134 Transactions. 



suture below, on the last numerous, exceeding twenty, and narrower than 

 the grooves ; axials consist of growth-striae only. Sutural line not deep, 

 in places obscured by the spirals above and below. Aperture imperfect, 

 rather narrow, the posterior sinus as indicated by the lines of growth 

 situated at the nodular angle ; columella almost straight, thinly callused, 

 the anterior end missing. 



Length, 26mm. ; width, 10mm. 



Locality, Hampden. Collected b}^ Dr. Marshall. 



Type to be presented to the Wanganui Museum. 



The material consists of a single specimen of five whorls, including 

 the last except its anterior extremity. The distinctive characters are the 

 marked corrugation on the last whorl, which is a continuation of the 

 peculiar excavate sutural area, the long sloping shoulder, and the prominent 

 nodular angle. 



Surcula torticostata Marshall. (Plate VIII, fig. 15.) 



S. torticostata Marshall, Trans. N.Z. Inst., vol. 51, p. 232, pi. 12, 

 fig. 7, 1919. 



This species was described from very imperfect material, consisting 

 of upper spire-whorls only. An almost perfect specimen is now available, 

 and we offer the following amended description. 



Shell fairly large, narrowly fusiform, the aperture and canal apparently 

 rather less than the spire in length (the anterior end of the canal missing). 

 Sutures not deep, margined below by a flat rather prominent rib. Whorls 

 nine or ten, flat or slightly concave below the sutural rib, thence lightly 

 convex, the last gradually tapering to the canal. Axial sculpture varying 

 as the shell progresses ; apical whorls apparently smooth ; then follow 

 twisted, prominently backward-sloping narrow riblets, which arise a little 

 below the sutural rib, and are suppressed a little above the lower suture, 

 and on the later whorls, especially the penultimate and last, reduced to 

 slight undulations and in places absent ; growth-striae well marked, 

 prominent on the last ; the spirals consist of numerous fine feebly-raised 

 threadlets wider than the grooves and forming irregular minute granules 

 on crossing the growth-striae. Aperture narrow, deeply channelled above ; 

 outer lip sharp, curving forward rather abruptly from the posterior sinus, 

 which is situated immediately below the sutural rib ; columella and body- 

 wall thinly callused, the callus on the latter margined by a rather pronounced 

 double groove. 



Length, 59 mm. ; width, 14 mm.'; length from aperture to apex, 34 mm. ' 



Locality, Hampden. Collected by Dr. Marshall. 



This specimen to be lodged in the Wanganui Museum. 



Surcula hampdenensis n. sp. (Plate VI, fig. 7.) 

 Shell narrowly fusiform ; whorls obtusely angled ; spirally Urate ; short 

 oblique axials at the shoulder and the sutures margined below. Whorls 

 eight, the apex minute, thence gradually increasing, the last viewed dorsally 

 exceeding the spire in length. Almost flat below the angle, then gradually 

 sloping to the long anterior canal, the extremity of which is missing. On- 

 the spire-whorls the angle is slightly above the middle, the area above and 

 below very slightly convex. Sculpture : Excluding the apex, the first four 

 whorls with irregular ill-defined axials extending across the whorls ; follow- 

 ing these the angle well defined and on it developed fourteen or fifteen 

 backward-sloping axials, narrower than the interspaces and not extending 

 to the sutures below ; growth-striae, especially on the last, strongly marked ; 



