18738.] 349 [Morse. 
Segmental organs of Worms 
Fig. 20. Lumbricus. Fig. 21. Pectinaria. Fig.22. Eunice. Fig. 23. Stylodri- 
lus. Fig. 24. Nereis. se. segmentalorgan. g. genitalia. v. vascular channel. 
i. intestine. Fig. 20 is from Lankester, the rest from Claparéde. 
Fig. 26. Fig. 27. Vig. 23. 
Segmental organs of Brachiopods. 
Fig. 25. Discina. Fig. 26. Lingula. Fig. 27. Rhynchoneila. Fig. 23. Terebrat- 
ulina. These figures are from my own studies. 
