Bibliographical Notices. 277 



partial one, as represented in tlie eoloured figure wliicli shows 

 the black or purplish stripe of that species. 



As I stated before, Dr. Hallowell says that his specimen of 

 N. aitratus (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 duodecimstriatusy and that 

 they agree well with Dr. Berthold's description. 



BIBLIOGRAPHICAL NOTICES. 



A HistoDj of British Hi/droid Zooplvjtes. By Thomas Hincks, B.A. 

 2 vols. Yaa Voorst, 1S69. 



"We regret that circumstances have prevented our before noti- 

 cing this vahuibic work, which has now been out some months. It 

 is a long looked- for addition to our zoological literature, 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 Ily- 

 drozoa of Huxley, and known as Hydroida. A work upon this 

 subject was very greatlj' 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. AVonderfid 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 certaiidy 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, Khrenberg, Krohn, 

 Agassiz (father and son), Loven, Huxley, Alder, Hincks,Yau Beneden, 

 Allman, Kiillikcr, .Steenstrup, Dujardin, Gcgenbaur, Leuckart, 

 Strcthill AVright, Clark, Greene, Claparede, <S: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 Mnrino Polyzoa in the Collection of the British 

 Museum. By George Busk, F.K.S. 18''52-54. 



t A Historv of the British Sea-Anemones and Corals. Bv P. H. Gosae, 

 F.R.8. Van Voorst, 1860. 



