50 
CRETACEOUS ECIIINOUERMATA 
by rather wide, shagrcencd iuterspaccs ; they differ conspicuously from the spines 
of other known Cidaris by the great length of the neck, which is longitudinally 
very finely striated, and at the upper end abruptly separated by a raised ring from 
the ribbed and granular body. This peculiar character is indicated in a few imper- 
fect fragments of spines from 
Locality. — Moraviatoor, the specimens having been found in the society of 
C. hiriido. 
Formation. — Ootatoor group. 
C. Faringdonensis is said to be from the Lower Greensand of Faringdon, but 
it is probable that at least a portion of these beds represents a higher horizon, because 
Ter. depressa, Lam., occurs in them, and which is also found in the Ootatoor beds 
of South India. 
5. Cidahis sceptrifera, Mantell. PL VII, Figs. 31 — 36. 
Cotteau, Pal. Fraii 9 . terr. evet., vol. vii, p. 251. 
"Wright, Brit. Cret. Echiuod., p. 54. 
Of this species only one interambulacral plate, with a portion of the poriferous 
zone and the half width of the corresponding amhulacral area, besides a great 
number of spines, were found preserved. The ambulacral area has near the peri- 
phery eight rows of granules, which are gradually reduced to two at the apes ; 
those of the outermost rows are submammillated and larger than the next, but of 
nearly the same size as those in the following row. The poriferous zones are slightly 
flexuous, and the pores lie in distinct grooves. The tubercles of the interambu- 
lacra arc of moderate size, with ratlier extensive miliary zones ; the roAV of about 10 
mammillatcd granules round the areola is very distinct, but the next surrounding 
row is not well defined. The interambulacrum figured on pi. vii shows a slight 
depression near the upper margin, which is also traceable on the plates following 
those in contact with the apical disc of adult specimens, as the one figured by 
AVright (1. c., pi. vi, fig. 1). 
The spines are of the usual elongately fusiform shape, being moderately in- 
flated in the basal third, and then gradually attenuated towards the truncated 
tip. They are ornamented with numerous longitudinal, spinulously granular ribs, 
separated by shagreened depressions ; sometimes the granules become irregularly 
arranged about the middle of the length of the body of the spine. The neck is 
short, very finely striated, and the head is also short, with a moderately prominent 
milled ring. 
In all these characters the spines of the Indian specimens, as well as the single 
interambulacral plate in its largely developed miliary zone, agree with the typical 
original English specimens, Avhile the form of the test figured by Cotteau from 
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