* KEPORT ON THE EORAMENTFERA. 
363 
three rows of outgrowths on each side. As already stated with reference to the 
redundant variety of Textularia sagittula, it appears probable that there is originally, 
in every case, a communication between the chamberlet and the adjacent chamber by 
means of a stoloniferous pore, but that this is subsequently filled up as the walls become 
thickened by the deposit of shell-substance. The fistulse for the most part have large, 
rounded, external apertures, but in some of them the visible orifice is only a minute per- 
foration, and in specimens from certain localities they are frequently entirely closed in. 
Textularia siphonifera has been observed in sands from the coral-reefs of Honolulu, 
Sandwich Islands, 40 fathoms; from two points off the Admiralty Islands, 15 to 25 
fathoms ; from off Tongatabu, Friendly Islands, 18 fathoms ; and in material dredged by 
the late Mr. M‘ Andrew in the Gulf of Suez, 30 fathoms. 
Textularia rugosa, Eeuss, sp. (PI. XL1I. figs. 23, 24). 
Plecanium rugosum, Eeuss, 1869, Sitzungsb. d. k. Ak. Wiss. Wien, vol. lix. p. 453, pi. i. 
fig. 3, a.b. 
Eeuss’s figure of Plecanium rugosum appears to have been drawn from a comparatively 
poor fossil specimen of the species, represented in its recent condition in figs. 23 and 24. 
The salient character of the test is a certain imbricated or plicate appearance, due to 
the peculiar curvature of the segments, and to a series of transverse arched depressions 
immediately above the sutural lines, near the peripheral margin, on each side. Living 
specimens sometimes attain a length of p^th inch (2 mm.) or more. 
Textularia rugosa is a coral-reef species. It occurs off the Admiralty Islands, 10 to 
25 fathoms; off Booby Island, 7 fathoms ; off Tongatabu, Friendly Islands, 18 fathoms ; 
off Ascension Island, 7 fathoms ; and in the Gulf of Suez, 30 fathoms ; as well as in deep 
water off Amboyna. 
The specimens described by Eeuss w T ere from the Oligocene formation of Gaas, near 
Bax, in the south of France. 
Textularia agglutinans, cl’Orbigny (PI. XLII1. figs. 1-3; vars. figs. 4, 12). 
Textularia agglutinans, d’Orbigny, 1839, Foram. Cuba, p. 136, pi. i. figs. 17, 18, 32-34. 
Textilaria agglutinans, Seguenza, 1862, Atti dell’ Accad. Gioenia, vol. xviii. (ser. 2) p. 112, 
pi. ii. fig. 4. 
Plecanium i sturi, Karrer, 1864, Sitzungsb. d. k. Ak. Wiss. Wien, vol. 1. p. 704, pi. i. fig. 1. 
Textularia agglutinans, Parker and Jones, 1865, Phil. Trans., vol. civ. p. 369, pi. xv. fig. 21. 
Plecanium agglutinans, Eeuss, 1869, Sitzungsb. d. k. Ak. Wiss. Wien, vol. lix. p. 452, pi. i. 
figs. 1, 2. 
Textilaria agglutinans, Mcebius, 1880, Foram. von Mauritius, p. 93, pi. ix. figs. 1-8. 
This species may be taken as the type of the arenaceous varieties of Textularia, 
which collectively form the genus Plecanium of Eeuss and others. D’Orbigny ’s figures 
