REPOET ON THE FORAMINIFERA. 
631 
the whole of the convolutions being visible on both sides of the test. Shell-wall very 
thin ; perforations apparently confined to the superior surface, sometimes arranged in a 
more or less regular single row, sometimes obscure. Longer diameter about -^jtli inch 
(0‘3 mm.). 
Spirillina obconica occurs with some of its congeners off Prince Edward Island, 
50 to 150 fathoms ; in Christmas Harbour, Kerguelen Island, 120 fathoms ; and in Nares 
Harbour, Admiralty Islands, 17 fathoms. 
Spirillina incequalis, H. B. Brady (PI. LXXXY. figs. 8-11). 
Spirillina. incequalis, Brady, 1879, Quart. Journ. Micr. Sci., vol. xix., N. S., p. 278, pi. viii. 
fig. 25, a.b. 
Test free or adherent, discoidal, relatively thick ; consisting of four or five convolu- 
tions ; inferior (adherent) surface flat, broader than the superior ; superior face concave, 
or excavated at the umbilicus ; periphery oblique, margin acute or subcarinate. Shell- 
wall coarsely perforated ; surface uneven, often decked with slightly raised bosses or 
tubercles. Diameter -^>th inch (0'3 mm.). 
Compared with the typical Spirillina vivipara this species presents, as a rule, a some- 
what smaller and thicker shell, with sloping instead of rounded peripheral wall. The form 
of the shell and the appearance of the basal surface suggest a parasitic habit ; and from 
the circumstances under which it has been found it seems probable that it grows attached 
to shreds of algae or similar soft organic bodies. The extension of the margin of the 
inferior side is mainly due to the increased substance of the shell-wall, which on the 
upper face remains thin, perforate, and delicately transparent. 
Spirillina incequalis has been observed in shallow-water dredgings from several of 
the island groups of the Pacific, namely : — off Honolulu, Sandwich Islands, 40 fathoms ; 
Nares Harbour, Admiralty Islands, 17 fathoms; off Tongatabu, Friendly Islands, 18 
fathoms; off Fiji Islands, 12 fathoms ; and off Bain e Island, Torres Strait, 155 fathoms. 
Spirillina tuberculata, H. B. Brady (PI. LXXXY. figs. 12-16). 
Spirillina tuberculata, Brady, 1878 (in Siddall’s — Foraminifera of the Dee), Proc. Chester Soc. 
Nat. Sci., pt. ii. p. 50. 
,, ,, Id. 1879, Quart. Journ. Micr. Sci., vol. xix. p. 279, pi. viii. fig. 28, a.b. 
Test free, planospiral, seldom quite symmetrically coiled ; peripheral edge rounded or 
(in small specimens) somewhat square. Surface more or less covered with exogenous 
deposit, which often fills the sutural depressions, except that bounding the final convolu- 
tion ; the exterior of the whole shell beset with well-defined raised tubercles, which are 
