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this portion may be the wall of the inner chamber partially exposed. 
The size of the smaller specimens to which reference has been made is 
ratber more than 1/200 in. (0 * 127 mm.) in length, that of the larger 
somewhat less than 1/100 in. (0 • 25 mm.), the breadth being about two- 
thirds the length. The largest, and on the whole the best, examples 
hitherto found, were obtained by Mr. Harris from sand dredged in the 
Java Sea, by Captain Seabrook, the master of a merchantman, unfor- 
tunately lost in the Samoa hurricane two years ago. Smaller 
examples occurred in a dredging made off Cebu, Philippine Islands, 
and more recently the same form has been met with in 4 Challenger ’ 
material from Station 33 — off Bermudas, 435 fathoms. As stated at 
the commencement, I am indebted to Mr. W. H. Harris for the speci- 
mens which form the subject of the present Note, and it seemed fitting 
that the organism should bear his name, but he prefers that it should 
be associated with that of Captain Seabrook, and I have acted accord- 
ingly. Further research with a larger supply of material will probably 
add to our knowledge of the type, meanwhile the following provisional 
descriptions will serve for its identification. 
Seabrookia, nov. gen. 
Essential characters : — Test free, hyaline, perforate ; composed of 
a number of chambers, each inclosing, partially or entirely, that pre- 
ceding it ; aperture terminal, alternately at the two ends of the test. 
Seabrookia pellucida, n. sp. 
Test oval, depressed, the two sides unequally convex, sometimes 
almost plano-convex ; aboral end broad and rounded, oral end some- 
what drawn out ; peripheral edge acute or subcarinate, in large speci- 
mens serrate. Composed of a number of segments, the later chambers 
of the adult shell each inclosing, partially or entirely, those preceding 
it, a portion of the penultimate segment visible externally on the 
gibbous face of the test. Walls thin and transparent, smooth, or 
nearly so, externally, minutely perforated. Aperture simple, terminal, 
taking the form of a linear or elongate-oval slit with thickened lip. 
Length 1/100 in. (O’ 25 mm.) or less. 
The facts which have been brought forward are sufficient to show 
that we have in Seabrookia a tolerably close isomorph of Biloculina, 
the one belonging to the vitreous series of Foraminifera, the other to 
the porcellanous. Further, that amongst already known types its 
nearest ally is Chilostomella, and that its natural position is in the 
Chilostomellidw, probably between Chilostomella and Ellipsoidina. 
