REPORT ON THE FORAMINIFERA. 
183 
on the outer face of the final segment ; it is a simple rounded orifice, with or without a 
Milioline tongue. 
The genus Articulina makes its appearance with the beginning of the Tertiary epoch, 
and is found sparingly in shallow-water deposits of middle and later Tertiary age. 
Articulina sulcata, Reuss (PL XII. figs. 12, 13). 
Articulina sulcata, Reuss, 1849, Denkschr. d. k. Akad. Wiss. Wien, vol. i. p. 383, pi. xlix. 
figs. 13-17. 
Prof. Reuss ( loc . cit.) figures under the name Articulina sulcata a small striate 
Foraminifer with the general contour of Miliolina, that is to say, without any 
supplementary linear segments. In the absence of dimorphous structure, the oval 
aperture, the bordered septal ends of the segments and their shape are held to be 
sufficiently characteristic to justify the position assigned to it. The question, however, 
is not so much wdiether the figured shells belong to the genus Articulina as whether 
they are fully grown, or only one of the previously known species in its primary 
stage. 
Recent specimens, similar in all important points to the little fossils referred to, 
have been obtained from some of the Challenger dredgings, and, so far as they go, they 
tend to confirm the view that the adult condition is reached without any change in the 
mode of growth. They are often of larger dimensions than the Milioline portion of 
Articulina conico-articulata, and the distribution differs considerably from that o 
Articulina sagra. In the absence of any direct evidence that they represent the young 
or arrested condition of either of these species, I have, with some hesitation, adopted 
Reuss’s name for them. 
Articulina sulcata is found at four Challenger Stations : — off the Bermudas, 435 
fathoms ; off Culebra Island, 390 fathoms ; on the Honolulu coral-reefs, 40 fathoms ; and 
off Raine Island, 155 fathoms. The somewhat similar shell with Spiroloculine contour 
(PL IX. fig. 1) was dredged off Kandavu, 255 fathoms. 
The localities given by Reuss for the fossil examples are the Tertiary clays of 
Felso-Lapugy in Transylvania, and of Wieliczka in Galicia. 
Articulina lineata, n. sp. (Pl. XII. figs. 19-21). 
Test elongate, compressed, broadly spathulate ; consisting of a flat Milioline shell, 
surmounted by one or two rectilinear chambers. Margin thin, sharp, or slightly rounded, 
without any material constriction at the sutures. Surface ornamented with delicate 
parallel longitudinal striae. Aperture oval, situated in the middle of the bordered slit- 
like depression which forms the end of the latest segment. Length, ^th inch (0'6 mm.). 
