KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 52. wN:o [6. 43 
—80 feet (*/7, '°/7), 4 sps, max. 1. 18 mm (shell). The colour of the largest animal 
is light brownish with black dots, which are confluent to radiating stripes. The 
distribution is very wide: from Persian Gulf and Red Sea to Cape of Good Hope, 
Japan, Philippines, New Caledonia, and Australia (MeLvILL & SranpeNn 1901, Pirs- 
BRY 1890), 
FAM, STOMATELLIDAE. 
Gena strigosa A. Apams, var, minor n. var. (Pl. 1, figs 36, 37, text fig. 7). 
45 miles W. S. W., 66 feet ('°/7), 2 sps, max. 1. 7.5, br. 4.3, h. 2.4 mm; whorls 4. 
The two specimens differ neither in colour (light reddish, alternating dark red and ~ 
yellow spots at the suture and the columellar margin) nor in sculpture (dense, 
unequal striae, higher up elevated threads) nor in shape from the typical G. strigosa 
> el 
RMU a 
" 
| 
AN W lH f | { 
w SW Shell \ I/| | Min ii ff aft 
Fig. 7. Radula of Gena strigosa var. minor. X 200. 
from Port Jackson (specimens in R. M. compared), only the size differs, inasmuch 
as the type measures about 10.5 mm in length and 6.3 mm in breadth by 4 whorls; 
when smaller it becomes even broader relatively to its length. — The animal of 
the present variety has a strong foot with short fringed epipodial cirri; further 
there exists on each side of the neck a »water conduit», characteristics which are 
confined to the subgenus Plocamotis Fiscuer according to Pruspry (Man. of Conch., 
Vol. XII, 1890). The typical G. strigosa is only known from Port Jackson and from 
the Chagos Archipelago (MELVILL 1909). 
The radula (fig. 7) has the formula © .1.5.1.5.1.0. Median tooth with a 
small apex and 3 denticles on each side of it; the laterals increasing in size outwardly, 
each with 3 denticles on the sides of their cusps; in the outermost lateral the two 
anterior denticles in the outer edge are united; outside the laterals an incomplete 
transitional tooth; uncini more than one hundred, the inner ones with large spoon- 
like heads, with one strong denticle on each side of the base; tooth 10 and the 
sequent ones with 3 or more denticles, which, like the apices, successively diminish 
in size and increase in number; teeth from about 60 with reduced apices and smooth, 
abruptly truncated upper ends. 
