Notices of Memoirs — SJiort Notices. 523 



definite judgement was possible, before the Arachnida figured and 

 described by Corda and Kusta from the Bohemian Carboniferous 

 had been re-examined. Towards the conclusion of the work 

 mentioned above, I took this in hand and prepared a work with 

 many plates and restorations, which work will perhaps appear 

 before the end of the year. I came to the following results, 

 which are here noted since they interest a wide circle. 



Ci/dophthalmus senior, Corda, has no circle from the lateral to the 

 large middle eyes, but there are merely angular granules on the 

 median keel, as one sees in recent Buthid^. 



The restored figures of the eyes of Cyclophthalmus, which Corda 

 gives on p. 37, as well as those of recent Androctonus, are fanciful 

 and have no basis in fact. 



Such position of the eyes as Corda figures for Androctonus exist 

 in no known scorpion, and must have arisen from his mistaking the 

 granules of the median keel for eyes. 



Cycloplithalmus has merely two large median eyes, and, anteriorly 

 on each edge, three lateral eyes, as in the recent Butlms. I have 

 observed the latter in two species. 



The Anthracomarta belong to the Trogulid^, and it was necessary 

 to settle which of the portions represented in the impressions belongs 

 to the upper and which to the under sides. Eoplirynus comes near 

 to Trogulus, and has nothing to do with Phrynus. 



The various genera of spiders which Kusta has described belong 

 to the Arthrolycosidse, which are the forerunners of the Mygalid^. 



The spider from Nyran (Promygale) shows by the possession of 

 marginal plates a connecting link between the Trogulidae and the 

 Arthrolycosidge. — A. Fritsch, Zool. Anzeiger, xxv, 16 June, 1902. 



3. First Steps in Photo-microgeaphy, By F. Martin Duncan, 

 F.R.H.S. (the Amateur Photographer's Library, No. 25). Crown 8vo ; 

 pp. 104, with 16 text figures. (London : Hazell, Watson, & Viney, 

 Ltd., 1902. Price Is. nett.) 



In this little work the author describes the methods and apparatus 

 for use in low- and high-power photo-micrography ; also develop- 

 ment, printing, and lantern-slide making. The work is manifestly 

 the result of the author's own practical experience, aud will be 

 of great service to geologists who desire to produce their own 

 photographs and to make lantern-slides of minute objects. 



4. AcROTHYBA AND Hyolithes: A COMPARISON. By G. F. Matthew, 

 D.Sc. Trans. Roy. Soc. Canada, ser. ii, vol. vii, sec. iv, p. 93. 



Having described a new genus of Brachiopods from the Basal 

 Cambrian rocks of Cape Breton, Dr. Matthew proceeds to compare it 

 with the genus Hyolithes, in which he finds analogous conditions of 

 growth and musculation. Acrothyra, the new Brachiopod, is very 

 like in form to the obtuse tubes of certain Hyolithes, and appears to 

 have lived under somewhat similar conditions. 



A close comparison of the muscular systems in these two forms 

 shows some points of resemblance, and others of radical difference ; 

 the two forms, therefore, are not supposed to be very closely related, 

 but to be independent types, separately developed from the Worms. 



