CRETACEOUS CILIOPODA 
2t. 
fibrous string to a preceding joint. The number of longitudinal sci’ics of cells 
varies according to the age and respective tliickness of each stem, usually it falls 
between eight and twelve. Each cell is somewhat elongately hexagonal, rather con- 
tracted in the lower half, smooth, and surrounded with a more or less cleA’ated 
margin, which is common to the adjoining cells. The aperture is ovate and slightlv 
sunken. Ovicells placed above the aperture have in very few instances been observed. 
Localily. — Yermanoor, in a soft yellowish sandstone. 
Formation . — Arrialoor gi’oup. 
XI. Genus. — PLAXICELLAEIA, eVOrhiyny, 1851, (sec p. 23). 
1. Plaxicellakia oerLATA, iVOrhiyny, PI. II, Pigs. 7-8. 
1851. Planicellaria oculata, d’Orbigny, Pal. I’raiif., terr. cret., vol. v, p. 37, pi, 053, fi"s. 1 — 5. 
.. ? >. fcmstmla, „ „ „ „ „ „ „ G— 9. 
PI. ramulis comprcssiuscuUs, lateraliter anyuste ohtusis ; eellulis elliptiGis, in- 
crassalis, sulcis levihus indislinclis separaiis, medio aperlura piarva, ovata, pjerforatis ; 
aviculariis j)arvis, plus minusce tuhulose projicienlihus, uno lyteri mediano externa 
sinyulce cellulce opjwsito. 
Cellnlis erosis apertura permayna elonyata instructis (P. fenestrata, d’ Orb. J. 
I have only two fragments of this remarkable species before me. They evi- 
dently rcin-esent one and the same species. One (fig. 8) is better preserved, and its 
cells agree with those of d’Orhigny’s P. oculata, being surrounded by a kind of 
swelling of an elliptical sha])C, in the middle perforated by a comparatively small 
ovate aperture, and separated from each other by slight smooth depressions. The 
avicularia, placed laterally opposite the middle of the external lateral margin of 
each cell, are only slightly prominent, and Avith round openings. 
The other fragment is evidently mnch worn on its surface, more so on one 
thaii on the other side ; nearly the whole of the swollen portion of the cells loimd 
the aperture is broken in, and thus the stem attains an entirely different aspect, 
being at the same time also apjAarcntly flatter than the other one. In this stage 
the branch is almost identical with d’Orhigny’s P. fenestrata. There can he 
no doubt that the two forms merely represent differently preserved stems helongins,' 
to the same species, and as d’Orhigny gives an exactly corresponding difference 
between his P. oculata and fenestrata, I must only conclude that they belong with 
the greatest probability to one and the same species. D’Orhigny’s .sjiccimens also 
were from one and the same locality, the Senonicn beds in the neighbourhood of 
Ndhou (Manche), and he adds that the species is rare. I may state the same of 
its occurrence in India. 
Locality. — Yermanoor, in a ycdlowish soft sandstone. 
Formation . — Arrialoor gronp. 
(• 58 ) 
