NEWTON: NEW BRITISH EOCENE GASTROPODA. 331 



Volvulella lanceolata, J. de C. Sby., R. B. Newton, Syst. List Edwards 

 Coll. British Museum, 1891, p. 269. 



This species was originally characterized as "acutely conical, with 

 a produced base, smooth, except a few striae near the pointed apex 

 and six or seven near the base ; aperture very narrow, its lip 

 extended beyond the apex and slightly expanded and reflected at 

 the base." The following further details are necessary for a better 

 elucidation of this shell. It is generally slender and elongate, having 

 an extremely narrow aperture and pointed summit; the lip extends 

 posteriorly beyond the body-whorl in the form of an acute rostrum, 

 anteriorly it is twisted and expanded ; a narrow umbilical slit is 

 present behind the reflected lip ; surface ornamented with spiral 

 grooves, which nearly always cover the test, but sometimes occur 

 only at the terminal areas of the shell, leaving the space between 

 quite smooth : the spiral grooves themselves bear deeply indented 

 punctations. Dimensions: alt. 3*5, diam. 2mm. 



Sowcrby's type in the Edwards Collection of the British Museum 

 shows a smooth central region between the stria?, but after examining 

 a large number of examples of this species, this is found to be by no 

 means a constant character, the central space varying very much in 

 width ; whilst many specimens are covered with continuous spiral 

 striae. The species ranges from the Bracklesham Beds, in which it 

 is extremely rare, to the Barton Beds, in which it is well represented. 



Formations and Localities. — Upper Eocene (Barton Beds) : Barton 

 and High Clifi: (figured specimen). Middle Eocene (Bracklesham 

 Beds) : Brook, New Forest ; Bracklesham Bay, Sussex. 



Deillia geanulata, Lamarck. 



Pleurotoma granulata, Lamarck, Ann. Mus. Paris, 1804, vol. iii, p. 266; 



ihid. 1806, vol. vii, pi. v, figs. 4«, 4.b. 

 Pleurotoma formosa, Cbarlesworth M8. (^non Reeve). 

 Pleurotoma granulata, Lam., var. formosa, Edwards, Mon. Pal, Soc. 



1860, p. 264, pi. xxviii, figs. 4a-4^. 

 Brillia {Crassispira) granulata (Lam.), Cossmann, Ann. Soc. R. Mai. 



Belgique, 1889, vol. xxiv, p. 278. 

 Clavatula granulata (Lam.), Konen, Abhandl. Geol. Spec. Kart. 



Preussen, 1890; vol. x, part 2, p. 449, pi. xxxiv, fig. 22. 



The shell bearing Cbarlesworth' s MS. name of Pleurotoma formosa 



I have referred to Brillia granulata, Lamarck, their characters being 



identical. Edwards, however, thought he could see some minor 



differences, and established /orwiosrt as a variety of the older form. 



The species is characterized by the regular rings of granulations 

 produced by the crossing of the spiral and longitudinal lines, a more 

 distinct series being present on the posterior sutural margins of the 

 whorls ; the whorls are slightly depressed and angulate at the suture ; 

 the embryo is conoidal and smooth ; the apertuz'e has a deep posterior 

 sinus and a prominently arched labrum. The anterior canal is not 

 truncated as in Swainson's genus Crassispira, and for that reason 

 I prefer to regard this form as a true Brillia. 



