EEPOET ON THE FOEAMINIFEEA. 
307 
Haploph ragmium latidorsatum, Bornemann, sp. (Pl. XXXIY. figs. 7-10, 14). 
Nonionina latidorsata , Bornemann, 1855, Zeitsclir. d. deutscli. geol. Gesell., vol. vii. p. 339, 
pl. xvi. fig. 4, a.b. ► , 
Haplophragmium crassnm, Beuss, 1867, Sitzungsb. d. k. Ak. Wiss. Wien, vol. lv. p. 46, pl. i. 
figs. 1, 2. 
Lituola subglobosa, M. Sars, 1868, Yidensk.-Selsk. Forkandlinger for 1868, p. 250. 
„ „ G. 0. Sars, 1871, Ibid. for 1871, p. 253. 
Haplophrag rn ium rotundidorsatum, Hantken, 1875, MittbeiL Jabrb. d. k. ung. geol. Anstalt., 
vol. iv. p. 12, pL i. fig. 2. 
„ subglobusum, Brady, 1881, Denkscbr. ck k. Akad. Wiss. Wien, vol. xliii. p. 100, 
No. 22. 
Test free, nautiloid ; subglobular or compressed ; consisting of about two convolutions, 
the later of which completely encloses the earlier. Segments numerous, about six in -the 
outer whorl, often somewhat inflated ; septal lines distihct, sometimes sunken or excavated. 
Aperture a curved slit along the base of the outer face of the final segment ; either 
simple or subdivided into a line of rounded pores. Walls thick, arenaceous ; 
firmly cemented and well-finished; colour light-brown. Diameter, T ^th inch (2‘3 mm.) 
or less. 
The study of an abundant supply of specimens in the recent condition has convinced 
me that the Nonionina latidorsata of Bornemann, the Haplophragmium crassum of 
Reuss, and the Lituola subglobosa of M. Sars, represent only individual modifications of 
the same specific form, with no claim to be regarded as even varietally distinct from each 
other ; and under these circumstances precedence has been given to the earliest specific 
name. 1 With regard to the last of these, it may be stated, that although neither descrip- 
tion nor figure is furnished by the author, the characters of the Norwegian specimens 
for which the name was intended are well known. 2 The two forms quoted from 
Bornemann and Reuss are neither of them quite typical; both are a good deal compressed, 
one is represented with flush sutures, the other with somewhat inflated chambers and 
excavated sutures. Similar conditions, exaggerated in degree, are exemplified in 
Pl. XXXIY. figs. 7 and 8, and it is easily shown that not only these, but specimens to 
all appearance further apart, represent mere individual modifications of the same typical 
form. The comparative sphericity or lateral compression of the test, and the degree of 
inflation of the segments are constantly varying features. In the northern cold deep- 
sea area explored by Prof. G. O. Sars, Haplophragmium latidorsatum exists in enormous 
numbers, sometimes to the extent of 20 per cent, of the entire weight of the washed and 
1 It is not improbable that the specimen figured by Soldani ( Testaceographici , vol. ii., pl. xxvi. fig. N.) and subsequently 
named by d’Orbigny Robidina rugosa (Ann. Sci. Nat., 1826, vol. vii. p. 290, No. 21) may also belong to this species, but 
the drawing is too obscure to be identified with any certainty, and it may only represent a fossil Cristellarian. 
2 I am indebted to Prof. G. O. Sars of Christiania for type specimens of this form. It has not been without 
reluctance that the name employed in the late Prof. M. Sars’s list of Norwegian Foraminifera has been abandoned. 
