15 



the pyramidal cells of the hippocampus and subiculum cornu Ammonis. 

 There is no true corpus callosum (as distinct from a psalterium) in any mono- 

 treme or marsupial. The hook-like appearance of the hippocampal com- 

 missure in sagittal section in marsupials , which led Flower to regard it as 

 corpus callosum, simply corresponds to the shape of the hippocampus, which 

 is coextensive with the lateral ventricle. In platypus only the dorsal limb 

 of the hook is present , because there is only a rudimentary descending horn 

 of the ventricle and hippocampus. In Eutheria only the ventral limb persists, 

 because the upper and anterior part of the hippocampus disappears to allow 

 a corpus callosum to appear in the situation occupied by the dorsal limb of 

 the hippocampal commissure in Metatheria, i.e., ventral to the arcus margi- 

 nalis. The fascia dentata, as a consequence of this, is essentially supra- 

 callosal. A doubt is expressed as to the presence of any structure in the 

 submammalia strictly homologous to the Eutherian corpus callosum. The 

 hypothesis is advanced that the latter structure appears (just as the hippo- 

 campal commissure does somewhat earlier) to supply the demand for a 

 shorter connecting path for the great palliai development — essentially a 

 mammalian feature. — 3) Descriptions of some new Species of Australian 

 Coleoptera. By A. M. Lea. Descriptions are given of forty-nine species 

 from New South Wales, mostly belonging to the Anthicidae . A remarkable 

 Protopalus from the Tweed River is described, and a species of Lagria living 

 in ants' nests. — 4) Botanical. — 5) Synonymy of some Australian and 

 Tasmanian Mollusca. By John Brazier, F.L.S., C.M.Z.S. The Synonymy 

 of twelve species is given with references and habitats — Columbella atte- 

 nuata, Ang, = Terehra Beddomei , Petterd; Natica Beddopiei, R. M. John- 

 ston, = N. effossa , Boog Watson; Terehra [Euryla] Harrisoni^ Ten. -Woods 

 = E. pulchella^ Ad, and Ang. = T. [Euryta) Angasi, Tryon; Triforis sci- 

 tidus, A. Ad, = T. fasciata, Ten.-Woods; Rissoia Siran gei , Braz. = R. 

 lineata, Petterd; R. Jachsoni ^ Braz. = 72. badia, Boog Watson ; R.Petterdi, 

 Braz. = R. pulchella , Petterd (the last three names being pre-occupied) ; 

 R. ßamia, Beddome == R. Sophiae , Braz.; Cyclosfrema Weldi , = imma- 

 culata, Ten.-Woods, transferred to the Genus Cirsonella, Ang. = C. auslralis, 

 Aug.; Puncturella Harrisoni , Bedd. = R. Henniana , Braz.; Choristodon 

 rtihiginostitn. Ad. and Ang. = Clementiana Tasmanica, Petterd. — 6) Further 

 Observations upon the anatomy of the integumentary Structures in the 

 Muzzle of Ornithorhynclms. By J. T. Wilson, M.B., Professor of Anatomy, 

 and C, J, Martin, M.B. , B.Sc. , Demonstrator of Physiology, in the Uni- 

 versity of Sydney. The authors specially deal with the details of structure 

 of the »push-rods« in the skin of the snout of the platypus, and offer further 

 confirmation of their views in opposition to a recent criticism of some of 

 these by Professor E. B. Poulton, From evidence afforded by preparations 

 stained by Golgi's silver method, and by means both of methylene blue and 

 chloride of gold impregnations, they re-affirm their former statement that 

 the shafts of the push-rods are traversed by a series of delicate fibrils which 

 are neither more nor less than the end-branchings of the numerous axis 

 cylinders which may be seen to enter the base of the rod. From the methy- 

 lene blue impregnations they further corroborate their former observations 

 upon the »lenticular bodies« in the base of the rod constructed upon a 

 similar principle to that shown in a Grandry's corpuscle. The authors next 

 give an account of the structure of the sweat-ducts and of their associated 



