Webster. — Additions to N.Z. Mollmcan Fauna. 257 



Sent to me by Mr. T. Iredale, a painstaking and enthusiastic 

 conchologist, who seems to be doing good service in the difficult 

 branch comprising our marine minutiae. 



I have much pleasure in calling this pretty shell after the 

 discoverer. 



Thaumatodon mira, n. sp. Plate XXI, fig. 23. 



Whorls 4, the last descending more than that of Th. tan. 

 Colour horny, banded with chestnut. Protoconch 1|- whorls, 

 finely malleated. Sculpture : Body-whorl with 40 varicosely 

 angled sinuous ribs, also growth-lines and fine spiral striations. 

 Umbilicus pervious, occupying ^ of the major diameter. Aper- 

 ture advancing slightly above. The apex is more deeply sunk 

 than that of Th. tau, the crown being quite hollow. The body 

 has a lamella within the aperture, not easily recognised as bifid 

 in the position in which the shell is drawn (fig. 23), but its cha- 

 racter is clearly seen by revolving the shell slightly: In the 

 illustration the lower flange is seen somewhat sideways, the 

 upper flange appearing edgeways above it ; the latter is more 

 prominent than the former. A second short lamella is seen 

 on the outer lip near the columella. Some specimens have a 

 callous white patch inside the aperture on the periphery, thus 

 almost linking them with Th. tau, which usually, however, has 

 a third lamella without a white patch. The exterior of the 

 shell bears no resemblance to Th. tau. 



Major diameter, 3 mm. ; minor diameter, 2-75 mm. ; height, 

 1-5 mm. 



Hab. — Waiuku ; not common. 



Type in my collection. 



In vol. xxxA'ii of these Transactions I mentioned that speci- 

 mens of Th. varicosa found in this neighbourhood had 2 lamellae 

 in the aperture instead of 1, as recorded by Suter fide Mr. E. A. 

 Smith. A closer examination reveals the division of the body 

 lamella into 2 flanges, which seems to remove this shell from 

 Th. varicosa : it is still further separated by the fact that Pfeifler 

 describes Th. varicosa as moderately umbilicated and Th. tau 

 as widely so, while my new shell is more widely umbilicated 

 than Th. tau. The latter is one of our commonest shells, and is 

 very variable in the number of ribs ; but their character is con- 

 stant. These shells also vary in height. I have one specimen 

 almost the same height as Charopa egesta, which it greatly re- 

 sembles in outline. 



Kellia bifurca, n. sp. Plate XXI, figs. 24-29. 



Shell somewhat quadrate, pale-grey ; at first glance some- 

 what resembling K. parva in sculpture, but a closer examination 

 9— Trans. 



