PARASITIC COPEPODS—CALIGID.E— WILSON. 559 



34. Abdomen half the length of the genital segment or more 3.5. 



34. Ainlomen distinetly less than half the genital segment 40. 



35. Males, genital segment narrow cylindrical, n(j wider than abdomen; fifth 



legs invisible cliorinnni ( Kroyer, 1863). 



35. Females, fifth legs plainly visible dorsally 36. 



35. Females, fifth legs not visible dorsally 37. 



36. Genital segment elongate-ovate; fifth legs close to the base of the abdomen. 



gurnard i, var. (Kroyer, 1863). 

 36. Genital segment broad acorn-shaped; fifth legs at corners; fourth legs reaching 



abdomen center Harms ( Kri'tyer, 1863). 



36. tienital segment acorn-shaped, fourth legs not reaching its center; fifth legs at 



corners Ininjii { Kroyer, 1863 ) . 



37. Genital segment distinctly more than half the carapace 38. 



37. Genital segment half as long as carapace or less 39. 



38. Genital segment oblong; abdomen club-shaped; free segment much longer than 



wide jthipxdiil ( B-Smith, 1898, a). 



38. Genital segment orbicular, wider than long; frontal plates projecting between 



the lunules Innitnluitis ( Kn'jyer, 1863), p. 606. 



38. Genital segment ol)cordate, the same length and width; free segment wider than 



long trachyplerl ( Kroyer, 1863 ) , 



39. Genital segment obovate, sides strongly curved; carapace wider than long. 



rheilodactijU (Kroyer, 1863). 

 39. Genital segment acorn-shaped, sides parallel; carapace elliptical; first antenna^ 



hidden laciistrix (.Steenstrup and Liitken, 1861 j. 



39. Genital segment acorn-shaped; carapace ellii^tical; first antemi;e large, 



prominent rapax ( Milne-Fyd wards, 1840), p. 568. 



39. Genital segment (piadrate; frontal plates wide, lunules large; carapace 



ovate latifyons, new species, p. 587. 



40. (Tcnital segment obccjrdate, posterior lobes large; fourth legs large, stout; fifth 



legs visible iiiinlinvs (Otto, 1828). 



40. (ienital segment fiask-sha])ed, no lobes, fourth legs short, weak; fifth legs invis- 

 ible tdalongie (Kroyer, 1863). 



40. Genital segment rectangular, nuii-h wider than long, no lobes; abdomen ex- 

 tremely short parvus ( B-Smith, 1898, a ). 



41. Abdomen four-jointed; genital segment wedge-shaped and deeply lobed. 



(■onipliicnx (Steenstrup and Liitken, 1861). 



41. Abdomen two-jointed, of varying lengths 42. 



41. Abdomen one-jointed, of varying lengths 54. 



42. Abdomen distinctly longer than the genital segment 43. 



42. Abdomen about the same length as the genital segment 47. 



42. Abdomen consideraby shorter then the genital segment .53. 



43. Males, fifth legs concealed in a dorsal view 44. 



43. Females, fifth legs plainly visible dorsally 45. 



43. Females, fifth legs concealed in dorsal view 46. 



44. (Jenital segment quadrate; first abdomen segment less than half the second. 



hirsulus (B-Smith, 1898, a). 

 44. (ienital segment narrow ovate; first abdomen joint twice as long as the second. 



trlchiuii (Kr(')yer, 1863). 

 45. (ienital segment bmad ovate; fifth and sixth legs both showing in dorsal 



view pelamydis ( Kroyer, .1863), p. 594. 



45. Genital segment acorn-shaped; fifth legs only showing and indistinctly; 

 abdomen twice as long as all the rest of thehody . .inacrurus (Heller, 1865). 

 45. Genital segment rectangular, much wider than long; fifth legs only show- 

 ing trich'mri (Kroyer, 1863). 



