REPORT OIST THE FORAMINIFERA. 
257 
which is broad and open. Texture coarsely arenaceous, hard and firmly cemented ; 
exterior rough. Length, -|-rd inch (8 mm.). 
It is possible that this may be only a local variety of Jaculella acuta, from which 
species it differs chiefly in having a small inflated primordial chamber, instead of terminat- 
ing in a point. The test is comparatively slender, and not so regularly tapering ; indeed 
it sometimes contracts a little near the oral end, leaving nevertheless a broad open aper- 
ture, as shown in fig. 20. The bulbous extremity is often armed with a number of 
long projecting sponge-spicules. The texture of the test is usually less rough and hard 
than that of Jaculella acuta. 
Jaculella obtusa occurs in dredged sands obtained both on the “ Porcupine ” and the 
“Knight Errant” Expeditions, from the warm area of the Faroe Channel, at depths of 
350 fathoms and 542 fathoms. 
Hyperammina, H. B. Brady. 
Hyperammina, Brady [1878], Norman, Balkwill and Wright, Haeusler. 
Girvanella (?), Nicholson and Etheridge [1878]. 
Psammatodendron (Norman, MS.) Brady [1881], 
Test free or adherent ; consisting of a long, simple or branching arenaceous tube, the 
primordial end of which is closed and rounded ; the opposite extremity, which is open and 
but little if at all constricted, forming the general aperture ; interior smooth. 
The genus Hyperammina is of very general distribution, and in one form or other is 
found at the sea-bottom over large areas of both northern and southern hemispheres, most 
of the species preferring deep water. It is more than probable that the Silurian organism 
to which the provisional name Girvanella has been given by Nicholson and Etheridge 
may be a somewhat minute variety of the type, closely allied to Hyperammina vagans ; 
and similar forms more distinctly characterised have been found by Dr. Haeusler in the 
Jurassic rocks of Switzerland. 
Hyperammina elongata, H. B. Brady (PI. XXIII. figs. 4, 7-10). 
Hyperammina elongata (pars) Brady, 1878, Ann. and Mag. Nat. Hist., ser. 5, vol. i. p. 433, 
pi. xx. fig. 2, a. b. 
„ „ Id. 1879, Quart. Journ. Micr. Sci., vol. xix. N. S., p. 32. 
„ „ Balkwill and Wright, 1882, Proc. R. Irish Acad., 2 ser. (Science), 
vol. iii. p. 546. 
Test free ; in the form of a straight or nearly s traight, unbranched, subcylindrical tube ; 
primordial end slightly inflated, closed, and rounded ; the opposite extremity but little 
