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AUG. F. FOERSTE 
cal ribs is somewhere near 32 ; about 4 camerae appear to occupy 
a length equal to the diameter of the conch at the top of the 
series of camerae being counted, but Holtedahl states that the 
distance between the septa is one-fifth of the diameter of the 
shell. The vertical section of the lower end of the specimen, 
as figured by Holtedahl, indicates that the segments of the siph- 
uncle are almost globular, that the diameter of the siphuncle 
equals almost one-fourth of that of the conch, and that its center 
is about one-third of the diameter of the conch from its ventral 
wall. In describing the ornamentation on the surface of the 
shell Holtedahl states that the ‘ Tongitudinal ridges, though not 
much elevated, have a rather sharp section. In some places 
there seems to be present a faint ridge in the middle of the inter- 
val between the ridges and possibly an indication of other, 
extremely faint ones.’’ 
Locality and Horizon. — From the Antarctic Mountain area 
in the southern part of Bear Island. From the Tetradium 
limestone at the top of the Heclahook system. This limestone 
is regarded as of Black River age. In the Riksmuseet, Stock- 
holm, Sweden. 
Remarks. — At least two undoubted specimens of Kionoceras 
occur in strata below the Richmond in American areas, namely 
Kionoceras kentlandense from the Black River area in north- 
western Indiana and a lower Trenton form from New York 
described by Hall under Orthoceras laqueatum ? var. a. Three 
other species, typical Orthoceras laqueatum from the Beekman- 
town of New York, a similar species from the Leray at Pauquette 
Rapids, Canada, and the specimen here described as Kionoceras 
trentonense from the middle Trenton at Middleville, New York, 
may belong to the vertically striated forms from which Kionoceras 
originated. Foord refers to Orthoceras laqueatum some imper- 
fectly preserved specimens from the Trenton at Montmorenci 
Falls, near Quebec, Canada which show ^Traces of what would 
appear to have been longitudinal ridges.” It is cited also from 
the Trenton at Frobisher Bay, on Baffin Land. 
