96 
BULLETIN OF THE LABORATORIES 
Other species associated in this horizon await a better opportunity. 
We reproduce part of Prof. Hall’s description. Zoarium consisting 
of a flattened, dichotomously branching frond arising from a spread- 
ing base. Branches 3-4 mm ; margins sometimes parallel, at others 
slightly diverging, the greatest increase in width in a length of 15 
mm. being i mm; non-celluliferous marginal space narrow, width .15 
mm, not flat ; transverse section regularly convex on the two sides, 
greatest thickness .50 mm; bifurcations comparatively distant, 
branches diverging at an angle of 60° or more. Cells tubular, for the 
greater portion of length very oblique, often nearly parallel to the 
mesotheca, then turning and opening obliquely to the surface, on the 
narrower portion of the branches often recumbent for nearly the en- 
tire length. ^ ^ (yell apertures very broadly oval, 
often circular, sometimes pustuliform, disposed in somewhat irregular 
longitudinal rows, but the rows being very close together and the ap- 
ertures being separated by more than twice their diameter, the ar- 
rangement is indistinct; they sometimes alternate and form oblique 
transverse rows and often irregular, direct transverse rows. Marginal 
apertures very little if at all larger than the others. Peristomes mod- 
erately thick, strongly elevated, smooth; interapertural and marginal 
space striated, striae short, tortuous, interrupted.” 
While some doubt may still exist as to the identity of our species 
with the above, its Devonian affinity is obvious. 
Addenda. 
[To Page 65.] 
Schizodus IProtoschizodusA palaeoneiliforinis, sp. n. 
(Plate XII, Fig. 44.) 
Six specimens found since the above was printed present concord- 
ant characters. 
Of small size, sub-nuculiform, produced behind, equivalve, 
length to height as 23 to 15. Beaks less than one-third the length from 
the anterior; hinge somewhat over half to nearly two-thirds the total 
length ; anterior margin short, broadly rounded, passing gently into the 
very slightly and uniformly curving lower margin, which meets the 
