456 
The characteristics have already been given in the generic de- 
scriptions and the presence of the contact furrow in the neanic 
stage noticed. It only remains to call attention to the fact that 
this and the dorsal lobes of the sutures are generated together as the 
whorls come in contact. 
PYCNOCERAS CALCIFERIFORME, DN. S. 
Loc., Port au Choix and Schooner Island, Newfoundland and 
Phillipsburg, Canada. , 
This species is sufficiently abundant at Port au Choix, and seems 
at first identical with calciferus of Port au Choix, but the latter 
is probably a species of Tarphyceras, having the small siphuncle of 
that group. 
The shell reaches a considerable size, 128 mm. in the entire 
diameter, This specimen has a living chamber somewhat over one- 
‘half of a volution in length, and a similar living chamber occurs in 
a younger specimen longer than in Eurystomites. 
The whorl in section is an oval with evenly rounded sides, no 
umbilical shoulders, and the abdomen broader than the dorsum, but 
in the neanic stage, and perhaps in the early part of the ephebic 
stage, the sides are evenly rounded and very gibbous, and the venter 
may be narrower than the dorsum, measuring through the thickest 
inner part of the whorl ventrad of the impressed zone. 
The siphuncle is very large, measuring just before entering the 
living chamber about 7 mm., and is propioventran in position, but 
less than its own diameter distant from the venter. It has a sub- 
ventran position in the ananeanic substage, the earliest age observed. 
Billings described the siphuncle in Zurphyceras calciferus as small 
at the diameter tor the whole shell of three inches, and the septa as 
numbering about twelve to the inch along the venter at the diame- 
ter of three inches. At this diameter in calciferiforme the septa 
are six or eight to the inch, and the siphuncle is about 5 mm. in 
diameter. 
The contact furrow is very slight at all stages. The septa are 
deeply concave, approximating to those of Lurystomites gibbosus, 
but owing to the slight amount of involution the dorsai lobes are shal- 
low ; thus showing the dependence of this character upon the amount 
of involution, as well as the concavity of the septa. There are 
broad ventral saddles with almost straight suture or slight lobes, 
broad lateral lobes trending forwards to narrow saddles at the lines 
of involution. 
