from the Island of Malta. 77 
rather nearer the anterior than the posterior border. The disc 
consists of a central madreporiform spongy body, around which 
the geuital and ocular plates are arranged in a circle; their 
sutural lines of union, however, are concealed, and can only be 
seen in weathered specimens. The base is convex; the mouth 
is very large, and lies in a deep depression opposite the vertex ; 
it is surrounded with five oral lobes of small size, with inter- 
vening petaloidal depressions, perforated with holes in pairs. 
The interambulacrum is slightly produced posteriorly. The 
anus is a large transversely oblong opening, situated near the 
margin. The border of the test is rather obtuse. ‘The tubercles 
are of uniform size on the dorsum, and are larger and less 
numerous than in #. Kleinii. 
Affinities and differences.—This species resembles much E. 
scutiformis, but is distinguished from it by the greater narrowness 
of the ambulacral areas, and the absence of the transverse slits 
or sulci by which the pairs of pores in these avenues are in 
general united. The tubercles are more abundant on the dorsal 
surface in H. Deshayesii, and the dorsal surface is not so much 
elevated in that species as it is in E. scutiformis. 
Locality and stratigraphical range-—This species was col- 
lected from bed No. 2, the yellow sand, at Malta. Desor gives 
the “Tert. moyen. d’Oran (Algérie) et de Carthagéne (Cata- 
logue)” as his localities ; and we have received from M. Michelin 
of Paris a specimen from the Miocene terrain of Balistro, Cor- 
sica, which has enabled us to identify the Maltese Urchin, and 
make out the preceding description, the first given of this pretty 
form. 
Echinolampas Richardi, Desmarest. 
Syn. Scutum ovatum Issyaviense, Klein, Echinodermatum, tab. 20. 
fig. a, 6, § 77. p. 29(2). 
Clypeaster Richardi, Desm. Dict. Se. Nat. t. liv. tab. 5. p. 12, spec. 
ined. in litt. ; Grateloup, Mem. Echin. Foss. tab. 1. fig. 8 a, 8, 
p. 44. 
Lichinolampas Richardi, Desmoulins, Etudes sur les Echinides, p.342. 
no. 4. 
Echinolampas Laurillardi, Agassiz and Desor, Ann. Sc. Nat. t. vii. 
p- 165.—Scilla, Corp. Mar. tab. 11, top figure, showing the base 
only. 
Test oblong, produced posteriorly, rounded before, flattened 
laterally, caudate posteriorly ; dorsal surface convex, elevated ; 
base concave ; mouth central; anus inframarginal, lodged in 
a caudal process of the interambulacrum ; ambulacral areas 
narrow, with contracted poriferous zones. 
Dimensions.—Antero-posterior diameter 1,4 inch, transverse 
diameter 1,9, inch, height }7ths of an inch. 
