362 
THE YOYAGE OF H.M.S. CHALLENGER 
As a fossil it has been obtained from the Cretaceous formations of the north of 
Ireland (Wright), the Eocene clays of the London Basin (Jones and Parker, Brady), the 
Miocene deposits of Austria, France, and elsewhere (d’Orbigny, Czjzek, &c.), the later 
Tertiaries of Italy (Defrance, d’Orbigny, Jones and Parker), the Crag of the east of 
England (Jones, Parker, and Brady), and the Post-tertiarv beds of Norway, Scotland, and 
Ireland (Sars, Robertson, Wright). 
Textularia scigittula , var . jistulosci, nov. (PL XLII. figs. 19-22). 
The general characters of this variety are similar to those of the typical form, but the 
lateral edges of the chambers are supplemented by tubulated projections, which are directed 
obliquely towards the primordial end of the test, and which, when perfect, impart an 
irregularly dentate or serrate contour to its margin. These tubular growths are some- 
times given off along the entire length of the shell, sometimes only from the earlier 
chambers ; they are generally arranged in single file, but occasionally in a partially double 
or multiple row. They often open directly into the cavities of the chambers to which 
they are individually appended ; but on the other hand, they frequently appear to form 
distinct supplementary chamberlets, without any orifice in the enclosed portion of the 
primary wall. In the latter condition it is probable that communication originally 
existed, and that it has been gradually closed by the subsequent thickening of the shell. 
The fistulose condition of Textularia sagittula appears to be the result of redundant 
growth ; and it is principally met with in specimens from tropical and sub-tropical 
latitudes. 
Textularia siphonifera, H. B. Brady (PI. XLII. figs. 25-29). 
Textularia sijphonifera, Brady, 1881, Quart. Journ. Micr. Sci., vol. xxi., N. S., p. 53. 
Test free ; elongate, sub cylindrical, nearly round in transverse section, tapering and 
pointed at the primordial end ; each of the two opposing series of segments furnished 
with numerous fistulse (or supplementary chambers ?), most of them with rounded 
external orifices, arranged in from two to four, more or less regular, longitudinal rows. 
Length, T \-th inch (1*5 mm.) or less. 
It is often very difficult to determine the relation of the lateral fistular growths 
of the Textularice to the segments with which they appear to be immediately connected. 
In the present species I have never been able to trace, either by sections or otherwise, 
any well-marked orifice in the included portion of the primary wall, and in the absence 
of such connection the “ fistulse” can only be regarded as supplementary chamberlets. 
The drawing (fig. 29) represents accurately the transverse section of a shell having 
