136 Reviews — Obsidian- Bombs — Australia. 



perhaps, enable even those not specially acquainted with fossil 

 Crinoids to understand, to some extent, the importance of Mr. 

 Bather's work in relation to these organisms. The minutely de- 

 tailed descriptions which he has given of the structural characters 

 of the different species, and the abundant and faithful illustrations, 

 render the particular features on which their classification depends 

 easy of recognition, and thus will amply compensate for the brief 

 diagnosis and the artistically (but too frequently erroneously) re- 

 stored figures in Angelin's great work, which have not seldom 

 proved confusing to the more ci'itical students of the present day. 

 We very cordially congratulate the author on the amount and 

 excellence of the work performed during the " vacations " of two 

 years, and the Swedish Academy on their success in getting their 

 almost unrivalled collection of Crinoids made available for the 

 service of science a second time. We cannot, however, conclude 

 this notice without expressing -a feeling of regret that the grand 

 collection of British Silurian and Carboniferous Crinoids in our own 

 Natural History Museum should up to the present remain practically 

 undescribed and unknown to the scientific world. Mr. Bather has, 

 indeed, commenced to desci'ibe them in some papers which have 

 appeared at intervals since 1890 in the Annals and Mag. Nat. Hist., 

 but, when we compai'e the humble scale of these with the elaborate 

 Part I. now before us, the contrast is so striking that we are 

 tempted to enquire why there should not be prepared a " non- 

 vacation " work on the fossil Crinoids in the British Museum, on 

 the same pattern as that which our author has so well carried out 

 for the Swedish Academy by way of a holiday exercise ? The 

 writer of the review on Angelin's Iconographia, which appeared in 

 this Magazine in 1878, commented on the neglect in the treatment 

 of these organisms in our country, but scarcely anything has been 

 done in the interval to remedy it. It is high time that the reproach 

 should be removed, and it is to be hoped that before long our home 

 Crinoids will be as adequately treated as those of Gotland. 



a J. H. 



11. UeBER EIGENTHVJMLICHE ObSIDIAN-BomBEN AUS AtJSTRALIEN. 



Von Hekkn Alfred W. Stelznek in Freiberg i. S. Zeitschr. 

 d. Deutschen geolog. Gesellschaft, Jahrg. 1893, pp. 299 — 319, 

 pi. vi. 



On some peculiar Obsidian-Bombs from Australia. 



THE bombs described by Dr. Stelzner in this paper were found 

 on the surface of the ground at Kangaroo Island, S.W. of 

 Adelaide ; in the region of Macdonnel Eange in Central Australia ; 

 and in the great Yictoria desert between the Everard Range and 

 the Eraser Eange. Similar bombs are also reported to occur in 

 other parts of Australia, more particularly in the North and West ; 

 and Charles Darwin, in the "Volcanic Eocks of the Island of 

 Ascension," describes and figures a fragment of a similar bomb 

 found on the sandy plains between the Darling and the Murray. 



