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Figure 18. — Idarcturus hedgpethi, new species: a, Distal joints of first peraeopod; b, first 

 antenna; c, second antenna; d, distal joints of fifth peraeopod; e, distal joints (rami of 

 uropod, inner surface); /, distal joints of second peraeopod. (Magnification as indicated 

 by scales: a, d, and / same as e.) 



and having a posterolateral spine and a lobe above lateral (antero- 

 lateral) spine in addition to the spines present on third somite. 

 Seventh somite similar to sixth but lacking the lobe and posterolateral 

 spine of that somite. 



875202—50 3 



