EXPLANATION OF PLATE XIX. 



Figure 95.— Cosmocepbala ochracea, (p. 630;) anterior portion, enlarged nearly three 



diameters, dorsal view. 

 9oa. — The same; ventral view. 

 96. — Meckelia iugens, (p. 630;) anterior portion of a specimen not full grown, 



natural size. 

 96a. — The same ; ventral view of the anterior portion and head of a larger 



specimen, in a different state of contraction, natural size. 

 97. — Polinia glutinosa, (p. 631;) dorsal view, enlarged two diameters. 

 98. — Tetrastemma arenicola, (p. 629;) dorsal view. 

 99. — Stylochopsis littoralis, (p. 632 ;) dorsal view. 

 100. — Planocera nebulosa, (p. 632;) dorsal view. 



(All the figures were drawn from liviug specimens, by A. E. Yerrill.) 



