from the Island of Malta. 73 
areas are more equally lanceolate at the base and apex, the 
inner row of pores of the same curve more gracefully outwards, 
and the anus is further from the border in S. Brongniartii than 
in S. subrotunda. The size and pyriform shape of the ambu- 
lacral areas, the absence of sinuosities in the margin, and the 
greater convexity of the dorsal surface, distinguish S. Paulensis 
from S. subrotunda. 
Stratigraphical range and distribution.—This species is not un- 
common in the calcareous sandstone bed No. 4, and in the junc- 
tion beds of No. 5, the hard cherty limestone, at Malta. It is 
found likewise “in the marine calcaire grossier in the environs of 
Bordeaux ; at Bazas, Léognan, Gradignan, Douai, in Dauphiné ; 
in Tourraine ; in Anjou ; at Montpellier.” (Grateloup.) 
History.—The table of synonyms shows the phasis of the 
history of this species, although other forms have been mistaken 
for it: in fact, the species of Scutella approach each other so 
closely, that, without an authentic series of specimens for com- 
parison, similar mistakes may be made. This Urchin is found 
in all the public collections. The specimens before us are from 
Malta and Léognan. 
Scutella striatula, Marcel de Serres. 
Syn. Scutella striatula, Marcel de Serres, Géognosie des Terrains 
Tertiaires, p. 156 ; Desmoulins, Etudes des Echinides, no. 25. 
p. 234 ; Agassiz, Monogr. des Scutelles, tab. 18. fig. 1-5. p. 81; 
Agassiz and Desor’s Cat. raison., Ann. Sc. Nat. tom. vii. p. 134. 
Scutella subrotunda, Grateloup, Mém. Ours. Foss. tab. 1. fig. 1. p.36. 
Test very flat, suborbicular; dorsal surface very slightly convex ; 
ambulacral areas small, short and narrow, Jess than the semi- 
diameter of the disc ; base nearly flat; mouth central; anus 
marginal; ambulacral sulci bifid. 
Dimensions.— Antero-posterior diameter 27% inches, trans- 
verse diameter 2%, inches, height ,4,ths of an inch. 
Description.—This Urchin so nearly resembles S. subrotunda, 
that it may be doubted whether it is entitled to rank as a distinct 
species, or ought rather to be considered as a variety of that 
form. The two specimens before us are from localities widely apart 
from each other. One is from the Miocene terrains of Terre- 
Négre, near Bordeaux, the other from the calcareous sandstone 
of Malta. Still the similarity exhibited by these specimens, and 
the persistence of those characters which have been considered 
as specific, incline us to think that S. striatula may be distinct 
from S. subrotunda. The ambulacral rosette is small; the areas 
are short, narrow and lanceolate, and are less than the semi- 
diameter of the test ; the apical disc is small ; the madreporiform 
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