562 BULLETIN 159, UNITED STATES NATIONAL MUSEUM 



11. Exopods of first legs 1-segmented; basipods elongate, genicu- 



late, projecting laterally beyond body margins; distal seg- 

 ment of fifth legs linear, 5 setae; muddy sand, 30 fathoms. 



cf 9 Anoplosotna G. O. Sars, 1911 

 Exopods of first legs 3-segmented; basipods not geniculate 12 



12. Spines on first legs short, stout, bluntly pointed; rostrum 



longer than basal segment of first antennae; caudal rami 



close together; tidal pools ? Huntemannia Poppe, 1885 



Spines on first legs slender, elongate, acuminate; rostrum much 

 shorter than basal segment of first antenna; caudal rami 

 widely separated; moderate depths, mud. 



d^ 9 Eurycletodes (part) G. O. Sars, 1909 



13. Both rami of first 4 pairs of legs 1-segniented, of equal length; 



fifth legs 1-segmented, each with 2 apical setae; exopod of 

 second antennae 2-segmented; Antarctic plankton. 



9 Microcryobius Brady, 1910 

 Both rami of first legs 2-segmented, endopod longer than 

 exopod; fifth legs 2-segmented, distal segment very small; 

 exopod of second antenna 1-segmented; littoral in sand. 



d^ 9 Paramesochra T. Scott, 1892 



Both rami of first legs 3-segmented, endopod longer than exopod 14 



Rami of first legs not segmented alike 15 



14. Basipods and basal endopod segment of first legs elongated; 



second endopod 2-segmented, third and fourth endopods 

 1-segmented; segments of fifth legs fused, both sexes; 



on baleen of blue whale cT 9 Balaenophilus Aurivilius, 1879 



Basipods and basal endopod segment of first legs short; second 

 endopod segment elongated; a stout curved spine at each 

 posterior corner of head; littoral (New Zealand). 



9 Meropia, new name for Merope ^^ 



15. Exopods of first legs 3-segmented, endopods 2-segmented, 



longer than exopods; each fifth leg a triangular lamella, with a 

 stout spine and 7 setae; muddy bottom, shallow. 



9 Evansula T. Scott, 1906 (p. 254) 

 Exopods of first legs 1-segmented, of 3 following pairs 3-seg- 

 mented; first endopods 2-segmented, others 1-segmented; 

 fifth legs 2-segmented, basal expansion without setae; beach 

 sands d^ 9 Einertonia, new genus (p. 256) 



16. First legs prehensile, endopods much longer than exopods 17 



First legs natatory, armed only with plumose setae 18 



17. First endopods stout, with 1 strong apical claw; exopod of 



fourth legs 2-segmented; rostrum truncate, with apical fringe 

 of cilia; fifth legs 2-segmented; muddy bottom, shallow. 



9 Harrietella T. Scott, 1906 

 First endopods slender, with 2 weak apical claws; exopod of 

 fourth legs 3-segmented; rostrum pointed, not fringed; 

 fifth legs 1-segmented, 2 spines, 5 setae; muddy bottom, 

 shaUow S Evansula T. Scott, 1906 (p. 254) 



18. Head fused with first segment, produced at its posterior corners 



into long, acuminate, notched spines; similar spines on sides 

 of body; oyster washings (Ceylon). 



9 Laophontella Thompson and Scott, 1903 

 No spines at posterior corners of head or on the body 19 



21 The name Mtrope Thomson had been preoccupied three times. 



