Royal Society. 273 Anodonta 1. cygnea. /3. stagnalis. y. anatinus. B. avonenis. Damalis 1. margaritifera. Pectunculidce. Pectunculus 1 . pilosus. Aviculadce. Avicula 1 . ? Pinnadce. Pinna 1. fragili9. 2. elegans. Mytilus 1. edulis. 2. pellucidus. 3. elegans. Modiola 1. papuana. 2. Gibbsii. 3. Prideauxii. 4. discrepans. 5. discors. Pectenida. Lima 1. Goodallii. 2. bisulcata. N.B. The names of the bivalves were copied by Mr. Stevens from a catalogue prepared at another time, and hence the difference in the position of the numbers. Pecten 1. maximus. 2. vulgaris. 3. varians. 4. distortus. 5. obsoletus. 6. (lsevis). Ostreada. Ostrea 1. edulis. Anomia 1. striata. 2. cymbiformis. 3. ephippium. Terebratuladce. Terebratula 1. cranium. 2 ? Incerta sedes. Mya ferruginea. insequivalvis. bidentata. Solen squamosus. pinna. Mactra triangularis. PROCEEDINGS OF LEARNED SOCIETIES. ROYAL SOCIETY. June 17, 1847. — "On the Structure and Development of the Liver." By C. Handfield Jones, M.B., Cantab. Communicated by Sir Benjamin C. Brodie, Bart., F.R.S., &c. The author gives a detailed description of the structure of the liver in animals belonging to various classes of the animal kingdom. He states that in the Bryozoon, a highly organized polype, it is clearly of the follicular type ; and that in the Asterias, the function of the liver is probably snared between the closed appendage of the stomach and the terminal caeca of the large ramifying prolongations of the digestive sac contained in the several rays. Among the Annulosa, the earthworm presents an arrangement of the elements of the he-patic organ, corresponding in simplicity with the general configura-tion of the body, a single layer of large biliary cells being applied as a kind of coating over the greater part of the intestinal canal. In another member of the same class, the Leech, in which the digest-ive cavity is much less simple, and presents a number of sacculi on each side, these elements have a very different disposition; and
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