133 
Notes on Oligochaeta 
Dero limosa Leidy 1852. 
Fig. 1. Longitudinal section through segments IY—VI. X 125. 
Fig. 2. Atrium with a little reconstructed anterior end. X 125. 
Tubifex montanus sp. nov. 
Fig. 3; Brain. X 125. 
Fig. 4. Genital organs in longitudinal section (in order to show the running 
of the vas deferens, it is removed from its true place under the atrium and partly 
under the penial mass). X 125- 
Fig. 5. Penis sheath. X 99. 
Tubifex templetoni Southern 1909. 
Fig. 6. Brain of two specimens (a and b). X 125. 
Fig. 7. Atrium of a specimen in a state of early maturity. X 99. 
Fig. 8. Atrium of a specimen in a state of advanced maturity. X 99. 
Fig. 9. Ciliated part of the atrium of a living animal. 
Fig. 10. Penis sLeath. X 232. 
