143 



20. Mitra citharelloides, spec. nov. Plate v., fig. ii. 



Shell narrow, ovately fusiform, ending in a moderately wide 

 and large pullus of two convex turns. Ordinary whorls four and 

 a half, convex, more sloping to, and slightly depressed at, the 

 posterior suture ; sculptured with fine, close spiral threads, about 

 i20 on penultimate whorl, and ornamented with broad, rounded 

 costa?, which end subtuberculosely at the posterior-third (ten on 

 the penultimate whorl). 



Last whorl gradually attenuated to the short, slightly reverted 

 beak, spirally lirate throughout, and wrinkled transversely, the 

 costpe entirely absent, or with one or tv/o obsolete ones at the 

 hinder part. Aperture narrow-oval ; outer lip smooth within ; 

 columella with two slender plaits, situated at about the middle. 



Dimensions- — Length, 9*5 ; breadth, 3-5 ; length of aper- 

 ture, 5. 



Localities. — Turritella-marls, Blanche Point, Aldinga Bay ; 

 clayey-green-sands, Adelaide bore. 



This species has much the aspect of some species of Cithara, 

 but there is no trace of a sutural notch. 



21. Mitra sordida, spec, nov. Plate vi., fig. 6. 



Shell small, stout, oval-oblong, blunt at both ends ; whorls five, 

 convex, smooth, ornamented with thick curved costae (ten on 

 penultimate whorl). Last whorl oblong, hardly attenuated at the 

 front; the posterior-half with fivecostse, the anterior-half smooth; 

 base spirally striate. 



Aperture narrow-oval ; outer lip thin, much arched, slightly 

 insinuate at the suture ; stoutly lirate within ; columella with 

 four stout plaits. 



Dimensions. — Length, 6-5 ; breadth, 3 ; length of aperture, 4. 



Locality. — -Upper and lower beds at Muddy Creek. 



22. Mitra semilaevis, spec. 7iov. Plate v., fig. 9. 



Shell minute, narrowly oval-oblong, Avith a large, blunt apex. 

 Ordinary whorls three, slightly conA^ex, a little margined at the 

 anterior suture, ornamented with curved sub-angular cost?e, which 

 are thicker at the anterior suture, and a few spiral stride pos- 

 teriorly ; there are twelve costse on the posterior whorl. 



Last whorl attenuated into a longish, slightly reverted beak ; 

 faintly spirally striate next the suture, transversely wrinkled in 

 the posterior half-turn. Aperture narrow oval ; outer lip lirate 

 within ; columella with four stout plaits, which are continued as 

 spiral ridges around the beak. 



Dimensions. — Length, 5 '5 ; breadth, 2 ; length of aperture, 3. 



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

 (-jchnapper Point. 



