Mak(:^hai,l. — FduiKt of the Hamitden Bah. 227 



Turritella rudis n. sp. (Plate XVII, fig. 3.) 



Shell small, the largest specimen 15 mm. by 6 mm. Sharply conical. 

 Whorls narrow. In a small specimen 7 mm. long there are eleven whorls. 

 Each whorl with some broad spiral ribs more or less broken into rounded 

 or blunt nodules in large numbers. In the higher whorls there is generally 

 only one of these ribs, nearly median in position, but in the lower whorls 

 there are generally four. The spaces between these ribs have a number 

 of fine spiral Lines. There are no axial riblets. Suture deep. 



Several specimens, in good condition. The species is closely related to 

 7". ornata. 



Type in the Wanganui Museum. 



Submargarita ? tricincta n. sp. (Plate XV, fig. 14.) 



Shell small, turbinate, slightly conic above. Whorls 3| to 4. Spire 

 very small ; protoconch depressed. The last whorl comparatively very 

 large, slightly angulated by the last three spiral riblets. The lower riblet 

 defines the basal area, which is contracted and slopingly convex. Sculp- 

 ture : On the body-whorl, in addition to the three principal riblets, there 

 are on the base a number of minute threadlets which vanish on approaching 

 the basal margin. Between the basal and middle principal spirals are 

 about five minute threadlets. The space above is narrower and has 

 two or three threadlets. Between the upper principal spiral and the 

 suture is a fairly wide area, sloping, slightly convex, and with four or 

 five threadlets ; irregular growth-striae cut the threadlets into minute 

 gemmules. The apex is somewhat eroded, and sculpture, if any, is not 

 determinable. Sutures somewhat impressed. Aperture roimded ; outer lip 

 slightly eftuse, more marked on the basal area. Columella narrow above, 

 then expanding into a stout freely projecting plate which unites with the 

 basal lip. Parietal wall thinly calloused, minutely perforate. Beneath the 

 outer calcareous layer the shell is somewhat iridescent. Height, 5-2.5 mm. ; 

 breadth, 5 mm. 



This species was submitted to the late Mr. Suter, and he suggested its 

 inclusion in Submargarita. There is one example only, and it appears to 

 be adult and not the juvenile of Turbo or Astraea. 



Type in the Wanganui Museum. 



This description was kindly written by Mr. Murdoch. 



Erato antiqua n. sp. (Plate XV, fig. 7.) 



Shell small, 4^ mm. by 3J mm. Broadly oval, but slightly produced 

 anteriorly. Aperture almost linear, but rather wider in the anterior than 

 in the posterior portion. Outer lip much thickened, with numerous denticles. 

 Spire comjiletely covered by the body-whorl and a posterior callosity. 

 Surface quite smooth and polished. 



One specimen only, in good condition. The small size and absence of 

 a distinct spire distinguish this species from E. neozelanica Suter. This 

 is the only other species of the genus which has been found in New Zealand. 



Type in the Wanganui Museum. 



Epitonium tenuispiralis n. sp. (Plate XVII, fig. 6.) 



Complete shell not available. Four whorls of the spire only, which 

 measure 10 mm. by 5 mm. The whorls taper rather rapidly. Radial ribs 

 slightly rounded, })rominent, about fourteen on each whorl. Interstices 

 8* 



