EXPLANATION OF PLATE XIX. 



Fig. 





41. General view of Slavina punjahensis. 



42. Hinder end of Slavina punjahensis, to show the posterior cilia, the 



secretion covering the body, and the entangled foreign particles. 



43. Corpuscles of the body-cavity of Slavina punjahensis. 



44. Relations of the cerebral ganglion of Slavina punjahensis 



45. Cerebral ganglion of Slavina punjahensis, the two halves being of a 



triangular shape. 



46. General view of the anterior part of Stylaria lacustris. 



47. Ventral seta of Stylaria lacustris. 



48. Cerebral ganglion of Stylaria lacustris. 



