272 U.S. NATIONAL MUSEUM BULLETIN 23 6 



added, with the result that, at present, it stands as follows: 



Females Males 



Mesochra Macintoshi T. and A. Scott, (M. Macintoshi T. and A. Scott, 1895) 



1895 

 Normanella attenuata A. Scott, 1896 j^^ altenuata A. Scott, 1896 



Lepiomesochra temiiccornis G. O. Sars, 



1911 

 L. confluens G. O. Sars, 1911 L. confluens G. 0. Sars, 1911 



L. infima Monard, 1928 

 L. nasuta Sewell, 1940 



L. africana Kunz, 1951 L. africana Kuna, 1951 



L. enUtoralis Noodt, 1952 L. eulitoralis Noodt, 1952 



L. elongata Bozid, 1955 L. elongata Bozid, 1955 



L. nichollsi Noodt, 1955b L. nichollsi Noodt, 1955b 



( = Leptameira attenuata Nicholls, 1939 not A. Scott) 



The following key may serve to distinguish between the various 

 species; it has been translated from Noodt (1955b, p. 96) and the new 

 species have been added. 



Key to the Species of Lepiomesochra 



1. Segment 2 of exopodite of leg 1 with external marginal spine 3 



Segment 2 of exopodite of leg 2 without external marginal spine .... 2 



2. Exopodite and baso-endopodite of leg 5 fused; 3rd segment of exopodite 



leg 4 with 7 appendages L. nichollsi Noodt 



Exopodite and baso-endopodite of leg 5 separate; 3rd segment of exopodite 

 leg 4 with 5 appendages L. macintoshi (T. and A. Scott) 



3. Segment 3 of exopodite leg 1 with 4 appendages 4 



Segment 3 of exopodite leg 1 with 5 appendages 7 



4. Endopodite of leg 4, 2-segmented 5 



Endopodite of leg 4, 3-segmented L. attenuata (A. Scott) 



5. Segment 3 of exopodites legs 2 to 4 with 2 spines along external margin. 



L. infima Monard 

 Segment 3 of exopodites legs 2 to 4 with 3 spines along external margin . . 6 



6. Rostrum big, segment 2 of endopodite leg 2 with 5 appendages. 



L. nasuta Sewell 

 Rostrum small, segment 2 of endopodite leg 2 with 3 appendages. 



L. confluens G. O. Sars 



7. Endopodite of leg 3, 2-segmented 8 



Endopodite of leg 3, 3-segmented 9 



8. 2nd segment of exopodites legs 3 and 4 with internal seta; total number of 



appendages on 3rd endopodal segment of leg 4 is 5. 



L. pygmaea, new species 



2nd segment of endopodites legs 3 and 4 without internal seta; appendages 



on 3rd endopodal segment of leg 4 number 4 L. africana Kunz 



9. Baso-endopodite of leg 5 with 4 setae L. tenuicornis G. O. Sars 



Baso-endopodite of leg 5 with 3 setae 10 



10. 2nd segment of endopodite leg 2 with 3, 3rd segment of endopodite leg 4 

 with 4 appendages. 7 appendages along margin of exopodite leg 5. 



L. elongata Bo2ic 



