PLATE LI. 
igs; = Sto 3o | CAMEROCERAS) PROTEIHOR ME, Sallie tec ccem cee ie settee teenie 717 
(See also plates LVIII, LIX, LX, LXI, LXII.) 
1 The exterior of a sipho, showing the short septal funnels. 
2 The same specimen longitudinally sectioned and showing one, and traces of a 
second siphonal sheath. 
3 Portion of a larger siphon; showing nore distinctly the septal funnels. Trenton 
limestone, Cannon Falls, Minn. 
Fig. 4. \CAMBROCERIAS, 'SP?. Vays cio cists «soi 555 ais iejaieivipte pie \o\eve srein/0/e/a¥e '/ais,o teveisinl sista fefetsts tora tmisiseete ia eieistis ates 777 
4 A specimen whose specific relations are uncertain, having a narrow, cylindrical 
sipho and relatively short septal funnels. Cannon Falls, Minn. 
ME ZSS 5+ GO), TiC AMR OCH RAS SD rere ic nyclors Sn sciatea Zora orayevek wlisiayapa acu nisi’ ee¥e te ara tava ale rstevere eel sve erat the avers etch inlets 780 
5and 6 Two views of a subtriangular sipho with broad septal funnels. Its specific rela- 
tions are not known. 
7 Outline section of the same. From the Trenton limestone, Zumbrota, Minn. 
