256 Transactions; 



These shells (about 50), obtained by dredging, show many 

 variations of apex between these types ; the protoconch is 

 never sunk below the crown, as in Cylichna. In the Manual 

 no similar shell appears. 



Height, 3 mm. ; breadth, 1-25 mm. 



Hab. — Orua Bay, Manukau Harbour ; in 3 fathoms. 



Types in my collection. 



Trochus carmesinus, n. sp. Plate XX, figs. 16-18. 



Shell broadly conical, with 4J slightly triangulate whorls 

 and flattened base. Colour pale-pink, speckled and marbled 

 with bright crimson. Sculpture : The entire shell finely spirally 

 striated, about 21 on body- whorl and the same on base ; a smooth 

 band round periphery. Protoconch very small, of 1^ whorls. 

 Suture distinct, not deep. Aperture quadrate. Columella very 

 sloping, with a large denticle near its junction with the body. 

 Umbilicus : A pervious funnel, in which the spiral is faintly 

 visible. Animal and operculum unknown. 



Height : Major diameter, 8 mm. ; minor diameter, 6-25 mm. 



Type in my collection. 



One beach specimen from Russell has been iu my possession 

 for some years. Confirmation has now arrived in the form of 

 two specimens from Cape Palliser, found in shell sand. 



Trochus oppressus, Hutton, is dark-green in its normal 

 condition, and has a band of sharp radiate wrinkles beneath 

 the sutures, the plain band round the periphery alone being 

 polished. It is possible that this is the shell referred to by 

 Suter (P. M.S., vol. ii, pt. 6, p. 261) as having been reported by 

 T. W. Kirk from Wellington. 



Thaumatodon iredalia, n. sp. Plate XXI, figs. 19-22. 



Whorls 4, last descending. Colour horny, irregularly blolehed 

 with dark-brown. Protoconch I] whorls, striated. Sculpture : 

 Body-whorl with growth-lines, spiral striations, and 13 strong 

 ribs, which slope backwards from the siriure. and extend, sloping 

 forwards, into the umbilicus, which is pervious, and occupies 

 } of the major diameter. Aperture advancing slightly above. 

 The body has I simple lamella within the aperture ; it is hardly 

 visible until the shell is revolved so as to see well into the opening 



( fi g- 21 > 



Major diameter, 3-25 nun. ; minor diameter, 3 nun. ; height, 



I ■•") nun. 



Hab. — Two specimens, both dead, but in perfect condition,. 

 from Ashley Gorge, Canterbury. (Bush since burnt.) 



Type to be presented to the ( 'hristchurch .Museum. 



