ATRACTODON ELEGANS. 365 



with the outer lip; columella tortuous, excavated in the middle; canal short, 

 twisted, turning to the left. 



Dimensions. — L. 85 — 1 1 <> mm. B. 45 — 55 mm. 



Distribution. — Not known living. 



Fossil: Coralline (-rag: Sutton, Orford. Walton ian : Little 

 Oakley. Newbournian : Waldringfield, Newbonrn, Felixstow. 



Scaldisien, Poederlien : Antwerp. 



Rem arks. — The present species, originally described by Charlesworth from a 

 specimen found on the beach at Felixstow, was considered by Wood as a Coral- 

 line Crag form derivative in the Red Crag, but it may be remarked that it occurs 

 both in the Scaldisien and Poederlien of Antwerp in perfectly fresh condition, 

 showing no signs of derivation. It does not appear to have been obtained either 

 from the Diestien or the zone a Isocardia cor (Casterlien) of Belgium ; but our 

 knowledge of the molluscan fauna of those horizons is small and doubtless 

 incomplete. 



The figure given by Charlesworth (op. cit.) is good and characteristic, but his 

 type specimen has for the present disappeared. It belonged, as he states, to 

 Mr. W. S. Fitch of Ipswich, not, as has been sometimes supposed, to Mr. Robert 

 Fitch of Norwich. Mr. Bell informs me that the former died in 1859, and that his 

 collections were then sold by auction. The best existing example of the Red 

 Crag Atraetodon is in the Ipswich Museum. It was found by the late Mr. Canham 

 in the section at Waldringfield, and was quite unworn. 



Considerable difference of opinion has existed as to the correct nomenclature 

 of this form. For the most part it has been referred to Fitsus, 1 but it is hardly 

 characteristic of that genus. More recently it has been grouped by M. Cossmann 

 under the generic and sub-generic terms Ghrysodomus and Siphonorbis." On the 

 whole, however, it is so different from anything belonging to those genera known 

 to us that I prefer to retain the name of Atraetodon originally given to it by 

 Charlesworth. 



Var. inflata, nov. Plate XXXVII, figs. 10—1:3. 



Varietal Characters. — Differs from the type in its more convex and tumid 

 whorls, in the shape of the mouth, and in its expanded and rounded outer lip. 



Dimensio?is. — (Of Belgian specimen.) L. 54 mm. B. 29 mm. 



Distribution. — Fossil : Waltonian Crag: Little Oakley (?). 



Scaldisien, Poederlien : Antwerp. 



Remarks. — The Belgian fossil given under this name is one of two which my 

 friend M. Van de Wouwer was kind enough to allow me to select from his collection 



1 Jeffreys gives our shell in Prestwich's paper as F. antiquus, var. 



2 Op. cit., vol. iv, p. 100 ; vol. vi, p. 121. 



