98 Shells of the Holderness Basement Clays. 



the Mollusca of Europe and Eastern North America, Ann. 

 and Mag. Nat. Hist. 1872, p. 245, makes it the same as the 

 much larger F. islandicus of Gould (S. Stimpsoni Morch). 



Some small shells bearing the name F. curtus in his own 

 writing, contained in the Headley and Leckenby collections, 

 represent very distinct species. Mr. Harmer tells me he has 

 identified amongst them F. pygmaeus Gould, Sipho exiguits 

 F. W. Harmer, and Neptunea tenuistriata F. W. H. (the Fusus 

 curtus var. expansa Jeffr.). Two of the Headley fragments so 

 named I find agree with F. attenuatus Jeff. (Sykes, Proc. Malacol. 

 Mag., IX., p. 377 (figure), 1911), and another with S. latericeus 

 as figured by Sars, Moll Reg. Arct. Norveg. pi. XV., fig. 8. 



Mr. Harmer (Pliocene Mollusca) has adopted Jeffreys' name 

 for a group of Crag Shells and Mr. Friele uses it for a number 

 of other North Sea Siphos. One of these, figured by Wood as 

 Trophon leckenbyi, is correlated by Jeffreys with his Fusus 

 turgidulus, but the identification is not satisfactory. 



Fusus sabinii vide Woodward (in Brit. Mus.), Jeffreys 

 also correlates with F. (Neptunea) spit zber gen sis Reevz. 



Note C. — Astarte: — Forbes and Hanley and Jeffreys 

 agree upon the extreme range in variation of the different 

 members of this difficult genus and I have thought it better 

 to give the Bridlington shells, numerous as they are, the names 

 whether they are specific or varietal that have been assigned to 

 their representatives elsewhere ; and as Dr. Dall says, writing 

 in 1902 upon this genus in the Proc. Nat. Mus., Washington, 

 XXIV., p. 934. " Whether these be regarded as species or 

 not, we have the satisfaction of knowing what we mean when 

 we employ a name." 



All the forms referred to live considerably within the 

 Polar Circle. The periostracum on two of my specimens is 

 fairly well preserved and shows definite colour stripes, radiating 

 from the apex to the ventral edge, a somewhat unusual feature 

 in these shells. 



(To be continued). 



The Manufacture of Historical Material, by J. W. Jeudwine. London, 



Williams and Norgate, 268 pp., 6s. net. This is ' an elementary study 

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Naturalist, 



