100 



Subgenus PTEROSPIRA,' nov. subgen. 



Shell broadly fusiform; protoconch bulbous, granular, much 

 larger than succeeding whorls, initial portion lateral and hidden ; 

 whorls spirally striated, tuberculose at the periphery, body-whorl 

 very large, outer margin in adults forming a wing-like expansion, 

 with a broadly rounded, auriculate posterior margin, rising nearly 

 up to the suture of the penultimate whorl for attachment; inner 

 margin covered by a thin deposit of callus; columella excavated 

 in the middle and furnished with three large, equal, prominent 

 plications. 



The wing-like expansion of the outer margin of the aperture 

 and the enormous globose protoconch serve to distinguish Pterospira 

 from all other groups of the A^olutid^. The general character 

 of the larval shell is that of Fulgoraria, as typified by Valuta 

 rupestris, Gmelin. 



Type. — Valuta hannafordi, M'Coy. 



Voluta (Pterospira) hannafordi, M'Coy. 



1874. rolnta hannafordi, M'Coy, Prod. Pal. Vict. dec. i. p. 23, pi. vi. 



fig. 1. 

 1876. Voluta hannafordi, M'Coy, id. dec. iv. p. 25, pi. xxxvii. fig. 1. 

 1889. Voluta hannafordi, Tate, Trans. Roy. Soc. South Aust. vol. xi. p. 121. 



Distinguished by its immense, inflated protoconch (Plate IV. 

 rigs. lOa-i), and the wing-like expansion of the outer margin 

 of the aperture. The whorls are obtusely angulate, crowned by 

 nodose tubercles, which near the summit appear as rugose costae. 

 In the young of this species the last whorl is spirally liueate, the 

 lines being close together in the neighbourhood of the suture and 

 towards the anterior portion of the columella, and more distant 

 between those two points ; in the adult the anterior part of the 

 whorl is smooth ; the columella has three plications. 



It differs from its congeners V. macraptera, M'Coy, and 

 V. mortani, Tate, in that the whorls of the latter are practically 

 smooth, though all possess the wing-like expansion. The present 

 writer is unable to speak as to the precise character of the 



1 tTTepiv ' wing ' ; cnrupa ' volute.' 



