PARASITIC COPEPOD CRUSTACEANS — LEWIS 



135 



medially and sharply curved so that distal surface at right angles to 

 proximal. Third segment and terminal process continuous, forming 

 strongly developed, heavily sclerotized claw bearing 2 small accessory 

 processes; first process a spinule from knob in proximal region, second 

 a slender setule from middle of combined segment and terminal 

 process. Mandible (fig. 34c) 4-parted, distal part short, curved in- 

 ward slightly, with 12 minute denticulations along inner surface. 

 Postantennal process (fig. 346) a suborbicular adhesion pad and 3 

 nodules, each bearing several hairlike processes, pad situated lateral 

 to base of antenna. Postoral process (fig. 346) situated lateral to 



Table 14. — Armature of thoracic legs I-IV of the female of Alebion echinatus 



C apart, 1953 



* Small, bilobed membranous process presumably modified from hairlike processes normal to members of 



the genus. 

 •• Only marginal armature included. 

 *** The origin of the armature elements is presumed to be the exopodite, 



mouth cone, consisting of 2 parts. Posteriormost part a broad, 

 heavily sclerotized, subtriangular projection, anterior part a node 

 bearing 2 slight swellings distally, each with flabby, setule-Hke process. 

 Maxilla (fig. 34(:Z) 2-segmented, situated posterior and lateral to post- 

 oral process, both segments of about equal length although first more 

 strongly developed, broader proximally than distally. Second seg- 

 ment narrow proximally, broader distally, with row of spinides on 

 posterior distal surface, long, whiplike terminal process with frUled 

 margins and short, dagger-like terminal process, also with frilled 

 margins. 



Maxilliped (fig. 34c?) 2-segmented, situated posterior and medial 

 to maxilla base. First segment strongly developed, slightly less than 

 twice the length of second segment and terminal process, with narrow 

 proximal end, small concavity of inner medial surface, and small, 

 knoblike adhesion process just distal to concavity. Second segment 

 short and chunky, divided, by regions of sclerotization, from bifurcate 



