Greville_, on the genus Auliscus. 
51 
are likewise remotely scattered over the surface of the valve, 
which, in certain lights, resemble diaphamous points, and are 
very liable to be passed over. Specimens, however, sometimes 
occur in which these raised points are very numerous and 
visible, and towards the margin especially, give quite a rough 
appearance to the valve. 
^■^^ Radiating lines, exceedingly fine and crowded, and 
sometimes more or less very minutely granulose. Valve 
strictly circular. 
Auliscus Macrceanus, n. sp., Grev. — Valve circular, with a 
thick, prominent margin, and small, indistinct umbilicus; 
radiating lines all exceedingly fine; minute intra-marginal 
puncta scattered between the large, broadly-oval processes. 
Diameter -0040". (Fig. 18.) 
Hab. Ceylon; Dr. Macrae. 
One of the finest of Dr. Macrae's discoveries in the Indian 
seas, and strikingly distinct. The processes are very large, 
and touch the margin, which is highly raised. A row of 
minute puncta is situated immediately within the margin, and 
halfway between the processes additional puncta form an 
irregular belt, while two little clusters on each side are found 
midway between the margin and the centre. 
Auliscus elaboratus, n. sp., Ealfs, MS. — Valve circular; 
centre minutely granular, giving off* numerous very fine con- 
verging lines, which, as they approach the processes, are in- 
terrupted by a circular ridge, surrounding at some distance 
each process ; whole surface more or less minutely granular. 
Diameter -0044''. (Fig. 19.) 
Hab. Barbadoes deposit (Cambridge estate) ; kindly com- 
municated by Mr. Ralfs. 
A most peculiar species. The radiating lines excessively 
fine; the centre completely filled up with a minute granula- 
tion. Processes in the specimens now before me three ; each 
surrounded by a circular ridge, which encloses a space about 
as broad as the diameter of the processes themselves; and 
the fine lines passing over the ridge catch the light, or pro- 
duce a slight shadow, and thus cause the appearance of a sort 
of halo round each process. 
Auliscus JohnsonianuSj n. sp., Grev. — Valve circular, wdth 
minutely granular centre, and very fine, obscure, converging 
lines ; processes (4) with striated border. Diameter -0034". 
(Fig. 20.) 
Hab. Barbadoes deposit (Cambridge estate) ; C. Johnson, 
Esq. 
The striated border of the processes is of itself sufficient to 
mark this species ; but it is also distinguished (if the cha- 
