210 PLIOCENE MOLLUSCA. 



Dlinoisioiis (of Crag specimens). — L. 9 — 12 mm. B. o — 5 mm. 



Distribution. — Not known living. 



Fossil : Waltonian Crag: Little Oakley. Newbournian: Felixstowe. 

 Miocene : Italy. 



Remarks. — I have found a specimen at Oakley which seems to correspond with 

 P. Gastaldii, Bellardi, although it is considerably smaller than those figured by him 

 from the Italian deposits, but it may probably be immature ; it presents, however, 

 the characteristic features of this species, to which I refer it provisionally. 

 Bellardi says that sometimes the svirface of the shell is covered with minute spiral 

 strige, but that more frequently it is nearly smooth. The Oakley specimen shoAvs 

 no sign of sculpture. There is another and imperfect specimen of what is clearly 

 the same shell in the Castle Museum at Norwich, labelled, in "Wood's writing, 

 " P. GastahlU, Felixstow." 



Genus CLAVATULA, Lamarck, 1799. 

 Clavatula interrupta (Brocchi). Plate XXVI, fig. 20. 



1814. Murex interruptus, Brocchi, Couch, foss. Subap,, vol. ii, p. 433, pi. ix, fig. 21. 



1847. Pleurotoma interrupta, Bellardi, Mem. E. Accad. Sci. Torino [2], vol. ix, p. 559, pi. i, fig. 16. 



1856. Pleurotoma interrupta, Homes, Foss. Moll. Tert. Wien, vol. i, p. 340, pi. xxxvi, fig. 19. 



1872. Pleurotoma interrupta, S. Y. Wood, Mon. Crag Moll., 1st Suppl., pt. i, p. 32, pi. v, fig. 1. 



1872. Pleurotoma interrupta, von Koenen, Mioe. Nord-Deutsch. Moll. Faun., vol. i, p. 97, no. 109. 



1874. Pleurotoma interrupta. Van den Broect, Ann. Soc. Malac. Belg., vol. ix, p. 125. 



1875. Pleurotoma interrupta, Seguenza, Boll. R. Com. Geol. Italia, vol. vi, p. 206, no. 152. 

 1877. Clavatula interrupta, Bellardi, Moll. Terr. Terz. Piem., pt. ii, p. 169, pi. v, fig. 33. 

 1914. Clavatula interrupta, Cipolla, Palaeont. Ital., vol. xx, p. 126, pi. xii, fig. 16. 



Specific Characters. — Shell large, solid, fusiform ; spire long, gradually and 

 regularly tapering to a fine point; whorls about 10, ornamented by a raised 

 subnodular marginal band beneath the suture, a channelled depression without 

 spiral sculpture under it, and by a prominent series of granulated ridges which 

 form a rounded projection or keel from the centre of the whorls to the suture next 

 below, the ridges extending on the body-whorl to the base of the shell ; mouth 

 oval, angulate above ; labial sinus well-marked, with a small triangular notch next 

 the suture ; canal fairly long, narrow ; columella nearly straight ; outer lip 

 rounded, not expanded, slightly angulatedby the keel ; inner lip forming a rather 

 thick glaze on the pillar. 



Dimensions. — L. 45 — 55 mm. B. 15 — 18 mm. (Of Crag specimen) — L. 25 mm. 

 B. 10 mm. 



Distribution . — Not known living. 



Fossil : Newbournian Crag : "Waldringfield. 



