growth-striae, slightly stronger at irregular intervals, rendering the surface folded, but forming- 

 no ribs, and a few indistinct varices ; spiral sculpture : a fine raised line at some distance below 

 the suture, a few distant, impressed striae at the lower part of each whorl and very fine 

 microscopic striae on the whole surface; last whorl with abouth i6 impressed striae, beginning 

 a little above the periphery, becoming stronger near the base. Aperture strongly broken, part 

 of the outer and even of the columellar margin wanting. Outer margin probably thin, regularly 

 curved, columellar margin rather straight above, tortuous below, reflected towards the left. 

 Shape of aperture, as far as may be judged, elongate, acutely angular above. 



Alt. 8^4 (but may have been more), lat. 3 ; apert. alt. 4^4 Mill. 



A very puzzling specimen, and were it not for it peculiar characters, I should not have 

 named and described it; in shape it resembles 5". Metcalfei A. Ads., but it is more ventricose 

 than my specimens of that species from Lifu, with a much longer last whorl, a different suture, 

 nay, differing in every particular. Its spiral striation is an exceptional feature in the genus, and 

 it is much to be regretted, that the base of columella is wanting, for if this were present, it 

 might prove to be bent towards the left and backwards, which would locate the species in the 

 genus or subgenus Bactila H. and A. Adams (1863) containing Arcuella mirifica Nevill (Journ. 

 Beng. Soc. Vol. 43, 1874, PI. i, fig. 10, copied by Tryon Man. of Conch. Vol. VIII, PI. 70, 

 fig. 70) which latter species is also spirally striated, with- a distinct subsutural zone; but though 

 the columella is tortuous below and so it might be that it would terminate in an angle of the 

 same construction as that of B. mirifica-^ this seems to be too bold a supposition, to locate 

 it in that genus. Untill fresh or at least complete specimens have been collected, this species 

 will remain one of the numerous enigmas amongst the difficult Gymnoglossa. If it has really lived 

 at the great depth of 1886 M., the probability of getting more materials, will not be very great. 



Niso Risso. 



I. Niso venosa Sowerby. 



SowERBY. Proc. Mai. Soc. Lond. Vol. I, 1S95, p. 279, PI. 18, fig. 10, 11. 



Stat. 4. Djangkar (Java). 9 M. Coarse sand. I Spec. 



Stat. 51. Madura-bay, 69 — 91 M. Fine grey sand, coarse sand with shells and stones, i Spec. 



Both specimens are very young and it is only by comparison with a specimen from 

 the original locality, received from the author, that I was able to identify them. The smallest 

 specimen, from Stat. 51, has only a length of 5Y3 Mill, and but very faint traces of "the bright 

 reddish-brown, vein-like lines which here and there cross the whorls". Indeed I see but one brown 

 line at the upper part of the aperture and two short lines below the suture of the last whorl, 

 the upper whorls being uniformly white, with the spiral, supra-sutural line, which even is wanting 

 on the uppermost whorls. However this is also the case in the typical specimens, as far as may 

 be judged after one specimen that has lost its nuclear whorls. The specimen from Stat. 4 is a 

 slightly bleached shell. Clessin seems not to have noticed this species though his monograph 

 has been published in 1902. 



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