594 DR. J.C. COX ON NEW AUSTRALIAN LAND SHELLS. [Noy. 22, 
The neural arch is of the same form as those of the other cervical 
vertebra, but much smaller, and not so high; it is separate from the 
large conical mass which they constitute, forming a pointed, rather 
projecting arch at the hinder side of the mass. The upper lateral 
process is similar in form to the upper lateral processes of the two or 
three cervical vertebre that precede it; but it is much larger than 
these, and bent forwards at the end to unite with the ends of them. 
The lower lateral process is very thick and large, forming a large 
short tuberosity on the lower part of the mass, but quite separate 
from it. The articulating surface of this vertebra is oblong, erect, 
rather higher than wide, with a deep suture from the centre to the 
middle of the upper margin. 
The front of the canal of the spinal marrow is triangular, with 
the angle rounded, the upper side being transverse and the lower 
ones converging, and about as high as wide. The hinder part of the 
canal, on the contrary, is trigonal, with the upper sides converging 
—the lower side being rather wider than the height of the canal, 
and about two-fifths of the width of the body of the seventh cervical 
vertebra. 
In the British Museum there is the mass of the cervical vertebree 
of a young Hyperodon butzhopf. It is, unfortunately, not in a good 
condition, the edge being worn, and the upper lateral processes of 
the hinder cervical vertebree being broken off. It agrees in general 
shape with the cervical vertebrze of Lagenocetus above described ; 
but the upper cone formed by the united neural arches is not so 
high, nor keeled in front. The greatest difference is in the seventh 
cervical vertebra, its lateral processes and neural arch being as com- 
pletely united to the other vertebree as any of the rest, the whole 
seven forming a single bony mass. 
The canal of the spinal marrow is very large, but otherwise like 
that of Lagenocetus ; but the hinder part of the canal is higher, being 
as high as wide above, and its width rather greater than half the 
width of the body of the seventh cervical vertebra. 
2. DescripTions oF Four New Species or AUSTRALIAN LAND 
Suetis. By James C. Cox, M.D., F.R.C.S. Epins. 
a =) 
1. HELIX MARIZ. = €#ec cr eteeceed rel 
H. testa subample et profunde umbilicata, lenticulari, depressa, 
crassiuscula, pellucida, parum nitente, obsolete radiato-striata, 
sub lente utrinque minute granulata, colore variante inter sor- 
dide luteum et pallide castaneum, fascia spirali rufescente aut 
eastanea supra carinam, alteraque secus suturam, annuloque lato 
castaneo circa umbilicum, intus pallidum ; spira convexiuscula ; 
anfractibus quinque planulatis, ultimo obtuse carinato ; aper- 
tura subquadrato-ovata; peristomate expanso, reflexo, albo; 
margine externo recto, columellari leviter bisinuato, bast expan- 
siusculo. 
