GrevillEj on Asterolamprce. 
53 
Hab. Barbadoes deposit ; extremely rare. 
This ornamental little species is well marked by the single, 
large wedge-shaped cellule at each angle of the inner margin 
of the segments, and which is connivent at its inner extremity 
with the cellules of the adjoining segments. The thickened 
edging of the segments is also extended round the cellules. 
17. Asterolampra pulchra, n. sp. Grev. — Nucleus punctato- 
cribriform (always ?) ; umbilical lines robust ; ray-tubes con- 
spicuous, with one or two gland-like pores at their marginal 
terminations. Diameter about -0025". (Figs. 37, 38.) 
Hab. Barbadoes deposit ; rare. 
A singularly beautiful object, and perfectly distinct. The 
frustules are remarkable for the prominence of the ray-tubes, 
which, being actually as conspicuous as the umbilical lines, 
produce at first sight no little confusion, looking like wheels 
with two sets of spokes. The ray-tubes, in fact, are even 
more conspicuous than the umbilical lines, because they ap- 
pear as if they were continued to the very margin of the 
valve, which is probably the case, the narrow portion of the 
ray being in this instance the ray-tube itself. By attentively 
observing the nucleus, the eye is able to trace the diflPerence, 
the umbilical lines being given off from the substance of the 
nucleus, and being also darker and less broad. Both the spe- 
cimens figured, it will be perceived, are slightly polygonal, a 
character not unfrequent among the Liostephanice, and which 
enters into the generic definition of Actinogonium, Another 
feature also makes its appearance here for the first time. I 
refer to the gland-like pore at the extremity of the rays. In 
one of the frustules there is only one pore on one side of the 
end of the ray. In the other there are two, the ray termi- 
nating between them. Certain other differences exist in these 
two specimens, but I am doubtful whether they are of suffi- 
cient importance to separate them. In fig. 37, the segments 
have an ornamental row of oblong puncta within their inner 
margin. In fig. 38, the segments are solid. It would re- 
quire a suite of examples to determine the value of such 
variations ; for in this genus characters cannot be taken in 
the different species from the same parts. 
18. Asterolampra Kittoniana, n.sp. Grev. — Small ; nucleus 
punctato-cribriform umbilical lines thick ; segments smooth, 
with a gland-like pore at their lateral margin, on each side of 
the middle of the narrow portion of the ray. Diameter '0018". 
(Fig. 39.) 
Hab. Barbadoes deposit ; Frederick Kitton, Esq. 
For a drawing of this elegant little species I am indebted 
to my very obliging correspondent, Mr. Kitton, of Norwich, 
