T1UN.SACII0NS OF SECTION J). 



761 



wftlt'i" form?, tlie commonest can Ijo traced to the conversion of marine into frcsli- 

 wattr arciis. The earliest Known hicustvine ureas, tiioso ot'the OUl Ifeil Sandstor.i', 

 liftvo yielded a species of ]iond-nmsseI, which has l)een described as Aiiodo/i'u 

 Jnkesi by Forbes. Tlie I'ermd-'l'riassic lakes contributed additional fresh-wuttr 

 forms, such as the Nerilina and ^Jelaniidii) ; other p:enera jimbably arose at Ihis?- 

 time, tlie occurrence of Unio, Physa, Valvata, and Lyniiiea, in the Nearctic, 

 raJKin'ctic, and Oriental regions during (Cretaceous times suggests for them a liig!' 

 antiquity, nossibly reaching into Paln?ozoic times. 



Tii(! laues oi the IV'rtiary ])eriod fui'nished probably the fresb-water geiieiii 

 lilliiil/lj/pfiun and iJir/Kgoid. 



Tluis existing I'resh-water genera arc probably di scended tVom marine firms 

 which became metaiuorphosed in the waters of the Ditvonian, Triassic, .uid 

 Tertiary lakes. 



•i. Oil It Fish sii/ifiiisi'il til hr of Dcep-sca Or'nila, 

 Bij the Rev. I). Honeymax, b.U.L., F.R.S.G. 



'), Oh the Tnipiiini-/ of Young Fish hy tlie Walcr Wcnl, Ultricularia Vulgiiris. 

 Bij Professor Moskley, LL.D., F.U.S. 



Tiie fact that the plant thus preys upon vertebi at a was discovered by Mi'. G. 

 I,'. Sinims, son of a tiadesman in Oxford, and communicated to ' Nature ' in a letter 

 k Professor Moseley, printed in ' Nature' of May '22, lrtS4. There appears to be 

 idom for much interesting further research as to the action of the plant in the 

 process. Professor Moseley found of one batch of young iish placed in a vessel with 

 ,1 quantity of weed a certain re.-,idual number remained untrapjied for seven; 

 wwks. Possibly tlie plant soon loses its power of trapping when left in conline- 

 mt'iit, or is aHected by change of temperature ii the weather. Tim old traps 

 .<efm possibly less active than the young. Possibly young tlsh of certain species 

 nif from their habits less liable to l)e tra])pe(l tluiii others The bodies of the dead 

 intrapped iisli are rapidly reduced to a glairy mass by swarms of infusoria, wbicli 

 IKissibly thus ])repare the prey for the nourishment of the plant, taking the place 

 of actual digestive organs, which Mr. J>arwin showcid to be absent in Utriculaiiic. 



G. Oil ilie Concordance of the Mollusca Inhahiting both sides of the North 

 Atla^itic and the intermediate Heas. By J. Gwvn Jefi'ijeys, LL.D.,. 

 F.E.S.—SeG lieports, p. 531. 



«l«. 



FRIDA Y, A UG UST 29 



The folloAving Eeports and Papers were read : — 



1. Fourth Report of the Committee for the Investigation of the Natural 



History of Timor-Laut. — See Reports, p. 263. 



2. Reijort of the Committee for the Exploration of Kilima-njaro and the 

 adjoining Mountains of Eastern Equatorial Africa. — See Reports, p. 271. 



3. Report of the Committee for arranging for the occupation of a Table at 

 the Zoological Station at Naples. — See Reports, p. 252. 



4. Report on the Record of Zoological Literature. 



