REPORT ON THE FORAMINIFERA. 
475 
Lagena quadrata, Williamson, sp. (PL LIX. figs. 3, 16 ; PL LX. fig. 5). 
Fntosolenia marginatci , var. quadrata, Williamson, 1858, Rec. For. Gt. Br., p. 11, pi. i. figs. 
27, 28. 
Fissurina pecchiolii, Seguenza, 1862, Foram. Monotal. Mess., p. 58, pi. i. fig. 52. 
„ reda, Id. Ibid. p. 58, pi. i. fig. 53. 
„ oblonga, Id. Ibid. p. 68, pi. ii. fig. 35. 
Williamson describes this variety as “ an obvious modification of Fntosolenia 
marginatci, var. lucida, distinguished by its tendency to assume the form of a par- 
allelogram, with somew r hat rounded extremities.” 
Considerable latitude, however, must be allowed with respect to minor characters. For 
example, the specimen represented by PL LIX. fig. 3, has a wide orifice with sessile lip, 
iindfig. 16 is in all respects similar, except that the margin at the inferior end is carinate ; 
w hil st in the shell of which PL LX. fig. 5 is a drawing, the entire periphery is carinate. 
Seguenza has a closely allied carinate variety, under the name Fissurina rizzce, (op. cit., 
pL ii. fig. 50), distinguished from the last by its more or less produced phialine neck and 
rounded orifice. 
The distribution of Lagena quadrata appears to be influenced by depth of water 
more than by latitude. It is found, both in the northern and southern hemispheres, 
at depths of less than 150 fathoms, but the specimens are never very numerous. 
As a fossil it occurs in the Miocene and Pliocene deposits of Southern Italy (Seguenza), 
and in the Post-tertiary beds of the north-east of Ireland (Wright), but has not been 
observed elsewhere. 
Lagena trig ono -oblong a, Seguenza and Siddall (PL. LXI. fig. 11 , a.b.). 
Trigonulina oblonga , Seguenza, 1862, Foram. Monotal. Mess., p. 74, pi. ii. figs. 56, 58. 
„ biangulata, Id. Ibid. p. 74, pi. ii. figs. 57, 59. 
„ regolaris, Id. Ibid. p. 75, pi. ii. figs. 63, 64. 
Lagena oblonga, Wright, 1877, Proc. Belfast Nat. Field Club, 1876-7, App. p. 104, pi. iv. 
fig. 9, a.b. 
„ (trigono-) oblonga, Siddall, 1879, Catal. Rec. For. Gt. Br., p. 5. 
The shell of this species resembles that of a pyriform specimen of Lagena globosa, more or 
less compressed on three sides ; the marginal edges are either angular or slightly rounded, and 
the aperture is entosolenian. The trifacial compression of the test was treated by Seguenza 
as a generic character and the specific term “ oblonga,” which takes precedence for the 
present form, does not happen to be very appropriate in its altered connection. The 
prefix suggested by Mr. Siddall may be adopted with advantage, and will probably obviate 
confusion. 
Lagena trigono-oblonga has only been noticed at one Challenger Station, — oft 
Tahiti, 620 fathoms. It has been collected by Siddall in the estuary of the Dee, and 
by Balkwill and Wright in Dublin Bay. 
