54 HENRY B. BRADY. 
larly distributed in the central part of the exposed face 
of the terminal chamber. Interior non-labyrinthic. 
Length, about + inch (4:8 mm.). 
This species is of much interest in its bearing upon a 
group of Carboniferous Foraminifera which have been a source 
of difficulty to paleontologists. The fossils alluded to were 
described by myself some years ago under the provisional 
generic name Climacammina,' and since that time similar 
specimens from the Russian Carboniferous beds have been 
figured by Prof. von Moller with the fresh generic term Crv- 
brostomum.? The characters of most, if not of all the fossil 
specimens, have been a good deal obscured by external 
agencies, such as pressure and the process of mineralisation, 
but they are easily recognised in the presence of the recent 
examples which we now have for comparison ; indeed, it is 
not altogether easy to find positive features whereby to 
distinguish the palzeozoic from the living species. Through- 
out the whole genus Teztularia the aperture is one of the 
most variable features, and as the only conspicuous point in 
which the dimorphous forms under consideration differ from 
the typical Bigenerina is in the fact that their later segments 
have a porous instead of the usual simple aperture, I can 
see nothing to be gained by employing a distinctive generic 
or subgeneric name for them. 
CurysaLipina, d’Orbigny. 
Chrysalidina dimorpha, nov.—Test elongate, triangular, 
tapering; the three sides nearly equal, the angles sub- 
carinate ; inferior extremity pointed, superior broad and 
convex. ‘Test composed of many segments, the earlier 
ones triserial, the later uniserial. Aperture consisting 
of numerous minute perforations on the superior face 
of the terminal segment. Texture hyaline. Length, 
+5 inch (0°5 mm.). 
CLavuLina, d’Orbigny. 
Clavulina caperata, nov.—Test elongate, subcylindrical or 
fusiform, broadest below the middle; trarsverse section 
nearly circular throughout; triserial portion relatively 
very large. Inferior extremity tapering to a point, 
superior narrow, rounded, or truncate. Segments very 
numerous, irregular in form and arrangement, the 
1 Monograph of Carboniferous and Permian Foraminifera ’ (1876), 
oi. 
Ps ‘Mém. Acad. Sci., St. Petersburg,’ ser. 7, vol. xxvii (1879), p. 39. 
