Fig. 141. Fourth pleopod, Megalops, . . . . . x 57 



Fig. 142. First pleopod, Megalops, . . . . . x 57 



Fig. 143. Abdomen, Megalops, dorsum, . . . . . x 35 



X 57 



X 57 



X 57 



X 57 



X 120 



X 100 



X 57 



Plate XII. 



Fig. 144. Third pleopod, Megalops, . . . . . x 57 



Fig. 145. Abdomen, first young stage, . . . . . x 60 



Fig. 146. IV. Zoea, . . . . . . . . x 19 



Fig. 147. III. Zoea, . - . . . . . . x 19 



Fig. 148. II. Zoea, . . . . . . . . x 19 



Fig. 149. Sternum, Megalops, . . . . . . x 57 



Fig. 150. Sternum (thorax), IV. Zoea, . . . . . x 120 



Fig. 151. Abdomen, first young stage, external surface, . . . x 57 



Fig. 152. Megalops, . . . . . . . x 19 



Fig. 153. Carapace, Megalops, . . . . . . x 57 



Fig. 154. Cephalic region, Megalops, ventral surface, . . . x 57 



Fig. 155. Penes ; 1 p. anterior penis ; 2 p. posterior penis, of a Carcinus 

 mcenas, measuring 5*5 mm. across the greatest breadth of 



the carapace . . . . « . x 120 



Fig. 156. Third pleopod, first young stage, . . . . x 120 



Fig. 157. Eye of IV. Zoea, . . . . . . . x 220 



Fig. 158. Fifth pair of pleopods, and telson, first young stage, . . x 120 



Fig. 159. I. Zoea, . . . . . . . . x 19 



Fig. 160. Protozoea, . . . . . . . x 120 



Fig. 161. Cast integument, I. Zoea, side view, o. cornea, . . x 48 



