POLYMORPHINA SORORIA. 257 



Characters. — Shell ovate-elongate, symmetrical, pyriform; anterior portion 

 tapering, acuminate ; posterior obtuse, rounded ; margin entire, septal lines not 

 depressed. Chambers elongate, closely embracing, arranged ti-iserially. 



Polymorphina rjutta, in good specimens, presents tolerably definite characters, 

 its triserial arrangement, closely embracing chambers, and circular transverse 

 section being sufficient for ordinary diagnosis. Its long, tapering upper extremity 

 and numerous chambers distinguish it from P. gibba, and the rounded base and 

 compact spiral build from its nearest ally, Polijmorpliina (Pi/nilina) acnminatn, 

 d'Orb. 



Occurrence. — Polymorphina gutta has not hitherto been recorded in the recent 

 condition. It is best known as a Tertiary fossil, but has been found in the Hils 

 Clay (Neocomian) of Germany, in the English (Bargate) Beds of similar age, and 

 in the Gault of Folkestone. Specimens have been recorded from the Eocene 

 (London Clay and Barton Beds), from the Oligoceue of Pietzpuhl, and from the 

 Upper Tertiaines of North Italy. 



We have nothing to add to the record given in the six columns of the Table, 

 and Appendix II, Part 1, 1866, so far as the occurrence in the Crag is concerned.^ 



4. Polymorphina sororia, Benss, 1868. Plate VI, figs. 13 a, b. 



PoLTMOEPHiNA (Gutttjlina) soeoeia, Reuss, 1863. Biill. Acad. Roy. Belg., 



ser. 2, vol. xv, p. 151, pi. ii, figs. 

 25—29. 



— _ _ _ 1864. Sitzungsb. k. Akad. Wien, 



vol. xlviii, pp. 57 and 67, pi. vii, 

 figs. 72—74. 



— _ _ _ 1870. Ibid., vol. Ixii, p. 487, 



No. 9. 

 VuLTTiLiNA MINUTI8SIMA (?), Zioingli and K'uhler, 1870. Poram. Schweiz. .Tura, 



p. .30, pi. iii, fig. 42. 

 — EiCHBEEaENSis (?), Zwingli and Kiihler, 1870. Ibid., figs. 43, 43 a. 



PoLTMOEPniNA SOEOEIA, Brady, 1884. ' Challenger ' Eeport, p. 562, pl. Ixxi, 



figs. 15, 16 ; pl. Ixxiii, fig. 15. 



— — Walther, ISSS. Mitth. Neapol., vol. viii, p. 382, pl. xx, 



fig. 4. 



1 We have, however, grave doubts as to the occurrence of P. giUta in the Crag. We are 

 inclined to think that figs. 46 and 47, pl. i, might be more correctly described as P. lactea. Unfor- 

 tunately no edge views are given. 



Although stated in Part 1 of the Monograph to be very common, we have not been able to find one 

 specimen in our own sortings. — H. W. B. and E. H. 



