1888.] 



On the Physiology of the Invertehrata. 



325 



Observations, &c. {continued). 



Glasgow: — Mitchell Library. Report. 1887. 8vo. Glasgow 1888. 



The Library. 



Guatemala : — Direccion General de Estadi'stica. Informe. 1887. 



8vo. Guatemala 1888. The Office. 



India: — Geological Survey. Memoirs (Palaeontologia Indica.) 



Ser. 13. Vol. I. Part 7. 4to. Calcutta 1887. 



The Survey. 



June 21, 1888. 



Professor G. G. STOKES, D.C.L., President, in the Chair. 



An Address to the Queen, expressing sympathy with Her Majesty 

 and with her daughter, the Empress of Germany, on the death of the 

 Emperor, was read from the Chair. 



Colonel Alexander Ross Clarke, Professor Alfred George Greenhill, 

 and Professor John Henry Poynting were admitted into the Society. 



The Presents received were laid on the table, and thanks ordered 

 for them. 



The following Papers were read : — 



I. " Further Researches on the Physiology of the Inverte- 

 brate" By A. B. Griffiths, Ph.D., F.R.S. (Edin.), F.C.S. 

 (Lond. and Paris), Principal and Lecturer on Chemistry and 

 Biology, School of Science, Lincoln; Member of the Physico- 

 Chemical Society of St. Petersburg. Communicated by 

 Sir Richard Owen, K.C.B., F.R.S. Received May 25, 1888. 



I. The Renal Organs of the Asteridea. 



The digestive apparatus of Uraster rubens (one of the Asteridea) is 

 briefly described as follows : — The capacious mouth, found upon the 

 under side, leads into a short oesophagus, which opens into a wider 

 sacculated stomach with thin distensible walls. There are five large 

 stomach sacs; each of these is situated in a radial position and passes 

 into the base of the corresponding ray. Each sac or pouch is kept in 

 its place by two retractor muscles fixed to the median ridge of the 

 ray, which lie between the two ampullae or water-sacs. Passing 



