COPEPOD GENUS DENTIGRYPS — ^LEWIS 



349 



Figure 1. — Hypothetical thoracic leg 

 showing the various armament compo- 

 nents: 



C: heavy fringing setules 



c: light fringing setules 



d: denticulations 



dH: large denticulated spine 



endo: endopodite 



exo: exopodite 



fH: large spine with frill around base 



fh: small spine with frill around base 



H: large spine 



h: small spine 



m: membrane 



mH: large membrane-margined spine 



P: large plumose seta 



p: small plumose seta 



p': small naked seta 



prot.: protopodite 



Q: large seta plumose on one side, mem« 



brane-margined on other 

 rh: spinule 



s: solitary hairlike process 

 sp: sternal plate 

 Numbers: segment numbers 



Cephalothorax strongly compressed dorsoventrally, consisting 

 of cephalosome and four thoracic somites, the first bearing a single 

 pair of maxillipeds, the next three pedigerous. Frontal plates present, 

 flattened, with membrane along anterior margin but without lunules. 

 Lateral cephalothoracic margins with membrane. Lateral posterior 

 surfaces with distinct sinus, median portion of posterior surface forming 

 junction with free fourth pedigerous segment. 



Free fourth pedigerous segment either partially or completely 

 covered dorsally by extension of median portion of posterior cephalo- 

 thoracic surface or bearing some indication of dorsal plates. Dorsal 

 plates, if present, very small, not well developed, not overlapping 

 genital segment. Division between fourth pedigerous and genital 

 segments visible, at least laterally, although often indistinct and in- 

 complete. 



