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PROCEEDINGS OF THE NATIONAL MUSEUM vol. ub 



Figure 23. — Norion expansus Nordmann, 1864 (female): a, ventral view of cephalothorax; 

 b, antennule; c, second antenna; d, mandible; e, postoral process;/, maxilla; g, maxilliped; 

 h, third thoracic leg; i, fourth thoracic leg; ;", caudal ramus; k, portion of egg string. 



with six small, conical tubercles projecting from flat inner surface. 

 Entire mandible surrounded by fine, membranous covering (fig. 22,d). 



Postoral process biramous, attached lateral to base of mouth cone, 

 segmentation not visible. Outer ramus lamellate, inner dactyliform; 

 inner ramus with short spine projecting from rounded distal end. 

 Outer ramus about twice length of inner, without processes (fig. 236). 



Maxilla two-segmented, situated lateral and posterior to postoral 

 process. Fu-st segment well developed, slightly longer than second, 

 inner proximal surface projecting as well-developed, lobate, articular 



