154 U.S. NATIONAL MUSEUM BULLETIN 271 



present; male gnathopod 1 with long posterior tooth on article 5, 

 article 6 longer and as broad as 5, subchelate; male gnathopod 2 

 heavily setose on anterior edge of article 5, articles 5-6 subequal; 

 rami of uropod 3 equal, longer than peduncle. Species: 1, Gulf of 

 Mexico, littoral. 



Lembos Bate 



Lembos Bate, 1857a. — Stebbing, 1906. 

 Autonoe Bruzelius, 1859. 

 Bemlos Shoemaker, 1925. 



Type- species : L. websteri Bate, 1857a (designated by Chevreux 

 and Fage, 1925). See Sars, 1895. 



Article 3 of antenna 1 shorter than article 1, accessory flagellum 

 present; male gnathopod 1 subchelate, with articles 4-5 lacking teeth, 

 article 6 not narrower but usually longer than 5, female gnathopod 1 

 subchelate; male gnathopod 2 subchelate, with article 5 longest, poorly 

 setose on anterior edge; rami of uropod 3 equal, longer than peduncle. 

 Species: 31, cosmopolitan, primarily tropical, littoral (2 bathyal, 1 

 abyssal) . 



Leptocheirus Zaddach 



Leptocheirus Zaddach, 1844. — Stebbing, 1906. 

 Ptilocheirus Stimpson, 1853. 

 Boeckia Malm, 1871. 



Type-species: L. pilosus Zaddach, 1844 (original designation). See 

 Sexton, 1911; Chevreux and Fage, 1925. 



Article 3 of antenna 1 shorter than article 1, accessory flagellum 

 3 -{--articulate; male gnathopod 1 subchelate, articles 4-5 lacking 

 teeth; female gnathopod 1 subchelate and extremely setose; gnathopod 

 2 simple in both sexes and extremely setose on articles 2 and 5 but 

 article 5 not especially bulbous; rami of uropod 3 equal or unequal, 

 one or both rami longer than peduncle; coxa 1 often very small and 

 occasionally large but always slightly smaller than coxa 2 and often tri- 

 angular, hidden fully or partially by enlarged coxa 2, latter longer than 

 wide (Xenocheira) . Species: 10, boreal N. Atlantic, littoral. 



Microdeutopus Costa 



Microdeutopus Costa, 1853c. — Stebbing, 1906. 



Stimpsonia Bate and Westwood, 1863 (homonym, Nemertea). 



Stimpsonella Delia Valle, 1893. 



Type-species: M. grylloialpa Costa, 1853c (monotypy). See Sars, 

 1895. 



Article 3 of antenna 1 shorter than article 1, accessory flagellum 

 present; male gnathopod 1 with long distal tooth on article 5, article 



