530 Mr. H. B. Preston on new 



Belloconcha compacta, sp. n. 



Shell imperforate, turbinate, in subfossil condition pale 

 yellowish white, showing truces of a rather narrow, white, 

 peripheral band; whorls 4^, very slightly convex, marked 

 only with oblique growth-lines ; suture impressed ; base of 

 shell moderately convex ; columella margin narrowly, out- 

 wardly refiexed, obliquely descending and curved below ; 

 aperture subovate. 



Alt. 6*5, diam. maj. 10, diam. min. 9 mm. 



Aperture : alt. 4*5, diam. 4*25 mm. 



Bab. Nepean Island, in subfossil state only (R. Bell). 



Belloconcha norfolkensiSj sp. n. 



Shell somewhat depressedly turbinate, obtusely carinate at 

 the periphery, thin, corneous, light reddish brown, painted 

 with a very narrow sutural band of dark chestnut and 

 a slightly broader, whitish, peripheral band ; whorls 4^, 

 regularly increasing, rather Hat, coarsely sculptured witli 

 oblique radiate riblets ; base of shell somewhat shining, obso- 

 letely minutely granulate ; suture impressed, narrowly mar- 

 gined below ; columella tinged with dark chestnut, sharply 

 curved and outwardly expanded above, white and somewhat 

 bulging inwards below ; labrum acute, simple; aperture 

 irregularly sublunate. 



Alt. 6'5, diam. maj. 10, diam. min. 9 mm. 



Aperture: alt. 5*25, diam. 5 mm. 



Bab. Norfolk Island. 



IKEDALEOCONCHA, gen. nov. (Zonilidce). 



Shell heliciform, depressed, corneous, imperforate, having 

 a widely grooved suture, which is continued on the last whorl 

 as a supraperipheral channel. 



Genotype : I. inopina, Preston. 



The present genus is at first sight almost identical with 

 Diepenheimia, which inhabits the Ubi Islands, Dutch East 

 Indies * ; this latter is, however, ]>erforate, while both the 

 species of Iredaleoconclia which have as yet come to light are 

 quite devoid of all trace of perforation. 



Iredaleoconclia inopina, sp. n. 



Shell small, imperforate, suborbicular, depressedly conoid, 

 yellowish, semitransparent, polished, shining ; whorls 3£, 



* Ann. & Mag. Nat, Hist, ser. 8, vol. xii. 1913, pp. 433-434. 



