CRUSTACEA MALACOSTRACA. III. 109 



a. Abdomen with produced and acute postero-lateral angles. Fifth joint of first pair of legs with 

 four spines along the lower margin, and a minute spine close above the very long spine from 

 the distal angle 9. D. armatum G. O. S. 



b. Abdomen posteriorly rounded, without produced postero-lateral angles. Fifth joint of first pair 

 of legs with three spines or a single spine on the lower margin, and no spine above the very 

 long spine projecting from the distal angle. 



«. Fifth joint of first pair of legs with three spines on the lower margin, the terminal spine 



included {D. angustum (Hansen, MS.) G. O. Sars) 



j. Fifth joint of first pair of legs with a single spine, the terminal, on the lower margin. 



S- Lower margin of fifth joint of first pair of legs more than twice as long as the deptli of 

 the joint and slightly shorter than sixth joint, which is about four times as long as deep. 

 Fifth thoracic segment in the female much broader at the anterior than at the posterior 

 margin and more than twice as broad as the length of the median line, with the lateral 

 margins convex, and the surface strongly reticulate. Very large species. (D. chelatum 



Stephensen). 

 5jij- Lower margin of fifth joint of first pair of legs a little less than twice as long as the 

 depth of the joint, and slightly shorter than sixth joint, which is almost three times as 

 long as deep. Fifth thoracic segment in the female much broader at the anterior than 

 at the posterior margin, a little more than twice as broad as the length of its median 

 line, with the lateral margins a little concave near the middle, and the surface strongly 



reticulate. Moderately large species 10. D. insigne n. sp. 



§§§. Lower margin of fifth joint of first pair of legs scarcely half as long again as the depth 

 of the joint, and considerably shorter than sixth joint, which is conspicuously less than 

 three times as long as deep. Fifth thoracic segment in the female narrower at the anterior 

 than at the posterior margin, not one-third as broad again as the length of its median 

 line, with the lateral margins scarcely concave at the middle, and the upper surface 

 scarcely reticulate. Small species 11. D. plebejiun n. sp. 



67. Desmosoma globiceps Meinert. 

 (PI. X, figs. 4 a-4b). 



1890. Eugerda globiceps Meinert, "Hauch"s Togter, p. 194; PI. II, figs. 53—62. 

 ! 1899. — G. O. Sars, Account, II, p. 252; Suppl. PI. HI, fig. 1. 



The figures and description published by Sars ma}- be sufficient for the recognition of this 

 species, but a few points may be mentioned here. 



First thoracic segment (fig. 4 a) is very short, only about half as long as the second, with the 

 epimera somewhat produced and terminating in a spine. The anterior part of the epimera of second 

 segment is distinctly produced, triangular, with the end acute or obtuse, terminating in a short seta. 

 — As figured by Sars, the legs of first pair are slender, and fifth joint without setae on the lower 

 margin. Second pair of legs with fifth joint (fig. 4b) very characteristic, compressed, somewhat 



