REMARKS ON THE AFFINITIES OF RHABDOPLEURA. 



79 



B'is.S. 



Ftff-4i 



Explanation of the woodcuts, being a series of Acephalous Molluscs. 

 M. Mouth. A. Anus. Ac. Blind ending of intestine. F. Foot. 

 G. Gill-tentacles. H. So-called heart of Terebratula. ng. Nerve- 



ganglion. Ov. Oviduct. 



Fig. 1. — Hippocrepian Polyzoon. Fig. 2. — Rhabdopleura. 



„ 3. — Terebratula. „ 4, — Young Ci/clas. 



„ 5. — Dentalium, 



