Bull. U. S. F. C. 1899. (To face page 304.) 
Plate 41 . 
Gastcrostomum areuatum sp. nor. from Sonin nirtla. 
| 85. Lateral view of small specimen, x about 70. 
j o(i. Lateral view of larger specimen. . 70. m. Month. 
at. Ventral view, diagrammatic, x 50. m, Mouth. 
88. Anterior end. x 200. 
Flat, scale-like spines from neck. 450. 
JO. Median longitudinal vertical section, x 180. 
vi, Mouth; a, ventral sucker (pharynx). 
Gastcrostomum up. from Tylosurus martinis. 
j 91. Lateral view, x 70. m, Mouth. 
Calyptrobothriv m occi dent-ale sp. nov. from. Tetranarrc acrid entails. 
92. Head and neck of small specimen, life. (18. 
93. Front view of same, alcoholic. < 24. 
94. Head of large specimen, alcoholic, x 24. 
95. Single bothrium (see tig. 92), life. X 08. 
96. Posterior segments of small specimen, life. - 08. 
97. Transverse section of one of the posterior segments of large speci- 
men. x 80. 
Iv, Longitudinal vessel. 
