Revieics — E. Selenka's Zoological Pocket-book. 571 



angulatum, Oitliis hiforata, Athyris Portloelciana, StropJiomena 

 corrugatella, Illanus Liunarssoni, Favosites, Halysites, PtychopliyUum, 

 Spliceronis ohlouga, Eucystis sp., and Caryocystis sp. The Cystidea 

 are numerous and the rock is filled with stem-ossicles which Dr. 

 Holm, after the curious custom of collectors, thinks it necessary to 

 ascribe to Crinoidea. 



Of Caryocrinus only one specimen has been found here. This 

 differs from C. omatus in the following points : the arms ai*e more 

 robust and start lower clown on the radials, giving rise to a zone of 

 protuberances on the cup, the plates of the tegmen are not quite the 

 same, and the anus 1 lies nearer the centre. 



Thus Caryocrinus might appear to have originated in European 

 seas, rather than those where it subsequently flourished ; but the 

 remarkable fact that no specimens have been found in any Silurian 

 rocks of Europe, often so prolific in Pelmatozoa, suggests another 

 hypothesis. The genus may have developed during Ordovician 

 times in an area that is still beneath Atlantic waters ; the few in- 

 dividuals that ventured to Scandinavia may have found those seas 

 unsuited to them, while others at a later date migrating towards 

 America may have been the ancestors of those now preserved so 

 abundantly in the State of New York. F. A. B. 



V. — Revision of a Genus of Fossil Fishes — Dapedius. By 

 Montagu Browne, F.G.S. Trans. Leicester Lit. and Phil. Soc. 

 Vol. II. pp. 19(3-203, PL I. 



THIS is the first instalment of a Memoir on the Liassic Ganoid 

 Dapedius, in which the author proposes especially to revise the 

 species occurring in Britain. After a preliminary review of the 

 literature of the subject, Dapedius dorsalis (Agass.) is discussed in 

 detail, the supposed species, D. monilifer and D. striolatus, being 

 merged with this form, as presenting no satisfactory points of 

 distinction. Dr. Traquair's restoration of the head of Dapedius is 

 copied upon the plate, with the addition of some rough figures of 

 teeth and scales, the latter inadvertently turned upside down. 



VI. — A Zoological Pocket-Book. By Dr. Emil Selenka. Trans- 

 lated by J. R. Ainsworth Davis, B.A. (Charles Griffin & Co., 

 1890.) 



THE plan which forms the basis of this little volume is an 

 admirable one, and students will welcome so concise a com- 

 pendium of Zoological classification. There is a laudable attempt, 

 also, to incorporate some of the more striking results of the palaeon- 

 tological aspect of the subject. The brief definition of each group 

 is accompanied by the names and some particulars of leading 

 types ; and the book is interleaved throughout for MS. notes and 

 memoranda. We can only regret, from our point of view, that 



1 Dr. Holm calls it the mouth ; hut this is probahly due to a too close adherence 

 to Professor J. Hall's description, aud need not be taken as a serious expression of 

 opinion. 



