90 Papers from the Marine Biological Laboratory at Tortugas. 



Plate 8. 

 Hamacreadium oscitans, continued. 



Fig. 62. Ventral view, life, details added; length 1.50 mm; from Lachnolaimus 

 maximus. 



Fig. 63. Ventral view, life, details added; length 1.12 mm. Ovary not dis- 

 tinctly seen. Cirrus-pouch turned to the left by the contraction 

 of the neck. From Anisotremus virginicus. 



Fig. 63a. Ovum; length 0.043 mm. 



Megasolena estrix gen. et sp. nov., from Kyphosus sectatrix. 

 Fig. 64. Ventral view, life; length 3 mm. 



Didymorchis latus gen. et sp. nov., from Calamus calamus. 



Fig. 65. Ventral view, life, details added; length 2.03 mm. 

 Fig. 650. Ventral sucker, balsam. 



Enenterum aureum gen. et sp. nov. from Kyphosus sectatrix. 



Fig. 66. Ventral view, life, details added; length 5 mm. 



Fig. 67. Front-ventral view of head showing arrangement of lobes, life ; 



diameter 0.5 mm. 

 Fig. 68. Horizontal section showing cirrus, prostate, seminal vesicle, and 



metraterm. 



Plate 9. 

 Enenterum aureum gen. et sp. nov. 



Fig. 69. Horizontal section. One section of the series intervenes between this 



and the previous figure. 

 Fig. 70. Cirrus-pouch and metraterm, balsam, ventral view; diameter of 



ventral sucker 0.5 mm., compressed. 



Lepocreadium trulla (Linton) from Ocyurus chrysurus. 



Fig. 71. Dorsal view, balsam; length 1.12 mm. The spines are evanescent. 

 Fig. 72. Ventral view, life, somewhat distorted by pressure; length 1.22 mm. 

 Fig. 73. Excretory pore at posterior end of body. 

 Fig. 74. Spines, length 0.006 mm. 



Lepocreadium levenseni (Linton). 



Fig. 75. Ventral view, life, details added; length 1.68 mm. Oral sucker 



invaginated. From Epinephelus morio. 

 Fig. 76. Muscular bulb of excretory vessel at posterior end of body; diameter 



of bulb 0.04 mm. 

 Fig. 77. Ventral view of specimen from Mycteroperca venenosa, life; length 



2.75 mm. 



Plate 10. 

 Stephanochasmus casus sp. nov. 



Fig. 78. Ventral view, life, details added; length 3.3 mm. Spines evanes- 

 cent. From Neomcenis griseus. 



Fig. 79. Horizontal section; length 2.1 mm. 



Fig. 80. Ovum, life; length 0.068 mm. 



Fig. 81. Transverse section of ovum, showing characteristic contraction 

 character; diameter 0.031 mm. 



Fig. 82. Nearly horizontal section of cirrus-pouch showing seminal vesicle 

 and cells of prostate. 



Fig. 83. Nearly horizontal section of young specimen from Ocyurus chrysurus; 

 diameter of section at ventral sucker 0.41 mm. 



Stephanochasmus sentus sp. nov. 



Fig. 84. Dorso-lateral view, life, details added; length 3.15 mm. Spines 

 evanescent. Peculiar papillate character of neck due to degener- 

 ation changes following falling off of spines. From Hcemulon 



