Fig. 8(). Echinarachnnis Parma Lamck. The dental system, side view, the 

 pyramids 8 and 4, and the greater part of the 5 a being removed. 

 The mouth and pliarynx and the oesophagus cut througli, showing 

 the bands by wliicli the pharynx is snspended, and the pharyngeal 

 muscles. 



Fig. 87. The pyramid 4, dorsal view. 



Fig. 88. The pyramid 5, veutral view. 



Fig. 89. The half-pyramid 4 a, alvcolar view. the tooth drawn as if trans- 

 parent. 



Fig. !)0. The half-pyramid 3 «, lateral view, the inter-muscular sheet being 

 removed to show the lamels and tlie triangulär area. 



Fig. 91,9-i. The rotul» I and III. 



Fig. 93. Part of the peristome, amb. II, I and V, interradia 2, 1, ö, witli 

 the auricles and the external motor muscles. 



Fig. 94. Lagnnnvi decngonale Bi,v. The dental system, side view, the 

 pyramids' 3 and 4 and the greater part of the 5 having been re- 

 moved. The moutli cavity, tlie pharynx and the oesophagus cut 

 through. 



The pyramid 4, dorsal view. 

 The same pyramid, ventral view. 

 The pyramid 5, ventral view. 



The half-pyramid 4 n, alveolar view, the tooth drawn as if trans- 

 parent. 



Fig. 99. The half-pyramid 3 a, the inter-muscular sheet removed to show 

 the lamels and the triangulär area. 



Fig. 100. The processus supra-alveolaris with the epiphyses and no rotula. 



Fig. 101. Part of the peristome. inside view, as above fig. 93. 



Fig. 102. Echinocyamits angulosiis Leske. The dental system, side view, 

 the pyramids 3 and 4 and the greater part of the 5 a being re- 

 moved. 



Fig. 103. The pj'ramid 4 upper surface. 



Fig. 104. The same, lower surface; + and X referring to fig. 107. 



Fig. 105. The pyramid 5, lower surface. 



Fig. 106. The half-pj^ramid 4 a, alveolar view. 



Fig. 107. Part of the outer wings, upper side, + and X referring to fig. 104. 



Fig. 108. A rotula. 



Fig. 109. Part of the peristome, internal view, as above, fig. 93. 101. 



