60 Bibliographical Notices. 



In the Mollusca, as a whole, we have the enormous increase of 

 1889 species, in 119 genera. The annexation of tlie Bryozoa, and 

 the enlarged lists of the PalUobranchiates, LamelUbranchiates, Gas- 

 teropods, and Cephalopods, make up the mass of the added material. 

 It is impossible to analyse this here. To enumerate the authors of 

 this increase m the bulk and improvement in the arrangement of 

 these species, we must catalogue the palaeontologists themselves who 

 have worked together during the last ten years, — and amongst them 

 Mr. Morris himself, as an eminent historian of the fossil molluscs 

 and of the conditions under which they lived. And, alas ! too, we 

 should have to recall the names of some, dearly lamented, who have 

 been taken from amongst us before their hands were weary of ham- 

 mer or of pen. 



We refer then to the Preface and to the Book itself for indications 

 of the work done in this wide department by the collectors, the 

 authors, and the compiler of the * Catalogue ;' and we will offer but 

 one or two special remarks. 



Amongst the most important points connected with the emended 

 catalogue of the Molluscs, we must notice that in the family of the 

 PalUobranchiates several good distinctive groupings have been use- 

 fully introduced. Thus the large group formerly comprised under 

 Terebratula has now been subdivided into Terebratula and Rhyn- 

 chonella, so well characterized not only by the peculiar position of 

 the foramen and by the external aspect, but also by the marked dif- 

 ference of the internal calcareous appendages. As minor divisions 

 of the original group, we find Argiope, Terebratulina, Terebratella^ 

 and others carefully distinguished. The genus Siphonotetra, pre- 

 viously recognized only as a Russian form, is an interesting addition 

 by the Author himself to the British list. Why the bad word 

 "Brachiopod" should be retained when every body is willing to 

 allow its inappropriateness for a creature that has not in any sense 

 either arms or feet, we cannot tell, unless it be on account of the 

 determined adhesion of some modern naturalists to the habit of 

 naming things on the lucus a nan lucendo principle. This would 

 have been a proper opportunity for throwing overboard an incorrect 

 word, the place of which is already well supplied. 



The Radiolites may now follow Biceras into the Dimyaria, and 

 take their place near the Chamidse, in accordance with Mr. S. P. 

 Woodv^^ard's elaborate exposition of the alhances of the Rudista 

 lately read before the Geological Society ; this view is also explained 

 in his valuable and concise * Treatise on Shells' lately published. 



^Amongst the mollusca there are several genera that are Nexy rich 

 in the number of their species. In these instances the species are 

 grouped either in the great geologic or the smaller stratigraphical 

 series, as most convenient for the student. Thus Avicula, Nucula, 

 and Natica have their palaeozoic, secondary, and tertiary groups ; 

 and Rhynchonella and Terebratula are sorted into palaeozoic, oolitic, 

 cretaceous, and tertiary. 



Lastly, we have occasion to remark that the locality of " Brackle- 

 sham," so important as indicative of a peculiar formation, is occa- 



