219 



cate anteriorly. Inner lip thin from columella to posterior 

 sinus, smooth. Interior of aperture smooth. Umbilicus deep, 

 small, margined with oblique plicate tubercles. 



Dim. — Alt., 3'6 mm. ; diam., 3'4 mm. 



Locality.— ^h.Q\\ figured and described (in Dr. Verco's 

 collection), witii four others, dredged, dead, 130 fathoms, off 

 Cape Jaffa ; 300, off Cape Jaffa, seven, immature and broken, 

 and six large and complete, one quite recent. 



0/j.s.— This shell was figured for description as a new 

 species, but Mr. Hedley recognized it as his A^feh^ b/fi.r, which 

 was an immature shell, and did not plainly reveal the aper- 

 tural sinuses. He suggested its location in Watson's genus 

 Basilism, as emended by Dall, in Bull. Mus. of Comp. Zool., 

 1889, pp. 383-385. With this it corresponds closely. One 

 individual shows very well tbe nacreous central claw-like pro- 

 cess in the labrum, somewhat inflected, to which Dall refers. 

 It very probably belongs to the section Anci^frohnsis, Dall, 

 though none of my shells show the internal thickening and 

 grooving of the outer lip ; but Dall points out that this char- 

 acter only occurs in adult shells. 



^^i^fjuevzia radial i^^, Tate, an Eocene fossil from Muddy 

 Creek, the type of which is in the Tate Museum of the Uni- 

 versity of Adelaide, has the two spirals which form the 

 canaliculate suture closer together than our recent form ; it 

 has a prominent spiral threadlet above the second spiral rib 

 and the first spiral rib is absent : so the fossil is less gradate, 

 and the whorls axe more sloping, and have more nearly ^^ni- 

 form spirals. The base is flatter, the perforation and its bor- 

 dering tubercles are larger. Dall, however, in discussing B. 

 cosfulafa, Watson, and var. deprr^.^a, Dall. notes the great 

 variability of abyssal shells in general, and of that species in 

 particular. The same consideration probably holds good in 

 our shell, which has therefore been made only a variety of 

 Tate's fossil species. 



One individual with a perfect aperture shows the labrum 

 to be very irregular, owing to the projection at the border, of 

 every spiral rib and threadlet. into a minute mare"inal tooth, 

 proportional to its size as a spiral, except those which end in 

 the der»th ^f the two labral sinuses. 



Genus Scai.a. Klein. 

 Scala nepeanensis, Gatliff. 



Froo. Roy. Soc., Vict., 1906, vol. xix. (n. s.). Pt. 1, 

 p. 1. PI. ]. fig. o. ''Shell sand. Ocean Beach. Point Nepenn."' 



One example has been found in dredge-siftings, dei^th 

 and locality not noted, probably St. Vincent Gulf. 



