164 U.S. NATIONAL MUSEUM BULLETIN 271 



Bateidae 



Figure 69 



Diagnosis. — Coxa 1 vestigial or absent, remainder of gnathopod 

 1 degraded to a single article; accessory flagellum absent. See Gam- 

 maridae, Eusiridae. 



Description. — Accessory flagellum absent; rostrum conspicuous; 

 back often with carinae; mouthparts basic, lower lip with or without 

 inner lobes; gnathopod 1 and its coxa degraded; gnathopod 2 feeble, 

 subchelate; others of first 3 coxae rounded ventrally; uropod 3 with 

 elongate, lanceolate rami; telson of medium length, longer than 

 peduncle of uropod 3, cleft. 



Relationship. — This is the only family with a degraded first 

 gnathopod except the genus Paranamixis in the Anamixidae but 

 that family is far removed from the Bateidae. Except for gnathopod 

 1, bateids resemble the Eusiridae. 



Bateidae have a grade of structure similar to the Amphilochidae 

 and the two families casually resemble one another in overall 

 appearance. 



Key to the Genera of Bateidae 



1. Back with carinae, palp article 1 of maxilla 1 elongate . . . Carinobatea 

 Back smooth, palp article 1 of maxilla 1 of normal dimensions . . . Batea 



Genera of Bateidae 



Batea Miiller 



Batea Muller, 1865.— Stebbing, 1906. 



Type-species: B. catharinensis Muller, 1865 (monotypy). See 

 Shoemaker, 1926. 



Species: 4, Caribbean, tropical eastern Pacific, littoral. 



Carinobatea Shoemaker 



Carinobatea Shoemaker, 1926. 



Type-species: C. cuspidata Shoemaker, 1926 (original designation). 

 Species: 2, Caribbean, littoral. 



