Greville^ on Aster olampr(B. 
55 
say, because at fig. 43 I give a figure from a specimen of my 
own, in which the valve seems to be fully developed as to 
size, while the ray is in as elementary a condition as in fig. 
42. In this state, there is no prolongation whatever of the 
ray beyond the broad portion, which constitutes the hyaline 
area ; and the ray-tubes are so prominent as to cause an 
elevated, rounded ridge. Each of the rays in this condition 
might be correctly defined as cordate and 3-lobed. A some- 
what more developed state is shown at fig. 44, where the rays 
begin to be slightly prolonged, and a gland-like pore occurs 
on one side of the extremity of each ray. In fig. 45 the ray 
has attained its normal length, and the valve has assumed 
more of the Asterolampoid character; only the umbilical 
lines are much broader than in any previously described 
species. There is some little difi'erence in the shape of the 
base of the rays, the angles being sharper, rendering the 
term cordate scarcely applicable. It is an approach to the 
form of the ray exhibited in the following species. Possibly 
future investigations may show that this is distinct, for a 
difi'erence also exists in the gland-like pores, those which 
are seen in fig. 44 being absent in the present disc, while 
there are indications of a pore near the margin of the valve, 
opposite the umbilical lines. Three such pores are visible in 
the valve figured (the only one which has been found). In 
the meantime, being averse from adding to the number of 
species on too light grounds, I prefer to notice it as a doubt- 
ful variety. 
22. Asterolampra? aliena, n. sp., Grev. — Valve with a 
broad, thickened border; nucleus with a central pore; um- 
bilical lines very broad ; bases of the rays contracted into a 
deltoid-lanceolate figure, the narrow portion terminating in 
a gland- like pore. Diameter -0024". (Fig. 46.) 
Hab. — Barbadoes deposit ; very rare. 
In this valve the umbilical lines are so broad as to lose 
much of their primary character, and the rays, consequently, 
bear a smaller proportion to the rest of the space in the frus- 
tule than in the other species. The points of the rays next 
the centre are very acute; the ray tube visible, but very 
narrow, and the pore at the marginal extremity very con- 
spicuous and brilliant. 
