PLATE II. 



Fig. 



1. Tetrastemma melanocephala, Johnston. 



2. „ Candida, O.F. Miiller. Head elongated. 



3. „ „ Siskin-green variety, with the head contracted, 



4. Prosorhochmus Claparedii, Keferstein, and young. 



5. Nemertes gracilis, Johnst. Enlarged. 



