their neighbours completely, so as to pro- 
duce a costa of double thickness ........ a. Andrioporine. 
LB. Costz are more or less flattened and bear a 
median row of pores ; a costa occasionally 
completely fuses with its neighbour, form- 
ing a costa of double width ............ b. Phophleine. 
C. Coste bear a median slit ...... eign ale wie. @. Schistacanthoporine. 
a, ANDRIOPORIN#, Subfam. nov. 
382 Mr. W. D. Lang—Revision of the 
Tabular Diagnoses of the Genera. 
A. Uniserial, incrusting. 
I. Avicularia generally present ; intraterminal 
front wall simply arched and costz more 
OF ABSS Used wie tae e erelee igs iets 1. Andriopora 
II. Avicularia absent ; intraterminal front wall 
entirely fused, traces only of the cost 
remaining, and apertural bar forming a 
hun as ee ere ae Sine atone me If. Corymbopora. 
B. Multiserial (except sometimes in neanastic 
stages), incrusting. 
J. No secondary aperture. 
a. Median area of fusion not surrounded by 
a circle of spines. 
1. Apertural bar not forming a hump. 
a, Avicularia numerous or, if few, not 
medianly placed. 
I. Furrows between costz plainly visible. 
a, Apertural spines not markedly thick- 
ened. 
1, Apertural bar not flattened and pro- 
duced vertically, so as to form a 
rudimentary proximal shield. 
a. Apertures very primitive (subsemi- 
ejrenlar) . dans <s tt Be eet eves III. Polyceratopora. 
8. Apertures not very primitive. 
a. Larger, not so squat,and apertural 
spines not at all thickened ...... IV. Argopora. 
b. Smaller, squat, and apertural 
spines slightly thickened. 
1. (Ecia not separated by much 
circum-avicularian tissue .,.... V. Nannopora. 
2, CEcia separated by much circum- 
avicularian tissue (? keneecia) .. VI. Distansescharella. 
2. Apertural bar much flattened verti- 
cally, forming a rudimentary proxi- 
mialshield' strc = ete tsie cae ee VIL. Angelopora. 
b. Apertural spines decidedly thickened. 
1. Apertural bar produced into a 
MeGsAN SPO care see Rie tae 9 lel se ei VIII. Euchetlopora. 
2. Apertural bar not produced into a 
median spine. 
as Avicularia absent sp: Msi. cee IX. Kankopora. 
8. Avicularia few, pointed.......... X. Oligotopora. 
