150 
found in P. Mentula , P. Oblonga , and those other species which 
are allied to P. Virginea. 
Another observation made by Mr Murray in relation to this matter, 
and one which promises to furnish interesting results, was, that 
in none of the mollusca (and indeed in none of the invertebrate 
animals) on which his experiments had been made, was the food 
digested by gastric acid. He had never found acid in the stomach. 
The mode of digestion in the invertebrata would appear therefore to 
be probably conducted on a different system from that in the verte- 
brata. 
Incidentally Mr Murray alluded to the Notodelphs and small 
Crustacea found in the stomachs of Ascidiae. He differed from those 
authors who thought them parasitic, as he had found many dead, and 
in all stages of apparent digestion, in the respiratory sac of Phallusia 
Virginea. 
With regard to the homology of the parts in question, he pointed 
out that the facts he had brought forward all tended to show that 
the sac is homological with the pharynx rather than with the ten- 
tacular crown of the Polyzoa. 
The following Donations to the Library were announced - 
Quarterly Journal of the Chirurgical Society, No. XLIIL 8vo.— ~ 
From the Society . 
Bulletin de la Societe Imperiale des Naturalistes des Moscou. 
1857, Nos. II., III., and IV. 1858, No. I. 8vo.-— From 
the Society. 
Transactions of the Pathological Society of London. Vol. IX. 
8 vo. — From the Society. 
Schriften der Universitat zu Kiel. 1856, Band III. 1857, Band 
IV. 4to.- — From the University . 
Journal of the Statistical Society of London. Vol. XXI. Part 
IV. Dec. 1858. 8vo.— From the Society. 
Memoirs of the Literary and Philosophical Society of Manchester. 
Vol. XV. Part I. 8vo. — From the Society. 
Proceedings of the Literary and Philosophical Society. 8vo. Nos. 
1 to 14. 8vo.“— From the same. 
Eight Maps of Hindostan. Nos. 24, 38, 54, 73, 102, 103, 111, 
and 112.- — From the East India House. 
