EXPLANATION OF PLATE XLV. 



Thalanessa oculata, M'tntosh. 



Fig. 118. — View of an elytron from about the middle of the 

 body, in situ (enlarged), showing the typical shape 

 and its relation to the parapodia and segments. 

 ep. elytrophore of this elytron, ep' elytrophores of 

 the preceding and of the succeeding segments, one 

 of the latter being covered by the elytron. 



Fig. 111). — A parapodium from the mid-body (x 90). a, 

 ciliated pad ; b, cirriform process of the notopod. 

 The dotted structures are the characteristic mem- 

 branous li])s on the neuropod ; the chsetse are dia- 

 grammatically represented in that no attempt is 

 made to give their shape. 



Fio. 120. — Dorsal view of a normal, mid-body segment of 

 the left side, nrp., neuropod ; nip., notopod. The 

 filamentous lip process of the latter is bent back- 

 wards. 



Fig. 121. — Dorsal view of the first parapod of the left side 

 (enlarged), showing the great development of the 

 membranous lip. p, a horny eapside, many of 

 which are attached to the chaetae along the body. 

 (? egg cajisulc of mollusc). 



Fig. 122. — Dorsal view of the fourth parapod, showing the 

 digitiform processes on the notopod ; the two mem- 

 ])ranous lips of the neuropod are bent backwards. 



Fig. 123. — The fourth parapod of the right side ( X 90). a, 

 ciliated pad : b, group of digitiform processes on 

 the notopod. The dotted structures are the mem- 

 branous lips of the neuropod. 



