REPORT ON THE EORAMINIEERA. 
309 
margin of the final chamber. Shell-wall finely arenaceous, nearly smooth externally, and 
of clear yellow-brown colour. Diameter, ^th inch (0'8 mm.) or less. 
Haplophragmium scitulum has a symmetrical and neatly finished test, slightly 
evolute, that is to say, the successive convolutions not entirely concealing those previously 
formed, compressed, and somewhat sunken near the centre on either side. The spire is 
relatively longer than in the other nautiloid forms of the same genus, and the number 
of segments in each convolution is larger. Its nearest ally is Haplophragmium 
laticlor scitum, and the marked difference in structure presented by the shells of the two 
species is strikingly shown in the drawings of their respective horizontal sections 
(PL XXXIV. fig. 10, and fig. 13). 
Out of a list of eleven localities at which Haplophragmium scitulum has been noticed, 
eight are in the North Atlantic, the area embraced extending from the Faroe Channel to 
the Cape de Verde Islands and the West Indies, and the range of depth from 530 to 
1445 fathoms ; the remainder are, — one in the South Atlantic, east of Buenos Ayres, 1900 
fathoms ; one in the South Pacific, west coast of Patagonia, 400 fathoms ; and one in the 
deep region of the North Pacific, 2900 fathoms. 
Haplophragmium glomeratum, H. B. Brady (PI. XXXIV. figs. 15-18). 
Lituola glomerata , Brady, 1878, Ann. and Mag. Nat. Hist., ser. 5, vol. i. p. 433, pi. xx. 
fig. 1 , a.b.c. 
Haplophragmium glomeratum , Id., 1881, Denkscfir. d. k. Akad. Wiss. Wien, vol. xliii. p. 100, 
No. 21. 
Test free, spiral, subglobular or ovate, elongated in the direction of the axis, some- 
what sunken at the umbilici ; composed of about two slightly unsymmetrical convolutions. 
Segments few, three or four in the outer whorl ; short and broad in the direction of 
growth, inflated. Walls thin, coarsely arenaceous, rough externally. Aperture near the 
middle of the inner margin of the terminal segment ; often indistinct. Diameter seldom 
more than y^-th inch (0'25 mm.). 
This, which is one of the most minute of the spiral Lituolince, is also one of the most 
obscure in point of structure, owing to the fact that the septation is often imperfect and 
the sutures scarcely visible externally. Its structural features may be best understood by 
imagining one of the nautiloid species, such as Haplophragmium latidorsatum, drawn 
out at the umbilici so as to form a test bearing some resemblance to the oval Alveolince. 
It is, however, seldom quite symmetrical, one end being generally broader than the other, 
and the umbilici are often a good deal excavated. These terms apply to well-grown 
adult specimens ; the young and minute tests are too indifferently characterised for 
zoological description. 
Haplophragmium glomeratum is common in the Arctic seas. It has been found at 
(ZOOL. CHALL. EXP.— PART XXII. 1883.) Y 40 
