599 



authors, carried on for many years, are to bring these little-known species 

 into relationship with the constituents of neighbouring local faunas. The 

 authors have had access to very nearly all of the local types, and their know- 

 ledge of the Australian fauna imparts to their interpretation of the Tas- 

 manian species a value which may be accepted as correct in the main. The 

 unfigured species, including about 30 new forms, number 120 or there- 

 abouts, which are illustrated. Two new genera are established, Petterdella^ 

 based on Stilifer Tasmanica^ T.-Wds., which has the general form and 

 aperture of Hissoina and the heterostrophe nucleus of Eulimella\ and Thraci- 

 opsis (nomen mutandum) = Alicia, Angas noii Johnston (1861). A new 

 species of a previously unknown genus in Australia, Ci/amium, is described. 

 Among some of the several changes in generic location is the transference 

 of Cominella tenuicostata to Phos in a sectional group belonging to the Older 

 Tertiaries of Australia. This is not the only instance of the survival of an 

 Eocene genus in an unique species in the waters of Southern Australia and 

 Tasmania. The number of species in the Census of Tenison-Woods has 

 been considerably reduced, but many extralimital species have been added. 

 The total number is 676, grouped as follows: — 



Cephalopoda 10 



Gastropoda 503 



Scaphopoda 4 



Lamellibranchiata 156 



Palliobranchiata 3 



676 



Mr. R. Helms exhibited a remarkable spider [Dic7-ostichus sp.) from 

 Rose Bay, together with its nest and egg-bags. — The subjoined abstract of 

 a paper read at last Meeting was received too late for insertion in last 

 month's Abstract: — 



1) Note on the Occurrence of Radiolaria and Diatoms in the Lower 

 Cretaceous Rocks of Queensland. By W. H. Rands, F.G.S., W. S. Dun, 

 and Prof. David, B.A., F.R.S. — The authors, after a brief review of the 

 literature dealing with the above organisms fossil in Australia, describe their 

 mode of occurrence , as recently determined in the Maranoa Limestone of 

 Queensland. The collection of macroscopic fossils as recorded by Messrs. 

 R. L. Jack and R. Ethe ridge, Junr., in association with the above lime- 

 stone proves its age to be probably Lower Cretaceous, the well known 

 Queensland form Maccoyella Barklyi, Moore, being specially characteristic. 

 The limestone is very fine-grained, and somewhat siliceous, and weathers 

 superficially into a brov/nish friable material like Bath brick, whereas the 

 unweathered portions are bluish-grey. As regards the Radiolaria (which are 

 Spumellarian mostly), few, if any, spine-bearing forms are preserved, a fact 

 which has already been commented on by Dr. G. G. Hin de, F.R.S., in his 

 description of the Upper Cretaceous (?) Radiolarian rocks from Fanny Bay, 

 Port Darwin. The forms of Radiolaria and Diatoms in the Maranoa Lime- 

 stone have been studied by the authors partly by making thin sections of the 

 rock, and partly by etching the organisms out with dilute acetic acid. 



As regards the Diatoms, only one variety is present which can with 

 certainty be assigned to this order. This form, which is rather plentiful, is 

 almost certainly one of the Nitzschiaceae or of the Naviculaceae. Another 



