686 PLIOCENE MOLLUSCA. 



twice as long as the spire, sub-angnlate above, rounded below ; outer lip 

 expanded ; inner lip forming a nearly straight but inclined margin to the mouth, 

 with a thick callus upon the columella; umbilicus large and very deep, in the type 

 form (fig. 2) wholly open, in the variety discrepans (fig. 3) partly covered by the 

 callus. 



Dimensions, — L. 30 mm. B. 25 mm. 



Distribution. — Not known living. 



Fossil: (With the var. discrepans) Coralline Crag: Gedgrave, 

 Ramsholt, Boy ton. Waltonian : Beaumont, Little Oakley. Newbournian : 

 Sutton, Shottisham, Waldringfield. 



Casterlien, Scaldisien, Poederlien : Belgium. 



Miocene : Portugal. 



Remarks. — Two very different forms have been recognised from the Crag 

 under the name of X cirriformis. Whether they should be regarded as specifically 

 distinct or only as varietal may perhaps be left an open question. As they are 

 clearly allied it may perhaps be more convenient for the present to consider them 

 as varieties of the same species. 



The type form, that originally described by Sowerby, having a deep and 

 open umbilicus, is here represented by a specimen from Oakley (PI. LV, fig. 2). 



The other (fig. 3), for which I propose the name var. discrepans, corresponds 

 with Wood's shell (pi. xvi, fig. 7) and with those figured by Xyst, in which the 

 umbilicus is partly covered by callus. They agree more or less closely with that 

 given by MM. Dollfus, Cotter and Gomes from the Miocene of Portugal. The 

 other references given above may possibly include the two, but at present I have 

 no means of ascertaining. Both occur at Oakley. 



Natica (Lunatia) catenoides (S. V. Wood). Plate LY, fig. 1. 



1842—85. Natica catenoides, S. V. Wood. Ann. Mag. Nat. Hist. [1], vol. ix. p. 529, 1842 ; Mon. Crag 



Moll., pt. i, p. 141, pi. xvi, fig. 10, 1848; in J. Starkie Gardner, Quart. Journ. Geol. Sue. vol. xli, 



p. 96, 1885. 

 1843—81. Natica Sowerbyi, Nyst, Coq. foss. Belg , p. 441. no. 384, pi. xxxvii, fig. 31, 1843; .V. 



catenoides, Conch. Terr. tert. Belg., p. 66, pi. v, fig. 7, 1881. 

 1870. Natica catenoides, A. Bell, Ann. Mag. Nat. Hist. [4], vol. vi, p. 215. 

 1871-85. Natica heros, Jeffreys in Prestwicli, Quart. Journ. Geol. Soc, vol. xxvii.pp, 144, 489, 1871 ; 



in J. Starkie Gardner, Quart. Journ. Greol. Soc. vol. xli, p. 96, 1885. 

 1872. Natica catenoides, A. aud E. Bell, Proc. Geol. As>oc, vol. ii. pp. 203, 209, 213. 

 1890. Natica catenoides, C. Reid, Plioc. Hep. Brit., p. 2W. 

 is'jj. Natica catenoides, Van den Broeck, Bull. Soc. Belg. Geol.. vol. vi (M&moires), pp 122. 132. 



147. 

 1897. Natica {Neverita) catenoides, A. Bell, Trans. Roy. Geol. Soc. Cornwall, vol. xii. p. 145, pi. ii, 



fig. 6. 

 1912. Natica catenoides, Tesch, Med. v. Rijks. v. Deli'stoffeu, No. 4, p. (it>, no. 143. 



