— 933 — 
bique excentrica, sed versus apices sublaterali, area centrali hyalina, 
inaequilaterali, 3,5 lat., areis hyalinis terrninalibus subrotundalis vel 
ellipticis, 2 fx diani. acute, limitalis : slriis bene defiiiitis circa aream 
centralem hyalinam radiantibus scu Iransversis, demum apices versus 
obliquis ; striis rectis vel Ionissime subarcuatis, 10 in 10 [t.. 
Hab. in depositu « North Tolstoa Lewis ». 
1122. JX. obtusa Sm. 
var. lata Raltr. ~ Diat, North Tolstoa p. 422, t. XXIX, f. 1 a-h. 
Valvis ellipticis, 42,5^18,7, apicibus leniter protrusis, obtusissimis: 
5 y. longis, flexura marginali inter areas medianam et terminalem leni ; 
striis subtibssimis 12 in 10 [x, maxime ex parte transverse parallelis, 
apices versus subobliquis ; area centrali subelliptica hyalina ; areis 
hyalinis terminalibus subrotundis, 4,3 diam. distinctis, rhaphe mediana 
haud bene definita, nodulis centrali terminalibusque minutissimis: zona 
connectiva lata. 
Hab. fossilis in depositu « North Tolstoa Lewis ». 
1123. I¥. obloii§^a var. ^ubparalella Raltr. — Diai. 
North Tolstoa p. 425, t. XXÌX, f. 2. 
Valvis 90 « 10 margine subrectis apices rotundatos versus leniter 
attenuatis ; areolis terminalibus ovatis, 2,8[xlatis apicibus valde adpres- 
sis; spatio centrali hyalino elliptico; costis ut in type, apices versus 
obhquis ; striis 10-12 in 10 {x, 
Hab. fossihs in depositu « Norlh Tolstoa Lewis ». 
1124. M. cardinaliis» (Ehrenb.). 
var. |§»U beo II intrici a Rattr. — Diat. North Tolstoa p. 426, 
t. XXIX, f. 3. 
Valvis 82,5 ^ 12,5, apicibus constrictione distincte definita a cetera 
valvae parte discretis, spatiis hyahnis terminalibus subrotundis, "iSi^ diam., 
marginalibus, costis transversis et obliquis, rectis vel subarcuatis et se- 
cus margines non undulatis ; spatio hyalino centrali 6,2 '«^ 5 ; striis 12 
in 10 i^. 
Hab. fossihs in depositu « North Tolstoa Lewis ». 
1125. P^eudauliscu^ rotatui» Rattray. — Bevis. of 
Auliscus in Journ. R. Micr. Soc. 1888, p. 907, t. 16, f. 7. 
Gircularis, 75 diam. ; superficie subplana, area centrali nitida, 
pentagonali, lateribus profunde extrorsum concavis, angulis obtusis usque 
ad latus interius processuum productis ; punctis minutis, obscuris, inor- 
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