720 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxi. 



Plate XVII. — Gloiopolea ornatus AVilsou. 



Fig. 23. Dorsal view of female. 



24. Second antenna. 



25. Firs^t maxilla. 



26. Second maxilla. 



27. First maxilliped. 



28. Second maxilliped. 



29. Furca. 



30-34. First, second, third, and fourth swimming legs. 

 31. Three-parted spine on the first leg, magnified. 



Plate XVIII. — Alehion fp'ucUis Wilson. 



Fig. 35. Dorsal view of female. 



36. Dorsal view of male. 



37. Second antenna of female. 



38. Second antenna of male. 



39. Second antennae, mouth tube, and second maxill?e of female, showing rela- 



tion of the parts. 



40. Dorsal view of mouth tube, enlarged. 



41. Ventral view of tip of same, showing opening. 



42. Mandible. 



43. First maxilliped. 



44. Second maxilliped. 



45-47. First, second, and third swinniiing legs. 

 48. Ventral view of genital- segment of female. 



Plate XIX. — Alehion glaber Wilson. 



Fig. 49. Dorsal view of male. 



50. Dorsal view of female. 



51. Second antenna of female. 



52. Mouth tube, second maxillfe, and chitin j^ads. 



53. First maxilliped. 



54. Second maxilliped. 



55-58. First, second, third, and fourth swinniiing legs. 



59. Rudimentary fifth legs, greatly enlai'ged. 



60. Ventral view of genital segment of female with spermatophores in place. 



61. Ventral surface of genital segment of male, showing rudiments of lioth fifth 



and sixth swimming legs, and a partial separation of the sixth thorax 

 segment. 



Plate XX. — Diisgainus ariommus, new species; and Dissonus spinifer Wilson. 



Fig. 62. Dorsal view of male of Di/ftgnmus ariommus. 



63. Second antenna. 



64. Mouth tube and second maxilhe. 



65. Second maxilliped. 



66. Furca. 



67-70. First, second, third, and fourth swimming legs. 



71. Dorsal view of female of Dissonus .'ipinifer. 



72. Dorsal view of male. 



