ANIMALS. 53 
ARCHHOCIDARIS VERNEUILIANA, King. Plate VI, figs. 22-24. 
Ciparis, King. De Verneuil, Bull. Soc. Geol. Fr.,2™° série, vol. i, p. 25, 1844. 
— Geol. Russ., vol. 1, p. 221, 1845. 
—  VbrRNEUILIANA, King. Catalogue, pp. 6, 7, 1848. 
= Howse, T. N. F. C., vol. i, p. 261, 1848. 
— Kopysnxriinel, Geinitz. Versteimerungen, p. 16, pl. vii, figs. 1, 2, 1848. 
Diagnosis.—“ Interambulacral plates sub-hexagonal, a little longer transversely than 
longitudinally. Socket-balls large, perforated, placed on elevated bases. Glenoid 
circles radiately crenulated. Muscular areas concave, somewhat broad, surrounded 
with an elliptical border of small tubercles in a single series.” 
The diagnosis of Archeocidaris Vernemlana must still remain imperfect until 
specimens more complete than any I have seen are found. 
Not having discovered any specimens with ambulacra, or more than two contiguous 
rows of interambulacral plates, it is unsafe positively to consider this species as belonging 
to the genus in which it has been placed. ‘The sub-hexagonal form of the plates which 
have fallen under my notice, has principally led me to regard it as an Archeocidaris ; a 
view which seems to be strongly supported by the corresponding form of the inter- 
ambulacrals, in two contiguous rows, figured by Geinitz. 
One of the specimens represented (Pl. VI, fig. 23) exhibits the longitudinal spaces 
between the muscular areas with three or four rows of small tubercles, in addition to 
the “single series” noticed in the diagnosis ; and in the illustrative specimen given by 
Geinitz, there are two intervening rows. Two kinds of spines occur in the rock 
containing this fossil; one is muricated, as in the specimen represented under fig. 24, 
and the other is finely longitudinally striated.” The spine figured by Dr. Geinitz 
appears to be rather different from the one herein represented, but it is probable the 
difference is in the figure, and not in the fossil. 
Archeocidaris Vernemliana is a rare species. The only localities where it is found 
are Tunstall Hill, and Humbleton Quarry, in Shell-limestone. Corbusen, in the under 
Zechstein, is the single German station recorded for it by Geinitz. 
! Catalogue of the Organic Remains of the Permian Rocks of Northumberland and Durham, pp. 6, 7, 
1848. 
* Through an oversight, an error was committed in my ‘Catalogue’ as regards the occurrence of the 
“* transversely-ridged’”’ spine therein mentioned. 
