Greville^ on Aster olamprce. 
47 
tions of the rays grouped with the adjoining cellules. The 
latter are extremely large^ with their walls strong, and 
sharply defined. The remainder of the surface of the seg- 
ments is very minutely punctate. A shade caused by the 
ray-tube adds greatly to the rich effect of the whole. 
6. Asterolampra crenata, n. sp., Grev. — Segments with 
their inner margin following the curve of the valve, and 
crenate with the terminations of the large subequal cellules. 
Diameter, -0020" to '0039'', (Fig. 14—16.) 
Hab. Barbadoes deposit; T. G. Rylands, R. K. G. 
Allied to A. vulgaris, but differs in the even row of equal 
cellules which forms the inner margin of the segments. The 
number of rays vary from six to eight, and in the series of 
specimens which I have examined, these numbers bear about 
an equal proportion to each other. Not a single example has 
occurred with umbilical cellules, which are frequent in A, 
vulgaris. 
Lateral cellules of the segments projecting more or 
less beyond the rest. 
7. Asterolampra vulgaris, n. sp., Grev. — Segments having 
the inner margin composed of large oblong or linear cellules, 
the lateral ones projecting more or less beyond the rest ; 
umbilicus centrical, simple, or cellulose. Diameter '0012" to 
•0043". (Figs. 17 to 25.) 
Var, a. — Lateral cellules of the segments linear-oblong or 
linear, projecting considerably beyond the rest ; umbilicus 
either simple or cellulose. (Figs. 17 — 20. 
Var. b. — Lateral cellules of the segments linear, straight, 
projecting considerably beyond the rest, and so close to each 
other as to render the narrow portion of the ray quite obsolete. 
(Pig. 31.) 
Var. c. — Lateral cellules of the segments linear- oblong, 
slightly obovate and inclined at the apex, only slightly pro- 
jecting beyond the rest ; umbilicus simple or cellulose. 
(Fig. 22.) 
Var. d. — Cellules of the inner margin of the segments 
linear, the lateral ones slightly projecting ; rays numerous, 
and the umbilicus widely cellulose. (Figs. 23, 24.) 
Var. e. — Cellules of the inner margin of the segments 
linear, the middle ones twice as long as the minutely 
punctate portion, the lateral ones shortly projecting; um- 
bilicus (always ?) cellulose. (Fig. 25.) 
Hab. Barbadoes deposit ; common. Vars. b, c, and e, rare ; 
Var. a found also in Atlantic deep sea soundings; T. G. 
Rylands. 
VOL. X. d 
