Bibliographical Notice. 479 



A single male example from Holothurla Bank (China Sea), 

 24 fath. 



Judging by its size the example here described is yoang, 

 and it is necessary to bear in mind that it may prove to be 

 tlie young of G. cultrifer. Since, however, it appears to have 

 all the characters of an adult, I have decided, at all events 

 provisionally, to regard it as a distinct form. It may be at 

 once recognized from G. cultrifer by the presence of tliree^ 

 and not two, teeth on the hand of the raptorial limb, and by 

 the lowness of the median crest of the telson. 



EXPLANATION OF PLATE XX. B. 



Fig. 1. Go)iodactylus Smithii, sp. n. ; last abdominal tergite and telsou 



from above, X 2. 1 a. Ditto, ditto, from the side, X 2. 

 Fiy. 2. Gonodactylm tuberosus, sp. n. ; last abdominal tergite and telson 



from above, X |. 2 a. Ditto, ditto, from the side, X |. '2 b. 



Ditto, rostrum. 

 Fig. 3. Gonodactylus Hansenii, sp. n. ; anterior end of body. 3 ci. Ditto, 



last abdominal tergite and telson, from above, X 2. 3&. Ditto, 



ditto, from the side. 

 Fig. A. Go)iodiccti/lus carin>yer,si^. n.; anterior end of body. 4 a. Ditto, 



last abdominal tergite and telson, from above. 4 b. Ditto, ditto, 



from the side ; nat. size. 



BIBLIOGRAPHICAL NOTICE. 



elements de PaUontologie. Par Fklix Bernaed &c. Premiere 

 Partie (pages 1 a 528), avec 2G6 figures dans le Texte. 8vo. 

 Bailliere, Paris, 1893. 



Paleontology is here treated in a very full and masterly manner. 

 The object and history of the Science are first noticed. Its rela- 

 tionship to Biology and Geology is clearly defined, and the necessity 

 of a knowledge of these, as collateral studies, is insisted on. Its 

 history extends from the ancient recognition of fossil shells having 

 once been marine, to tlie sj'stems of modern philosophy, compre- 

 hending far-advanced theories of natural history in its many 

 branches, and the now-established doctrine of Evolution. Chapter II. 

 deals with tbe definition of " Species," gradations of varieties, and 

 transitional forms ; also how far natural selection and the influence 

 of locality and requirements have had effect. Correlation of struc- 

 ture and rudimentary organs are considered ; and parallelism and 

 convergence among forms, also aberrant and synthetic types, are 

 carefully exemj)lified. How far there may be a vital force in species 

 and in larger groups, and whether the perfection of races and indi- 

 \iduals may be looked for, are among the problems still waiting for 

 elucidation by the study of facts. In Chapters III. and IV. the 

 Author defines natural classification and phylogeny, referring to the 

 help of comparative anatomy in the study of the evolution of organs, 



