344 



Limarca angustifrons, Tate. 



1886. TAmarca angustifrons, Tate, Trans. Roy. Soc. South Aiist. vol. viii. 

 p. 135, pi. viii. figs. 5a-J. 



Shell small ; anterior margin rounded, posterior truncated ; 

 surface radially ribbed and concentrically lineated ; ligamental pit 

 excavated in the hinge-line, oblique, directed backwards ; anterior 

 to this pit are three prominent, almost horizontal denticles, and, 

 posteriorly, are four longitudinal teeth ; inner margin of the valves 

 crenulated. 



Dimensions. — Height 5-5 mm. ; length 5 mm. 



Form. a7id Loc. — Eocene : Adelaide, South Australia. 



L. 9873. Examples of both valves. Purchased. 



Genus LIMOPSIS, Sasso. 

 [Giomale Ligustico di Scienze, An. i. 1827, p. 476.] 



Distinguished from Pectunculus, with which it is closely related, 

 by the presence of a deep triangular pit underneath the umbo, 

 by the less restricted but relatively broader cardinal border, and 

 fewer teeth, which are oblique and best developed at the sides. 



Type. — Area aurita, Erocchi. 



Limopsis insolita, G. B. Sowerby (sp.). 



1846. Trigonocoelia insolita, G. B. Sowerby, in Darwin, Geol. Obs. South 



America, p. 252, pi. ii. figs. 20, 21. 

 1865. Limopsis insolita, Zittel, Eeise der Novara, Palaontologie, Bd. i. 



Abth. ii. p. 48, pi. xiii. fig. 1. 

 1873. Limopsis insolita, Button, Cat. Tert. Moll. N.Z. p. 28. 

 1886. Limopsis insolita, Tate, Trans. Eoy. Soc. South Aust. vol. '^dii. p. 134. 

 1893. Limopsis insolita, Tate and Dennant, id. vol. xvii. pt. 1, p. 224. 

 1895. Litnopsis insolita, Tate and Dennant, id. vol. xix. pt. 1, p. 112. 



Shell ovate, oblique ; surface concentrically ridged, and faintly 

 longitudinally striated, the striae being most pronounced towards 

 the ventral mai-gin ; hinge-line curved, carrying a few conspicuous 

 teeth almost vertical in the centre ; under the umbo is a well- 



