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THE VOYAGE OF H.M.S. CHALLENGER. 
end to end, and supplemented at the narrower extremity by two or rarely three branches. 
The branches, which are of little more than half the diameter of the larger segments, 
consist individually, when complete, of about three subcylindrical or oval chambers. 
The principal aperture is at the broader end, and the branched condition of the test can 
only be accounted for on the supposition that the growing chambers have inferior as well 
as superior orifices. In some specimens I have found that this is actually the case, but 
in the complete test the terminal segments of the branches are closed aud rounded. In 
one example the large end chamber has two distinct apertures, as though the test were 
ready to bifurcate at the superior as well as at the inferior end. 
For the figured specimens of Reophax Jindens, I am indebted to my friend Dr. G. M. 
Dawson of Montreal. They are from the original locality, Gaspe Bay, Gulf of St. 
Lawrence, depth 15 to 20 fathoms. Mr. J. D. Siddall has good examples from the 
estuary of the Dee ; but beyond these I know of no other authenticated locality for 
the species. 
Haplophragmium, Reuss. 
Spirolinites, Northampton [1838], Mantell. 
Spirolina, pars, Roemer [1840], Reuss, d’Orbigny, Karrer. 
Orhignyna, Hagenow [1842], 
Placopsilina, Reuss [1854], Parker and Jones, Morris and Quekett. 
Nonionina, pars, Bornemann [1855], Sckultze, Williamson, Parfitt, Terquem. 
. Proteonina, pars, Williamson [1858], Terquem. 
Lituola, pars, Parker and Jones [1860], Carpenter, Brady, M. Sars, Whiteaves, G. M. Dawson. 
Winther, Schulze, Berthelin, Terrigi, Robertson, &c. 
Haplophragmium, Reuss [1860], Stacbe, Sch wager, Giimbel, Hantken, Terquem, Brady, 
Wright, Siddall, &c. 
Flabellina pars, Terquem [1870]. 
Endothyra , pars, Moller [1879]. 
Raphidohelix , Moebius [1880], 
Test free or rarely adherent, convoluted ; consisting of numerous segments arranged 
in a nautiloid, Rotaliform, or trochoid spire, or planospiral at the commencement and 
subsequently combined in a straight or curved linear series. Aperture simple or divided. 
Walls coarsely arenaceous, rough externally; chamber- cavities non-labyrinthic. 
The genus Haplophragmium, as instituted by Reuss, is distinguished from Lituola 
(proper) by its non-labyrinthic chambers. It consists for the most part of sandy 
isomorphs of the CristellaricB and Nonionince, but embraces in addition a number of 
inequilaterally spiral forms, which assume to a greater or less extent the Rotalian plan 
of growth. It has consequently a similar morphological range to Trochammina (proper), 
but the test of Trochammina is smooth and finely-cemented, whilst that of Haplophrag- 
mium is rough and coarsely arenaceous. 
