OF SOUTHERN INDIA. 
41 
The Ecijiyw/E are known from the beginning of the middle Jurassic deposits 
up to the present time, gradually increasing in number and richness of forms. In 
the Jurassic deposits five genera occiu-, in the cretaceous seven, in the tertiary twelve, 
and the remainder in the present epoch, in addition to seven genera which are found 
both in fossil and recent state. 
XIII. MICROPEDINA, Cotteau, 1866. 
Cotteau, Pal. Fran 9 . terr. cret., vol. vii, p. 822 . 
Test of moderate size, inflated, with the primary tubercles numerous, arranged 
in transverse, almost parallel series, equal on both the ambulacral and interambu- 
lacral areas, slightly prominent, smooth and perforated ; poriferous zones narrow, 
with the pores in single pairs, almost regularly placed under each other, and in three 
pairs to each ambulacral plate. Peristome round, with small incisions. Anus rather 
large, subelliptical, surrounded by the five genital plates and much smaller oeular 
plates, both being finely granular. 
These charaeters readily distinguish the present genus from all other EciiiNinji. 
There is as yet only a single species known from the Senouien beds of Algeria, 
31. Cotteaui, Coquand. 
1. — Mickopedina SPUyERoiDES, StoUczka. PI. VI, Fig. 7. 
31. testa sphceroidali, infra paulimi convexiusoula ; aperturd parva, incisionihus 
niarginalibus brevibus histructa ; zonis poriferis awjustis atque rectis, ports regular i- 
bus, approximatis ; tuberculis ambulacralibus interse cequalibus, atque in superficie 
supera paulo minoribus quam in infera, quaque tabula ambul. ad peripheriam tuberculis 
qjrimariis quatuor, quaque tabula inter-ambul. tub. decern in ordine singulo ornata, 
tid)ereulis perforutis, modice elecatis, areolis distinctis pohjgonis circumdutis, inter- 
spatiis minutissime crenulatis. 
Test somewhat depressedly spheroidal, with the base slightly convex, and the 
aperture comparatively very small, circular, and with short but distinct incisions. 
The poriferous zones very narrow, straight from the apex to the aperture, witli the 
pairs of pores regularly placed under each other, only the lowest pair opposite each 
ambulacral plate is somewhat iuAvardly situated, and sometimes, though very rarely, 
there is a third pore added to the two others. In the figured specimen the test is 
only preserved on the lower side, but in another smaller specimen, which to all 
appearance belongs to the same species, the pores are equally regular on the upper 
side as they are on the lower. The width of the ambulacra at the periphery is two- 
fifths of that of the iuterambulacra, the primary tubercles on both quite equal, 
slightly larger on the lower than on the upper side. At the periphery there are four 
alternate primary tubercles on each ambulacral plate, and about ten on each iuter- 
( 111 ) 
