199 
vated at the umbilicus; periphery rounded. Linear portion 
cylindrical, or oval in transverse section, slightly increasing in 
size towards the oral extremity. Segments about ten in num- 
ber, inflated. Sutural lines marked by deep incisions. Test 
coarsely arenaceous. Aperture simple, central; marked by 
umbo produced from central portion of final segment. 
Length of large specimen, } in. 
This form differs from H. agglutinans (d’Orb.), with which it 
has close affinities, in the deep constrictions of the sutures, infla- 
tion of the chambers, and prominent oral features. The strongly- 
marked septation in the spiral portion gives an appearance to the 
chambers as though set at different angles, and thus opposed to 
each other in the plane of growth. 
H., agglutinans is also present in the same beds, but no passage 
forms were noted between this last-named species and the one 
now described. 
One example was found in No. 1 Bore at a depth between 100 
ft. and 200 ft., and about half-a-dozen in No. 2 Bore at a depth 
of 50 ft. 
PATELLINA JONESI, sp. nov. Pl. x., figs. 9-11. 
Ref.—Patellina Jonesi, How., MS. Report of Fifth Meeting of 
Aus. Ass. for Adv. of Science, Adelaide, 1893, page 365. 
Test free; superior lateral surface an elongated obtusely 
pointed cone ; usually asymmetrical ; inferior face flat or slightly 
concave ; height equal to greatest breadth, or more; peripheral 
edge, obtuse, rounded. Segments, of which there are about seven 
on either side, cresentic (or? annular); irregular both in size and 
position. Superior surface, punctured and minutely reticulated 
with] ines of clear shell substance. Septation often indistinct exter- 
iorly, but sometimes marked by slight sutural depressions or 
swellings of the test in irregular gyrate elevations. Chamber 
cavities simple, undivided by septa. Central portion of test 
filled with irregular growth of shell substance, which also pene- 
trates to a great extent the chamber cavities themselves. 
Height of cone in average specimens, 4, in.; diameter, =, in. 
This is an anomalous little shell. It appears to be a Patellina 
of a very simple type. In external form it somewhat resembles 
the recent and very rare P. campaneformis, Brady, and still more 
closely the conical, Carboniferous form, P. Bradyana, Howchin, 
and is akin to both these species in its simple undivided cham- 
bers. But it differs from both the species referred to in the 
irregular form of its chambers and the generally diffused shelly 
deposits within the chambers as well as in the umbilical region. 
Tn the examination of minute fossil forms there is always a danger 
of confounding infiltration of mineral matter with the proper 
testaceous structure, but in the examination of transparent 
sections of this form it is often impossible to mark the distinc, 
