338 Appendix to the Proceedings 



valve was closed by a contractile process passing from its un- 

 der surface (fig. 8, c.) to the wall of the tube. I have not been 

 able to come to any conclusion as to the shape of the solid 

 frame-work of this remarkable provision for closing the cell 

 of this animalcule, as it is visible only in profile; but I am 

 disposed to consider the whole apparatus to consist of an oval 

 plate of soft sarcode, supported by an included bar or narrow 

 plate of horn or chitine. It is evident that a rigid oval plate 

 accurately closing the bore of the tube would be immoveable. 

 The animal was generally double, as in the figures. In some 

 specimens the tube was marked with close transverse or cir- 

 cular striae. 



III. 



Observations on British Zoophytes. 1. Coryne gravata. 

 2. Stauridiaproducta. By Thomas Strethill Wright, 

 M.D., &c. 



[Read 22d April 1857.] 



Explanation of Plate. 

 Fig. 3. Medusoid of Campanularia Johnstoni — a ovaries. 



4. Ovary of do., with ova. 



5. Coryne gravata, with medusoids — a peduncle=sperm-sac — b poly\> 



undergoing absorption. 



6. Stauridie of Dujardin (after Gosse). 



7. Stauridia producta single polyp. 



8. End of one of the capitate tentacles of S. producta — a head covered with 



thick prehensile palpocils, and containing thread-cells — b ectoderm, 

 with acuminate palpocils springing from tactile (?) corpuscles — 

 c' central chain of endodermal cells, with vacuolated contents, 

 nucleus, and brown granules. 



9. Thread-cell of S. producta, with thread exserted. 



I. Coryne gravata. (Mihi). (Plate XIX., fig. 5.) 



In the spring of 1856 I noticed, in a rock-pool near North 

 Berwick, a number of small milk-white bodies, apparently 

 floating in irregular lines, at about half an inch from the sur- 

 face of the friable sandstone. When these were transferred to 



