ROTATORIA OF THE UNITED STATES. 
351 
Rattulus capucinus Wierz. & Zaeh. 
59. Side view of anterior part of lorica when the head is 
strongly retracted (x 285). 
60. Right side ( 285). 
61. Ventral view. The toe extends obliquely toward the 
observer, so that its full length is not seen ( x 285). 
Plate VII. 
Rattulus cylindricus Irnhof. 
62. Prom Lake Bologoe, Russia, left side of retracted 
specimen, bearing egg (x 245). 
63. Left side of extended specimen (from Germany) 
(X 285). 
64. Left side of specimen from East Harbor, Lake Erie 
(X 245). 
Rattulus lat.us Jennings. 
65. Ventral view of extended specimen ( x 350). 
66. Dorsal view of lorica ( x 285 ) . 
Plate VIII. 
Rattulus longiseta Schrank. 
67. Right side view (x 285). 
68. Ventral view of young specimen, retracted ( x 285). 
69. Ventral view of posterior part of body, with toes, 
mucus glands and reservoirs ( X 600) . 
70. Specimen strongly retracted (x 285). 
71. Trophi, from left side (x 665). 
72. Trophi, dorsal view (x 665). 
Rattulus bicuspes Pell. 
73. Left side (X 350) . 
74. Young specimen, right side (X 350). 
75. Dorsal view (X 350). 
76. Trophi, dorsal view (x 665). 
Plate IX. 
Rattulus bicrista, Uis Gosse. 
77. Right side (x 350). 
78. Dorsal view, to show furrow and ridges (x 285). 
79. Posterior part, of body, foot, and base of toes, showing 
the mucus reservoirs and substyles (x 665). (The 
guide line from m. r. should extend farther to the 
left, to reach the reservoirs.) 
80. Trophi, flattened by pressure. 
Rattulus pusillus Lauterborn. 
81. With head partly retracted, from Wehrle’s Pond, 
Middle, Bass Island, Lake Erie ( > 350). 
82. With head extended, from same locality as the last 
(X 350). 
83. Dorsal view (x 665). 
84. Side view ( x 665 ) . 
85. From Han well, England (x 350). 
Plate X. 
Rattulus mucosus Stokes. 
86. Dorso-dextral view of lorica, to show ridges ( x 350). 
87. Side view ( x 350). 
88. Side view of contracted specimen (x 350). 
89. Ventral view of lorica (x 350). 
90. Young specimen ( 350). 
91. Trophi, dorsal view (x 665). 
Rattulus stylatus Gosse. 
92. Ventral view ( x 285). 
93. Left side (X 285). 
94. Dorso-sinistral view (x 350). 
Plate XI. 
Rattulus carinatus Lamarck. 
95. Dorsal view ( x 350) . 
96. Foot and toes, dorso-sinistral view (X 600). 
97. Right side (x 350). 
Rattulus lophoessus Gosse. 
98. Right side (X 285). 
99. Dorsal view (x 285). 
Rattulus rattus Muller. 
100. Dorsal view (x 350). 
101. Left side (x 350). 
Plate XII. 
Rattulus elongatus Gosse. 
102. Retracted, from East Harbor, Lake Erie, dorsal view 
(x 285). 
103. Extended, from England, dorsal view ( x 190). 
104. Ventral view of anterior end with head extended 
(x 190). 
105. Leftside (x 285). 
106. Dorso-sinistral view of foot and toes (x 350). 
107. Trophi, ventral view (x 600). 
Plate XIII. 
The figures on this plate, except fig. 109, were drawn 
by Mr. F. R. Dixon-Nuttall, of Eccleston Park, near 
Prescot, England, who kindly placed them at the disposal 
of the author for the present paper. 
Diurella intermedia Stenroos. 
108. Right side (from England). 
109. From Huron River, Mich, (x 350). 
110. Toes pressed out. 
Rattulus scipio Gosse. 
111. From a living specimen. 
112. Toes pressed out. 
Diurella sulca ta Jennings. 
113. Toes pressed out. 
Diurella brachyura Gosse. 
114. Toes pressed out. 
115. Right side. 
Diurella iveberi n. sp. 
116. Left side. 
117. Right side. 
Diurella sulcata Jennings. 
118. Trophi. 
119. Left side. 
Plate XIV. 
Diurella sejunctipes Gosse. 
120. Dorsal view, after Gosse (1889). 
121. Leftside (x 568), after Stenroos (1898). 
Diurella helminthodes Gosse. 
122. After Gosse (1889) . 
Diurella marina, Daday. 
123. After Daday (1889). 
124. Ventral view of anterior edge of lorica, after Daday 
(1889). 
125. Mastax, after Daday (1889). 
126. Anteriorend, strongly contracted, after Daday (1889). 
