KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 52. N:o 16. 57 
lengthened and the spire is shorter. "TRYON supposes that this species is synonymous 
with M. obscura REEVE, a form confined to Aden (E. A. SMmitH 1891, M. SMITH 
1913 [in Nautilus]). I am of the same opinion, as the present specimen corresponds 
to the photograph given by M. SmirtH, pl. IV, fig. 16, except that the bands are 
bordered by series of small dots. In shape the specimen before me is exactly inter- 
mediate between the figures given by TATE & MAY and M. SmitH. — Distribution: 
Australia and Tasmania (HEDLEY 1908 b) to Aden. 
FAM. PLEUROTOMIDAE. 
Drillia sexradiata n. sp. (Pl. 2, fig. 59). Shell turreted claviform, whorls 
somewhat convex, separated by a shallow suture, margined by a subsutural cord. 
Aperture about !/s of the height of the shell with broad and short recurved canal 
and a deep subsutural sinus, as well as a slight sinuosity behind the canal. Colu- 
mella straight, with a slight callus at the body wall. Outer lip thickened, simple. 
Sculpture consisting of broad and strong, somewhat oblique, ribs, almost nodiform 
on the upper whorls, decurrent on the body whorl; they number 6 on the last whorl. 
Very fine spiral cords, alternating with finer ones over the whole shell, except for 
the 2 smooth apical whorls. Colour whitish, the interstices between the longitudinal 
folds as well as the columellar margin olive-brown, apex vellowish. Dimensions: 
H. 13, br. 4.4, aperture 5 mm. Whorls 9. Locality: 45 miles W. S. W., 48 feet 
(Ca Sp. 
A total of 6 longitudinal costae is not common in the Pleurotomidae. It occurs 
in Pleurotoma hexagona SoWwWERBY (Central America), Mangilia hexagonalis REEVE (N. 
Australia), Pleurotoma albata E. A. SmitH (Persian Gulf), P. consociata E. A. SMITH 
(W. Africa), and sexcostata E. A. SMITH, Singapore (Ann. Mag. Nat. Hist. ser. 5, 
Vol. 10, 1882), but none of them exhibit the longitudinal brown stripes which alter- 
nate with the broad costae. 
D. varicosa REEvE (Pl. 2, fig. 60). 45 miles W. S. W., 70 feet (”/7), 1 sp. and 
1 dead shell, max. 1. (sp.) 15.5, br. 4.7, aperture h. 6.2 mm; whorls 10. — The shape 
of both shells agrees with the figures given by REEVE (fig. 141 a, b, Conch. Icon. 1, 
Pleurotoma, 1843), which it most nearly approaches also on account of its few varices 
scattered here and there, which are, however, less conspicuous than those described 
and figured by REEVE; the smaller specimen has them somewhat more distinct than 
the larger one. As REEVE's diagnosis is very brief, I give a new description of the 
specimens before me. 
Shell produced, turreted, with somewhat convex whorls, sculptured with a sub- 
nodulous cord and a furrow below the sutures; and with dense and rather narrow, 
somewhat flexuous, longitudinal ribs to the number of about 17, of which one is 
broader, round the last whorl, terminating in obsolete nodules at the subsutural 
groove and decurrent on the last whorl to the canal. Spiral sculpture consisting of 
impressed grooves, the interstices rising as rather coarse cords crossing the ribs; 
subsutural grooves smooth except for faint lines of growth. 'The two apical whorls 
K. Sv. Vet. Akad. Handl. Band. 52. N:o 16. 8 
