BihliograjpMcal Notices. 277 partial one, as represented in the coloured figure Avhich shows the black or purplish stripe of that species. As I stated before, Dr. Hallowell says that his specimen of -A^. auratus (the one received from Paris) was from Mexico. I would add that I have lately had an opportunity of examin-ing two more specimens of Norops duodecimstriatus^ and that they agree well with Dr. Berthold's description. BIBLIOGRAPHICAL NOTICES. A History of British Hydroid Zoojihytes. By Thomas Hincks, B.A, 2 vols. Van Yoorst, 1869. We regret that circumstances have prevented our before noti-cing this valuable work, which has now been out some months. It is a long looked-for addition to our zoological Hterature, and it comes to us as a welcome guest. Mr. Hincks has for many years laboured patiently and assiduously in the study of that order of animals formerly associated with organisms belonging to wholly different types, under the general term Zoophytes, but now con-sidered to constitute one of three orders included in the class Hy-drozoa of Huxley, and known as Hydroida. A work upon this subject was very greatly needed. Two classes of the animals em-braced in Johnston's ' Zoophytes ' had already been ably handled in more recent publications — the Polyzoa by Mr. Busk *, and the Acti-nozoa by Mr. Gosse f. Meanwhile, however, the class Hydrozoa has remained untreated of. Wonderful strides were being made in our knowledge of the affinities, structure, and marvellous life-history of its members. The discovery of the so-called " alternation of gene-rations," of the sexual differentiation of many species, and of the peculiarities and diversity in the mode of reproduction and evolution of the several famihes and genera, have thrown over the study and investigation of this order of animals a flood of interest which is perhaps scarcely equalled, and certainly not surpassed, in any other group of the animal kingdom. During the last twenty years a host of able naturalists have been adding their contributions to the com-mon store of knowledge of these animals, Sars, Ehrenberg, Krohn, Agassiz (father and son), Loven, Huxley, Alder, Hincks, YanBeneden, AUman, Kolliker, Steenstrup, Dujardin, Gegenbaur, Leuckart, Strethill Wright, Clark, Greene, Claparede, &c. have been among the most active investigators who, in all parts of the world, have been patiently working out those detailed facts upon which alone the generalizations of a true systematic arrangement can be based. ' The History of British Hydroid Zoophytes ' opens with an In-* Catalogue of the Marine Polyzoa in the Collection of the British Museum. By George Busk, F.R.S. 1852-54. t A History of the British Sea-Anemones and Corals. By P. H. Gosse, F.R.S. Van Voorst, 1860.
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