72 



Olivella nymphalis, Tate (sp.). 



1889. Oliva nymphalis, Tate, Tians. Roy. Soc. South Aust. vol. -xi. p. 145, 



pi. vii. fig. 7. 

 1889. Oliva iii/mphalis, Dennant, id. vol. xi. p. 43. 

 1889. Olivella >i!/mphalis, Cossmann, Ann. Geol. Univ. t. v. p. 1090. 



This is a more stunted form than 0. angustata, whilst the 

 plications are only two or three in number, being confined to 

 the anterior portion of the columella. The whorls have a tendency 

 to become invaginate, and the spiral sulcation near the middle 

 of the body-whorl is prominent. 



A close European ally is 0. nritreola, Lamarck, a more elongate 

 shell, from the Eocene of the Cotentin and Paris Basin. 



Dimensions. — Length 8"5 mm. ; breadth 4 mm. ; length of 

 aperture 4 mm. 



Form, and Loc. — Miocene : Muddy Creek, Victoria. 



G. 9368. Two specimens. Purchased. 



Olivella, sp. 



G. 9511-2. Two pieces of argillaceous limestone containing 

 casts of several shells, including a species of Olivella closely allied 

 to 0. angustata; from the Lower Miocene (Mangapakeha beds) of 

 Akuakua, east coast of Auckland, N.Z. Sir James Hector Coll. 



Genus ANCILLA, Lamarck. 



[Mem. Soc. Hist. Nat. Paris, 1799, p. 70; also Syst. des Anim. sans 

 Vert. 1801, p. 73.] 



Ancillaria, Lamarck, Ann. Mus. 1810, t. xvi. p. 302. 

 Sparella, Gray, Guide Moll. Brit. Mus. pt. 1, 1857, p. 26. 



Shell oblong, occasionally acuminate ; suture sometimes canali- 

 culate, but more frequently covered over by callus ; columella 

 excavated, twisted, and carrying several plications anteriorly, 

 which are not hidden by callous growth, whereas the posterior 

 portion of the columella is thick, callous, or gibbose. A depression, 

 or groove, usually separates the callosity of the spire from what is 

 commonly termed the " smooth zone," though this zone is often 

 not as smooth as the callous spire, especially when strongly 

 exhibiting the lines of growth as in certain fossil species. The 



