92 TRANSACTIONS OF THE ROYAL CANADIAN INSTITUTE.  [VOL. XI 
EXPLANATION OF PLATES. 
Unless otherwise stated, figures are of natural size. 
PLATE (11, 
Fig, 1—Discoceras (?) shamatiqwense, Sf. 200. ...0..6)s.cicclssts's dss essere els eacuee 
The mould of the only specimen. 
Big 2——PVGROStglus MAXIMUS, (SPB. sb S02 6 ss 04's one Oka oles alta eke Rete 
Portion of epitheca, X 2. 
Fig. 3——Pycnosiylus elegans, Whiteners. .../. 6s. ssa'so aq taidiew cules ose ee eee 
Portion of epitheca, 5. 
Hig AP NGPOSEYIUS (0) \ SI FEE AN ee ic Scie) s lid wus yeni ert dare ee vee aie 
Portion of a decorticated epitheca, X 5. 
Big. 5—Hotamaria ho peinst. SPU Pide ce. 0. '.6 tis ijeles sacha a wis amide eae a 
Cast of the type specimen. 
PAG 1G (COCA tig Sp AHO tha wie Yetahnlsly 0) Soe Oe Ae Ghai d Sie Soh oles ee ee 
Cast of three whorls. The dotted apex is restored. 
Big. 7—-Phragmoceras'nelsonense, SP. NOW... os 0 a's iis eed aiole's ieee eee op ERE 
Cast of the best preserved specimen showing the sharp angulation at 
the base of the living chamber. 
Fig, 8—-Hormoloma PaweciGensts, SP. MOV... oo. cece ccyue ne wd danse s cata deeaee 
Four whorls of the most perfect cast. 
Figs. 9 and 10—Pycnomphalus colemani, Sp. NOV... ccc ec ce cee cee ences 
° Fig. 9, Apical view of cast. The inner whorls have been much 
restored. 
Fig. 10, Basal view of cast. The inner ring represents the matrix 
lying above the umbilical callosity. 
PLATE II. 
Fig. 1—Actinoceras richardsoni Magnum, Var NOV... 2... cece cece eee eee 
Vertical section showing the tapering endosiphuncle, the calcareous 
lamellar filling of the siphuncle, the tubuli, and the septa. 
Pigii2—Poerertoceras: byrreila, SP Wow i sia\scio scsiet Loava)e inet haan che a teva he are ee are 
Lateral view of cast. The beaded ornamentation at the rear of the 
body chamber is restored from other specimens. 
Big eA GianoGer as) SP aby 1 Ne i AE lat ak La et ole ey Ae 
Two segments of the siphuncle. The only specimen. Figure is 
inverted. 
Fig. 4—Orthoceras (Thoracoceras) lepidodendroides, Sp. NOV... 1... eee ce eee eee 
View of the type. Ornamentation restored but not emphasized. 
There is possibly a little too great an accord in the relation of the 
nodes to the septa. Cast. 
pI ois ACLOLEPAS: SD. UNE. iid) .o vis labels ieatte BRO ak eleicoe Oh eh hak Ghee Re 
Lateral view of cast. 
Big; G—Alerennceras cl. \Clouet, DOthande.: 3 )s.0).vchacbhsie 8.40» 4/4 0 L\e Gis nal aletduel aber eae 
Siphuncle of the only specimen. 
BPN COOP ITS 10) SDS MPEIOR © 5 de eins! ou pepe eyevsvabiba ley eioua hele. bin\ ane tedey sie te lleetahots iteteeks 
The only specimen in the collection. 
Pigs. 8. and\o—-dscoceras Doredle, Sb. 20d: ..) is vieielebossiginreceis ole sieresie eee 03a oem mele 
Fig. 8, Dorsal view of the only specimen. Cast. 
Fig. 9, Lateral view of the only specimen. Cast. 
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