Notes and Comments. 179 



'Collection has recently been placed, and steps have been taken 

 to prepare the Museum for public inspection. When it is 

 remembered that in the archctological collection alone there 

 are the entire contents of nearly four hundred barrows of the 

 bronze age, as well as several hundred skulls of Prehistoric, 

 Roman and Saxon date, and there are about 1,000 Prehistoric, 

 Roman, Saxon and Mediaival vases, some of large size, and 

 the contents of several Anglo-Saxon and Roman cemeteries, 

 it will be understood that the removal of the collection 

 has been an undertaking of some magnitude. Nearly 20 

 van-loads were required to remove the specimens, and we 

 imderstand the entire collection, consisting of about 60,000 

 objects, has reached its new quarters without damage.' 



AMMONITE NOMENCLATURE. 



At a recent meeting of tlie Geological Society of London, 

 Mr. A. E. Trueman read a paper on ' The Evolution of the 

 Liparoceratidae.' The Ammonites considered included several 

 sub-parallel series, of which four genera were indicated by 

 Mr. S. S. Buckman in ' Yorkshire Type Ammonites.' The 

 details of ontogeny and the sutures, which had not hitherto 

 been compared, have been employed in constructing tables 

 showing both the biological and the stratigraphical relations of 

 the various species ; a revision of the existing classification is 

 proposed. The early members of each series are similar 

 ' Capricorn ' forms with slender whorls and stout ribs (for in- 

 stance, A. capricorfiiis, A. latecosta, A. macnlatus). In some- 

 what later examples the outer whorl is swollen, and has paired 

 tubercles (for instance, A. heterogcnes). From this stage the 

 tendency is to shorten the period with slender Capricorn 

 whorls by accelerating the development of bituberculation and 

 prolonging the period of pre-costate globose whorls ; thus the 

 most advanced members of each series are stout bituberculate 

 forms (for instance, A. striatus, A. hechei), which do not pass 

 in development through a Capricorn stage. 



NEW GENERA. 



The following genera may be recognized ; each includes 

 ammonites of the three types mentioned above : — 



1. An earlier group, with tubercles paired in the involute 

 stages ; Radstock (Somerset) is the only British locality 

 where these ammonites have been found. 



Parinodiceras. gen. nov. Elevated whorl, paired tubercles, the 

 inner and outer rows widely separated. Gcnoholotype. Am- 

 monites striatus parinodits Quen.stedt (18S4, pi. xxviii,, fig. 6). 



Gen. nov. Round whorl, with the rows of tubercles placed close 

 together. Genoholotype, a specimen to be figured as a new 

 species. 



2. A later group, with unpaired tubercles in the involute 

 stage. These genera are most readily distinguished by sutural 

 characters, namely, the relative depths of the external lobe 



1918 June 1. 



