PARASITIC COPEPOD CRUSTACEANS — LEWIS 



131 



Dorsal cephalothoracic grooves distinct, forming irregular H, cross 

 groove of H in posterior half of cephalothorax, joined to anterior 

 longitudinal grooves at anterior end of sclerotized ridge projecting 

 anteriorly from posterior sinus. Anterior longitudinal grooves 



2.0mnn 



Figure 33.— Jlebion echinatus Capart, 1953, female: a, dorsal view; h, region of cephalo- 

 thoracic sinus, dorsal view; c, fourth pedigerous segment, genital segment, abdomen, 

 and caudal ramus, ventral view. 



