STl'HO (IRACrLLS. 177 



The Recent form now recognised as S. torfuoh-t/ji, Reeve, moreover, differs 

 materially from some of the fossils described by Wood under that name. 



Jn 1882 Nyst still used the name F. gracilw for specimens similar to those 

 described by Wood which occur in the Scaldisien deposits of Belgium (Conch. Terr. 

 Tert. Belg., p. 15), and it is even now generally employed in this country for such 

 shells. 



Although, following Mr. Friele, I regard many of our Crag Siphos as belonging 

 to Jeffreys' species, 8. curtns, there are specimens in these deposits which I think, 

 as does Mr. Friele, should be referred to S. gracilis and its varieties. One of these 

 (PI. XX, fig. 4) may be regarded as the typical Crag form of that species; it is 

 somewhat more slender, however, than the Recent North Sea shell. ^ Prof. Kobelt 

 figures a more elongate specimen (see below) which approaches my fig. 7. 



Var. Coulsoni, Jordan. Plate XX, figs. 5, 0. 



1890. SipJio gracilis, var. Coulsoni, Jordan, Journ. of Couch., vol. vi, p. 232. 



Dimensions. — L. 50 mm. B. 20 mm. 



Bistrihntiou. — Recent: Unst, in 60 — 90 fathoms. 



Fossil : Waltonian Crag : Little Oakley. 



Bemirlis. — The imperfect Crag shell represented under this name is from 

 Oakley. It is smaller, more slender and more delicate than the type, corresponding- 

 very nearly with a Recent specimen from Mr. de B. Tomlin's collection w^hich I 

 have figured with it. _ I have noticed a similar form, Recent, in the Zoological 

 Museum at Stockholm. 



Var. elongata, no v. Plate XX, fig. 7. 



1876. Sipho gracilis, Kobelt, Jalirb. Deutsch. Malak. Gesellscli., vol. iii, p. 165, pi. iv, fig. 1. 

 1887. Neptunea gracilis, Kobelt, Icon, schalentrag. europ. Meereseoncli., vol. i, p. 72, pi. xiii, 

 fig. 4. 



Dimensions. — L. 60 mm. B. 24 mm. 



Distribution. — Fossil : Coralline Crag : Boy ton. 



Remarks. — The fossil figured under this name, which was found at Boyton, 

 resembles Mr. Tomlin's specimen of var. Coulsoni in form and in its spiral 

 sculpture, but differs from it in being larger, somewhat less slender, and in its more 

 elongate spire. It corresponds more or less nearly with some specimens in my 



1 The wider British form of 8. gracilis does not occur at Oakley, and is not known to me from 

 other horizons of the Crag. 



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