MO. 2194. NORTH AMERICAN PARAHiTW COPEPODS—WILSON. 147 



Dorsal view of first and second antennae. Fig. 122. Ventral view of head, 

 showing frontal processes. Fig. 123. Inner surface of ventral wall of head. 

 Fig. 124. Swimming legs. Fig. 125, Side view of /'. filosa, drawn by J. H. Blake. 

 Fig. 126. Anterior view of head. Fig. 127. Dorsal view of same, both drawn 

 by J. H. Blake. 



Plate 16. 



Female of Pennella filosa. 



Figs. 128, 129. Dorsal and ventral views of head, with frontal processes and 



Internal muscles. Figs. 130, 131. External and internal views of anterior end of 



head with frontal processes removed. Fig. 132. Dorsal view of first and second 



antennae. Fig. 133. Side view of cleared specimen, showing reproductive organs. 



Plate 17. 

 Females of Pennella flto-sa and Lemaeoccra branchialix. 

 Fig. 134. Swimming legs of adult P. filosa. Fig, 135. Side view of head of 

 young female of P. filosa, 18 mm. long. Fig. 136. Second maxilla. Fig. 137. 

 Diagonal view of thorax, with swimming legs. Fig. 138. Posterior end of geni- 

 tal segment,' showing enlargement in oviduct which serves as a receptaculum 

 seminis. Fig. 139. Posterior end of abdomen, with anal laminae. Fig. 140. Side 

 veiw of cleared specimen of Lernaeocera branchialis, showing digestive tube 

 and reproductive organs (after A. Scott). 



Plate 18. 

 Female of Pennella instructa. 

 Fig. 141. Side view, drawn by J. H. Blake. Fig. 142. Ventral view of head 

 and anterior neck. Fig. 143. Anterior end of head, internal view. Fig. 144. 

 Anterior end of head, external view showing frontal processes. Fig. 145. 

 Dorsal view of first and second antennae. Fig. 146. Swimming legs. Fig. 147. 

 A specimen of P. instructa infested with goose barnacles. 



Plate 19. 



Female of Haemobaphes diceraus. 



Fig. 148. Side view of adult with egg strings. Fig. 149. Ventral view of 



head and anterior thorax, cleared in clove oil. Fig. 150. Dorsal view of head 



and anterior thorax, showing single pair of horns. Fig. 151. Ventral view of 



proboscis. 



Plate 20. 

 Haemobaphes diceraus, H. enodis, and Trifur tortuosus. 

 Fig. 152. First and second antennae of H. diceraus. Fig. 153. First and 

 second swimming legs. Figs. 154, 155. Third and fourth swimming legs. Fig. 

 156. Side view of adult E. enodis, with egg strings. Fig. 157 Ventral view of 

 head and anterior thoi'ax, showing the profusion of soft processes. Fig. 158. 

 Side view of cleared specimen of T. tortuosus, showing the arrangement of the 

 Internal organs. 



Plate 21, 

 FeuiJiies of Trifiir tortuo.'iyft and Canliodertes bellottii. 

 Figs. 159 and 160. Side view of head and anterior thorax, and of trunk of 

 T. tortuostis. This is drawn from an entire specimen but the long neck Is so 

 twisted in different directions that it does not give a satisfactory view of the 

 entire creature In any one position. Fig. 161. Side view of C. bellottii, showing 

 the lobed frontal processes. Fig. 162. Side view of head and anterior thorax, 

 showing the four pairs of legs ; the thoracic process on the side nearest the ob- 

 server has been removed. 



