19 



Cuvier, but on reference to the French savant's work ' it will 

 be noticed that he refers merely to " Les Limacines"; the author 

 who really established the genus was Lamarck, as above quoted. 

 The last-mentioned author, however, did not give the name of 

 the species correctly. 



Tijpe. — Limacina helicialis (= Clio heliciyia, Phipps). 



Limacina tertiaria, Tate (sp.). 



1887. Spirnli.i tertiaria, Tate, Traas. Eoy. Soc. South Aust. vol. ix. 



p. 196, pi. XX. figs. I2a-e. 

 1889. Spiralis tertiaria, Dennant, id. vol. xi. p. 48. 



Shell umbilicated, thin, and shining ; spire depressed to the 

 level of the body- whorl, which is greatly expanded; the last 

 whorl rapidly enlarges, is regularly curved, except near the 

 suture, where it is rapidly descending ; umbilicus small, but deep ; 

 the peristome is slightly reflected in its vicinity ; surface of shell 

 ornamented with fine lines. 



Australian authors include this species in a genus Spiralis ; 

 it is presumed that Spirialis is intended. Dr. Pelseneer divides - 

 Spirialis, Eydoux and Souleyet, into two groups, according to the 

 presence or absence of an umbilicus, and other characters. The 

 species above described, following that classification, falls into 

 the genus Limacina. 



Dimensions. — Diameter about 1 mm. 



Form. a}i(l Loc. — Eocene : Muddy Creek, Victoria. 



G. 9308. Three specimens. Purchased. 



Family CAVOLINIID^. 



Genus CLIO, Linnaeus. 



[Syst. Nat. eil. 12, 1767, vol. i. pt. 2, p. 109-1 ; tion 0. F. Miiller, 1776.] 



Cleodora, Pi'ron and Lesueur, Ann. Mus. Hist. Nat. Paris, t. xv. 



1810, p. 66. 

 Balantium, Eenson, Journ. Asiat. Soc. Bengal, vol. vi. 1837, p. 151. 



' Eegne Animal, t. ii. 1817, p. 380. - Op. cit. pp. 15, 32. 



