478 
THE YOYAGE OF H.M.S. CHALLENGER. 
Lagena siliqua, Rymer Jones (PI. LIX. fig. 27). 
Lagena vulgaris , var. siliqua, Ry. Jones, 1872, Trans. Linn. Soc. Lond., yol. xxx. p. 61, pL xix. 
fig. 49. 
„ samara, Brady, 1881, Quart. Journ. Micr. Sci., yol. xxi., N. S., p. 61. 
The test of Lagena siliqua is elongate and compressed, broadest near the middle and 
tapering towards the ends, both of which are pointed. It consists of a central, circular, 
biconvex chamber, with a large peripheral wing, which is narrow at the sides but much 
developed at base and apex. Length, nearly ^th inch (1 - 26 mm.). 
This is a rare variety. The single Challenger specimen was found in company with 
Lagena seminiformis in mid- Atlantic, a little south of the equator, depth 2350 fathoms; 
that figured by Rymer Jones was from near the coast of Java, 1080 fathoms. 
Lagena seminiformis, Schwager (PI. LIX. figs. 28-30). 
Miliola stiligera (V), Ehrenberg, 1854, Mikrogeologie, pi. xxxi. fig. 6. 
Lagena seminiformis, Schwager, 1866, Novara-Exped., geol. Theil, vol. ii. p. 208, pL v. 
fig. 21. 
Of this singular and beautiful species Dr. Schwager has only figured one, and that, 
judging from the deep-sea specimens, scarcely a typical example. 
The body of the shell is circular and biconvex, surmounted by a long tubular neck ; 
and the whole is surrounded by a broad laminar wing reaching to the oral end of the 
neck and extended at the base so as to form two points which are separated by 
a wide central depression. Specimens sometimes attain a length of nearly ^jth inch 
(l - 26 mm.). 
Under the name Miliola stiligera, Ehrenberg has introduced a fossil Lagena differing 
but little in general contour from some of the more elongate specimens of the present 
species ; but the drawing is taken from an imperfect shell, and, owing to the method of 
observation pursued by the author, the characters are left somewhat obscure. 
In the living state Lagena seminiformis is essentially a deep-water organism. Its 
distribution-list includes two Stations in the North Atlantic, 1000 fathoms and 1750 
fathoms respectively; three in the South Atlantic, 1425 to 2350 fathoms; four 
in the South Pacific, 1375 to 2075 fathoms; and one in the North Pacific, 1850 
fathoms. 
The specimens described by Schwager were Upper Pliocene fossils from Kar Nicobar ; 
that figured in the “ Mikrogeologie ” was from the Chalk of Volsk in Russia. 
