504 PROCEEDINGS OF THE NATIONAL MUSEUM 



Figure 14. — Elasmopus rapax Costa, male, 3.2 mm., Abbott sta. 42-F-2: gnathopod 2. 

 medial view. 



Elasmopus spinidactylus Chevreux 



Elasmopus spinidactylus Chevreux, 1907, pp. 413-414; 1908, pp. 486-489, fig. 9. — 

 Walker, 1909, pp. 336-337.— Schellenberg, 1938a, p. 55.— Shoemaker, 1942, 

 p. 13.— RufFo, 1954, p. 119. 



Material: Abbott stations 13-C-l (8), 14-B-3 (14), 18-E-4 (1), 

 24-C-l (9), 29-C-l (3); Reish stations E-26 (5), E-73 (13), E-76 (l), 

 E-77 (10), E-93 (8), E-94 (11), E-95 (6), E-96 (1), BE-101 (35), 

 BE-108 (2), BE-112 (20) BE-113 (21), E-128 (6). 



Distribution: Gambier and Tuamotu Archipelagos; Chagos Islands; 

 Clipperton Island; Venezuela; Ifaluk Atoll, Caroline Islands; Bikini 

 and Eniwetok Atolls, Marshall Islands. 



LiagoceradocuSf new genus 



Diagnosis: Telson deeply cleft; accessory flageUum 2-articulate; 

 pereonal and pleonal segments neither dorsally carinate nor toothed, 

 nor spinose; rami of uropod 3 much longer than peduncle, not folia- 

 ceous, subequal in length, outer ramus biarticulate ; inner edges of 

 inner plates of both maxillae lined with setae; lower lip lacking inner 

 lobes; palp article 3 of mandible longer than article 1, slightly sub- 

 falcate, lined on inner edge with 6 strong spine-setae; gnathopod 1 

 subchelate, palm nearly transverse, gnathopod 2 subchelate but palm 

 indistinct from the hindmargin of article 6. 



Type species : Liagoceradocus pusillu.s, new species. 



Relationship: This genus differs from Anelasmopus Oliveira (1953) 

 and Pherusa Leach (a homonym requuing a new name) by the long 

 rami of lu-opod 3, of which the outer is biarticulate. It differs 



