190 Papers from the Marine Biological Laboratory at Tortugas. 



Rhynchobothrium spccinsum, from cyst in Mycteroperca bonaci. 



78. Cyst, sketch from life; actual length 22 mm. 



79. Same, flattened so as to show blastocyst. cy, cyst ; /. larva ; pg, brown pigment sur- 



rounding bl, the blastory<i. 



Rhynchobothrium sp., from Dasyatis say. 



80. Entire specinu-n, balsam; actual length 0.90 mm. 



Si. View of proboscis at base, partly diagrammatic; diameter, exclusive of hooks, 

 0.017 mm. 



82. Another view of proboscis near base; diameter, exclusive of hooks, 0.014 mm., 



length of longest hooks 0.007 mm - 



Rhynclwbotlirhiin sp., from Clupanodon pseudohispanicus. 



83. Head and neck, balsam; actual diameter of head 0.22 mm. 



84. View of proboscis near base; diameter, exclusive of hooks, 0.017 mm. 



85. 86. Other views of proboscis. 



Nj. Characteristic appearance of margins of proboscis; length of longest hooks 

 o.oio mm. 



