MUSEUM OF COMPARATIVE ZOOLOGY. 287 



Fig. 128. Opliiohrachion uiicinatus, from below ; \. 

 Fig. 129. " " from above ; \. 



Fig. 130. " " arm-joiuts, profile. The arm-hooks have all 



fallen, leaving their little mamelons ; \. 

 Fig. 131. " " an arm-hook ; f. 



Fig. 132. Ophiocreas spinulosus, from below ; \. 

 Fig. 133. " " from above ; \. 



Fig. 131. " " joints near base of arm, profile ; \. 



Fig. 135. " " joints near tip of arm, profile ; f . 



Fig. 136. Astronyx Loveni {yowng), fi'om below; ^-^. 

 Fig. 137. " " from above; -U-- 



Fig. 138. " " arm-joints, profile ; J/. 



