GIRTY, ^'EW CARBONIFEROUS FOSSILS 191 



marked lunarium. They are separated by one or two rows of mesopores and 

 stand at one half or one diameter apart, coming about 5 or more in 2 mm. In 

 longitudinal section, the mesopores are seen to occur in one or more tiers, and 

 the zocecia develop few or no diaphragms. 



This form is more closely related to the variety harrisonensis than to 

 typical excellens, but it has smaller zooeeia which are rather more dis- 

 tantly arranged (since none are in contact), and fewer diaphragms. 



Batostomella anomala sp. nov. 



Zoarium consisting of slender cylindrical branches about 2 mm. in diameter. 

 Cortical zone shai-ply defined but very narrow, about .2.5 mm. wide. Zocecial 

 tubes very long and slightly oblique in the median portion of the stem, near 

 the outer end abruptly bent outwai'd to a direction perpendicular to the sur- 

 face. Where the direction is longitudinal, the zocecial walls are thin ; where 

 radial, strongly and abruptly thickened. The thickening sometimes has the 

 appearance of two partly fused beads : more often it has only an oval shape 

 without trace of moniliform structure. Occasional slight swellings occur at 

 other points in the wall. Apertures rounded, usually elongated, separated by 

 walls equal to or greater than their own diameter, the longitudinal distance 

 being often a little greater than the lateral. Owing to the thickness of the 

 wall, the diameter of the apertures is unusually small : about 5 cells occur in 

 2 mm. when they are end to end. and about 7 when they are side by side. 

 Large acanthopores occur at the corners of the cells, but, owing to the thick- 

 ness of the walls, they do not encroach upon them. There is also developed 

 near the surface a row of small granules thi'ough the middle of most of the 

 walls, possibly through all. Mesopores are rare, possibly absent altogether. 

 Diaphragms are also rare. 1 or 2 near the aperture in many of the zocecia. 

 .some of them distinctly perforated. 



Batostomella parvula sp. nov. 



Zoarium in the form of slender, solid Itranches having a diameter of 2 mm., 

 more or less. Branching irregular, three or four branches being occasionally 

 given off at a time, in which case the stem is very much enlarged, often 

 broadened and relatively compressed. Zocecia thin-walled and longitudinal in 

 the middle of the stem, thick-walled in the mature zone, which is very nar- 

 row. They meet the surface obliquely, or with a very short horizontal por- 

 tion. The apertures are more or less elliptical to subpolygonal. elongated in 

 the longitudinal direction of the branch, separated by intervals of about one 

 half their own width, but showing extreme variation. Six or 7 occur in 

 2 mm. longitudinally, more transversely, although as the average branch has 

 a diameter of about 2 mm., the number is not readily a.scertained in those 

 terms. 



Mesopores rather rare, irregularly distributed, in some places apparently 

 absent, in others occurring in groups of two or three. Acanthopores numer- 

 ous and large, occurring in the angles of the cells, most of the angles being 

 furnished with them. Owing to the thickened walls, the zocecia have a 

 rounded shape, and the acanthopores imbedded in the walls do not indent 



