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THE VOYAGE OF H.M.S. CHALLENGER. 
laid down by him for the genus, because no figures are given which throw any light 
upon their internal structure, but many of them closely resemble recent non-labyrinthic 
forms. Be that as it may, the generic term Haplostiche serves a useful purpose, and has 
been retained under its original limitations for the straight or curved linear species with 
labyrinthic chambers ; whilst Montfort’s name Reophax, which was treated by Reuss as 
a synonym only, has been rehabilitated for the more numerous series in wdiich the cavities 
are undivided. 
Haplostiche soldanii, Jones and Parker, sp. (PL XXXII. figs. 12-18). 
“ Ortboceratia Zoophytica minuscula,” Soldani, 1791, Testaeeographia, vol. i. pfc. 2, p. 93, pi. 
xcviii. fig. A. 
Orthoceras Trochus,” Id. 1798, Ibid., vol. ii. p. 16, pL iii. fig. c.c. — Saggio Orittog., p. 135, pL 
xix. fig. 92, Z. 
Nodosaria dubia, d’Orbigny, 1826, Ann. Sci. Nat., vol vii. p. 252, No. 10. 
Lituola soldanii, Jones and Parker, 1860, Quart. Journ. Geol. Soc., vol. xvi. p. 307, No. 181. 
„ dubia, Parker, Jones, and Erady, 1871, Ann. and Mag. Nat. Hist., ser. 4, voL viii. p. 263, 
.pi. ix. fig. 30. 
„ soldanii, var. intermedia, Vanden Broeck, 1876, Ann. Soc. Belg. Micr., vol. ii. p. 74, 
pi. ii. figs. 1, 3, 4, 6. 
Test elongate, subcylindrical or ovate, inferior end round or tapering to a blunt 
point, superior end broad and rounded ; consisting of numerous, convex, slightly 
embracing chambers, superimposed in a straight or somewhat curved line. Exterior 
rough, but little constricted at the sutures ; interior of the chambers subdivided by 
irregular secondary septa. Aperture terminal ; porous or dendritic. Length of large 
specimens, x 3 oth inch (7'5 mm.). 
The recent specimens of the genus Haplostiche may all be assigned to a single 
species. They present, nevertheless, a great variety of contour, ranging from such forms 
as the Nodosaria dubia of d’Orbigny, of which the short, broad shell portrayed in 
fig. 14 is an instance, to the long and narrow Lituola soldanii, var. intermedia of 
Yanden Broeck, which closely resembles figs. 12 and 13. In the absence of any described 
species to which the bulk of their specimens could be properly referred, Messrs Jones and 
Parker, many years ago, selected two of Soldani’s figures, which appeared to exemplify 
average characters, as representatives of the type, and named them after their discoverer 
Lituola soldanii. With these as central forms, the recent examples constitute a single very 
natural specific group. When a number of specimens are examined together, it becomes 
evident at once that there is no basis for subdivision into varieties ; for whilst the extreme 
modifications are widely different in external characters, no two specimens are alike, 
and every link in the intermediate series is easily found. 
Haplostiche soldanii is not likely to be confounded with any other of the Lituolidce, 
