666 
Proceedings of Royal Society of Edinburgh. [sess. 
delicate; intervals expanding gradually outwards, and reaching 
border ; their inner ends uniformly curved away from one another, 
closed, and continued almost to the angles of the centro-lateral area ; 
opposite this area and at middle of largest compartments 5 short 
rays, the two lateral longest, attenuating outwards, and with the 
inner ends slightly swollen and knob-like, the subobsolete interval 
nearer one of the larger intervals than the other, not reaching the 
border. 
Allied to A. arachne. 
Habitat. — Nancoori deposit (Grunow). 
Asterom. sarcophagus. Wallich, Trans. Alter. Soc. Lond., 1860, 
p. 47, pi. ii. fig. 12. — Subregularly oblong, the sides slightly 
concave about their middle, the concavities of those adjacent to the 
subobsolete interval greater than the others. Length "045, breadth 
*0225 mm. Centro-lateral area expanding gradually outwards. 
Markings : rays 6, suhuniformly arcuate, the three from each side 
uniting in two excentric points, which are connected by a short 
transverse line at right angles to the major axis ; the compartments 
reaching from jr to •§- of radius inwards, unequal, but symmetrical 
with respect to the major axis, their inner ends convex; areolae 
distinct, 4-J (V) in *01 mm., in obscure radial rows; the intervals 
attenuating outwards, their outer ends convex outwards, close to the 
border. — Asterolampra sarcophagus , Grev., Trans. Micr. Soc. Lord ., 
1860, p. 124. 
Distinguished from A. arachne , its nearest ally, by its outline, 
and the different character of its rays and compartments. 
Habitat. — Indian Ocean (Wallich). 
The following species from Peruvian guano have been founded 
on the number of the rays on the central portion of the valve, and 
cannot he retained : — 
A. denarius. Janisch. ( Abh . Schl. Ges. voter. Cult., 1860, p. 
160, pi. ii. b. fig. 22 — unpublished). Oval. Diam. -045 mm. 
Rays 10, straight. Areolae small. 
A. Brebisonii. Janisch (ibid., 1861, p. 160, pi. ii. b. fig. 28 — 
unpublished). Rays 12, straight. Areolae small, on compartments 
adjacent to subobsolete interval. 
A. Pringsheimii. Janisch {ibid., 1861, p. 160, pi. ii. b. fig. 25 
