164 



Genus PHOS, Montfort. 

 [Conch. Syst. 1810, vol. ii. pp. 495.] 



Shell elongate, bucciniform, turriculate ; spire sharp, elevated, 

 whorls oi-namented with prominent longitudinal costae, and less 

 salient spiral threads and sulci, often varicose ; aperture oblong ; 

 outer margin lirate within ; columella excavated, plicate in front ; 

 canal short, slightly twisted. 



Type. — Murex se7iltcosus, Linnaeus. 



Phos liraecOStatUS, Tenison- Woods (sp.). 



1877. Cominella lyracostata, Tenison-'Woods, Pap. Roy. Soc. Tas. 1876, 



p. 108. 



1878. Cominella lyr(Scostata, R. Etheridge, jun.. Cat. Aust. Foss. p. 160. 

 1888. Phos lircecostatus, Tate, Trans. Roy. Soc. South Aust. vol. x. p. 167, 



pi. xi. fig. 12. 

 1896. Fhos UrcBcostatus, Pritchard, Proc. Roy. Soc. Vict. vol. viii. n.s. 

 p. 90. 



Shell elongate, bucciniform, tapering; protoconch composed of 

 two and a half subcylindrical, smooth turns ; whorls elevated, 

 slightly convex, longitudinally costate, the costse being oblique, 

 large and far apart, spirally lineate, the conspicuous threads rising 

 over the costse producing a characteristic roughness, the spiral 

 ornament is irregular and interrupted in the neighbourhood of the 

 suture, that on the anterior half of the body-whorl is more 

 uniform ; aperture small, quadrate, opening widely in front ; outer 

 margin thin, striated within ; inner margin comparatively smooth ; 

 columella sharply twisted and plicated in front, reverted; canal 

 very short, broad, oblique, and supported at the back by a strong 

 spiral ridge. 



Dimensions. — Length ]6'5mm.; breadth 7 mm.; length of 

 aperture and canal 7-5 mm. 



Form, and Loc. — Eocene : Table Cape, Tasmania. 



G. 9378. Examples of the neanic and ephebic stages of growth. 



Purchased, 



