139 



Dimensions. — Length, 8; breadth, 3 '5; length of aperture, 5- 

 Locality. — Clayey-green-sands, Adelaide bore. 



8. Mitra ligata, spec. nov. Plate v., fig. 4. 



Shell rather thin, elongate-ovate, attenuated at each end ;: 

 whorls seven, smooth, shining, very slightly convex, perceptibly 

 constricted in front of the anterior suture, giving rise to the 

 appearance of a spiral rib margining the suture. Aperture nar- 

 row-elliptical ; outer lip sharp, lirate within; columella with five 

 plaits. 



Dimensions. — Length, 7 ; breadth, 3 ; length of aperture, 4. 



Localities.- — Lower beds at Muddy Creek ; blue clays at 

 .Schnapper Point. 



9. Mitra othone, Tenison Woods. Plate iv., fig. 10. 

 Reference. — Proc. Lin. Soc, N. S. Wales. 



A small biconic shell, pointed at both ends, apex blunt of two 

 and a half smooth whorls. Ordinary whorls separated by an 

 impressed suture, sculptured with spiral threads which are more 

 or less granulose, especially on the posterior part of spire, by 

 transverse lirse or slender costse. Last whorl lirate and trans- 

 versely striate ; columella with four well-developed plaits. 



Dimensions. — Length, 12; breadth, 5 ; length of aperture, 8. 



Locality. — Lower beds at Muddy Creek. 



10. Mitra atractoides, spec. nov. Plate iv., fig- 11. 



Shell narrowly fusiform-biconic, with a moderately elevated 

 spire, ending in a blunt conoidal pullus of four smooth turns. 

 Whorls five, excluding pullus, slightly convex, with a linear 

 suture, sculptured with raised spiral threads and tessellated by 

 curved transverse threads. Last whorl, with cancellate orna- 

 ment, a little ventricose in front of suture, medially attenuated, 

 but slightly dilated at the front. 



Aperture very narrow ; outer lip thin, smooth within, medially 

 ecurved ; columella nearly straight, with four plaits, the anterior 

 one small. 



Dimensions. — Length, 21 ; breadth, 7; length of aperture, 12. 



Locality. — Lower beds at Muddy Creek. 



This species has a resemblance to M. othone, but difiers by its. 

 long spire, sub-cylindric pullus, and by certain details of its orna- 

 mentation. 



11. Mitra escharoides, spec, noa, Plate v., figs. 8a — b. 

 Shell stout, narrow-fusiform, ending in a sub-cylindric pullus 

 of two smooth whorls. Whorls six, excluding pullus, slightly 

 convex ; sculptured with broad, flat, transverse ribs, and by nar- 

 rower spiral ones, which include between them large, roundly ob- 



